A car audio amplifier allows you to play music louder in your car audio system. Here are a few tips to take into consideration before buying one.If you want to blast those speakers of your car audio system, you will need to install a car audio amplifier. Basically, an amplifier picks up a sound signal from a source and increases it, resulting in the sound getting louder. The difficult part is ampl
This electronic circuit is a RF Power Amplifier for driving small UHF TV transmitters. Its gain is 7dB and can amplify a signal between 450-800 MHz. You can drive the circuit with 1 to 1,5 Watts signal. Better use double layer PCB with the second layer connected to earth. Use a stabilized power supply 25 volts and at least 5Amps.The transistor case is the SOT-122A and be careful because the transi
A number of companies now have tried going down the compact-design route when it comes to amplifier construction. Companies such as Alpine, Pioneer, and even Kicker have their versions of compact amplification design.As technology progresses, things get smaller. It’s the nature of the beast, and there’s nothing stopping the industry from continuing on this development. JVC’s 2008 Arsenal amp
High gain MOSFET transistors and systematic use of state-of-the-art manufacturing methods, have helped us to find effective solutions for the design of this new equipment. The amplifier, of simple and rugged construction, is able to satisfy the requests of all those end-users looking for top-quality equipment at reasonable prices. The RF power input is divided by 4 by means of a power splitter and
Wireless 5.8GHz Speaker Amplifier Rear Channel Digital Audio Link for Surround SpeakersBy Shoptronics
Buy new: $119.952 used and new from $45.00 Customer Rating: First tagged “samsung” by tuamega Customer tags: wireless surround [...]
Wireless 5.8GHz Speaker Amplifier Rear Channel Digital Audio Link for Surround SpeakersBy Shoptronics
Buy new: $99.99$119.952 used and new from $45.00 Customer Rating: First tagged “home theater” by tuamega Customer tags: wireless [...]
This wide band signal amplifier circuit which is suitable for the frequencies between 10MHz and 500MHz. It will amplify your radio and TV signal, from band I - Band III, and a little Band IV.Wide band RF amplifiers are used in communication receivers, RF measuring equipment and tons of other devices. The circuit described here uses a state of the art transistor to get maximum performance at high
This RF Power Amplifier is a broadband power amplifier operating over the frequency range 88 - 108 MHz and using the new STMicroelectronics RF MOSFET transistor SD2932. Typical Acheivable Performances Device 1 X SD2932, Frequency 88-108 MHz, Vdd 50 V, Idq 200 mAPout 300 W, Gain >19 dB, Input Return Loss 70%Power Amplifier Design: (Datasheet)1. Input Matching NetworkTypical input gate to gate impe
Almost all receivers have a built-in level controls which are adjusted by their manufacturer to give the correct output level for a standard satellite input signal. In some cases this control can be advanced far enough to lift ATV signals to the same output level but most receivers will need this design adding to assist them. There is a penalty to pay for winding an amplifiers gain up, given
TV Linear Power Amplifier for 470-860 MHz taken from Philips Aplication Note (AN_BLW32_33). Please download file in PDF format.The Wide-Band UHF Power Amplifier for TV Transposer band IV/V designed with transistor BLW32 and BLW33. In this case, my RF Amplifier design replaced them with 2 pieces BLW34 have good result.For combine two BLW34 download file here
The TV amplifier has been tuned under class-A small-signal conditions and characterised under large signal class-AB conditions from band IV - V in UHF. (All Datasheets)Amplifier Circuit The total description of the amplifier is given in Figs 6 and 7 and Table 8 (in datasheet). The amplifiers input and output matching networks contain mixed microstrip-lumped elements networks to transform the termi
A broadband linear power amplifier design is presented, suitable for application in TV transposers operating in band IV and V (470 to 860 MHz). The design is based on two BLV859 bipolar transistorscombined with quadrature hybrids. Typical results at the recommended class-A bias point (25.5 V/9.1 A) for the total module include 40 W peak sync output power at -54 dB three tone IMD level (fvision = -
A broadband RF power amplifier design is presented, suitable for application in TV transposers, operating in UHF band IV and V(470 - 860) MHz, with simple printed circuit board.The Rf power amplifier design is based on a BLW898 bipolar transistor. Typical results at the recommended class-A biaspoint (25 V/1.1 A) for the total module include a 3-tone IMD level of -64 dB (fvision = -8 dB, fsideband
This RF power amplifier works in frequency 470 - 860 MHz UHF Band IV and V with power out 14 Watts with input power 1.5 Watts. The power amplifier is suitable for amplifying rf signal your tv transmitter with 0.5 - 2 watts power output.SchematicRF power amplifier circuit is taken from Philips transistor application note, as you can see below.Part Lists:C1 = C6 = C16 = 4,7 pF (500 V) multilayer c
This RF power amplifier module is a product of Philips Semiconductor, hybrid amplifier module CATV systems operating over frequency range of 40-860 MHz at a voltage supply of 24V DC with features :· Excellent linearity· Extremely low noise· Silicon nitride passivation· Rugged construction· Gold metallization ensures excellent reliability.This BGX881 CATV Module can also be used to amplify yo
This RF power amplifier application works on UHF band frequency 440 Mhz and uses as UHF repeater power amplifier. Power amplifier out 30 watts (5 dB gain) use a single transistor 2SD1434.For driving the amplifier use 10-14 watt input with output power range 30-45 watts. Please see datasheet sample design for 470 MHz (SD1434.pdf) and Amplifier Application produced by Hamtronics.Other use of the pow
The following single-stage transistor linear amplifier posseses a gain of approximately 7 dB and an output power of 1 W in the 13 cm band (approx. 2.4 GHz). It is thus suitable for use, for instance, together with the 13 cm transmit converter. This hybrid power mixer equipped with a varactor diode type BXY. This mean that the described 2.4 GHz power amplifier can provide linear output power in the
This application circuit is a TV RF amplifier for driving small UHF TV transmitters, with gain is 7dB and can amplify a signal between 470-860 MHz. Drive input the circuit with 1 to 1,5 Watts signal. Better use double layer PCB with the second layer connected to earth.Use a stabilized power supply 24 volts and at least 5 Amps. The transistor case is the SOT-122A and be careful because the transis
This RF amplifier is to strengthen a small signal in the region of VHF or FM, or it is we lead a body, or a receptor. The preamplifier that to you we propose offers 20dB in all the region of VHF and it still can reach also their 500MHZ.The amplifier is a circuit of high frequency RF with distinguishable materials. The amplifier as circuit strengthens the tendency of signal with concrete aid, depen
This innovative dsPIC30F2020-based project showcases an interesting approach for reducing speaker distortion and increasing bass response. A dual-coil speaker driver is implemented in the design, but only one of the coils is connected to the power amplifier. The other coil is used for electromotive feedback.
This is not a new idea, but many do not implement [...]
IntroductionThe circuit in Figure 1 transmits 200MHz (-3dB bandwidth) video signals while stripping off the sync pulse and performing DC restoration. It is configured for a typical video cable driver application driving a double-terminated 75Ω load, where the EL8102 (IC3) is configured for a gain of +2 to ensure unity gain throughout.Sync StrippingIn component video systems it is frequently nece
This UHF wideband signal amplifier has a total gain of 10 to 15 dB in the 400 - 850 MHz domain frequency so it can be used where the tv signal is weak. For UHF TV signal amplifier to work correctly, you need to cut the components pins as short as possible. C1, C2, C6, C7 are SMD type (surface mounted). This antenna tv amplifier or uhf wideband amplifier need to be build inside of a metal box an
This RF Power Amplifier is used for boosting small fm transmiters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any power amplifier with BGY133 or BLY87 and so on. Its power supply has to give 500mA current at 12 Volts.More voltage can boost the distance but the transistors will be burned much earlier than usual.! In any case do not exceed the 15Vol
Kustom have been kicking out little entry level practice amps for quite some time now. The KBA10 and KGA10 have become the staple diet of beginners across the country, being supplied in Encore Playnow packs and being available for as little as £49.99.
The KBA10 of the Kustom X series is Kustom’s entry level bass amplifier [...]
This circuit is designed to work at UHF frequencies in the range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV signals. This RF amplifier use transistor MPSH10 with 9 volt power supply.The MPSH10 transistor used is available from Maplin Electronics order code CR01B. Alternatives that may be used instead are BF180 and BCY90. The tuned circuit comprising the 15nH indu
Audio Video Distribution amplifierWith the amount of equipment in home entertainment centers today the need to be able to vary the gain of the audio or video signal is needed.I found this particular circuit helpful when used in conjunction with the Universal Descrambler and a Stabilizer circuit I built for making copies of video tapes. It not only allowed me the ability to fine tune the video stre
The SST11LP12 is a high-power, high-gain power amplifier based on the highly-reliable InGaP/ GaAs HBT technology. The SST11LP12 can be easily configured for high-power, high-efficiency applications with superb power-added efficiency while operating over the entire 802.11a frequency band for U.S., European, and Japanese markets (4.9-5.8GHz). It typically provides 35 dB gain with 16% poweradded effi
This application use a common NPN RF transistor called 2SC1970. You can also use other transistors like 2N4427 and some others. Check datasheets to se how much power the transistor can handle. 2SC1970 will handle 1.3W and 2SC1971 up to 6W. Most transistor has a power gain of 10dB meaning 10 times power amplification.This is the reason why you must use several stages to achieve a strong transmitte
PARTS AND MATERIALS Operational amplifier, model 1458 or 353 recommended (Radio Shack catalog # 276-038 and 900-6298, respectively)Three 6 volt batteriesTwo 10 kΩ potentiometers, linear taper (Radio Shack catalog # 271-1715) CROSS-REFERENCES Lessons In Electric Circuits, Volume 3, chapter 8: "Operational Amplifiers" LEARNING OBJECTIVES How to use an op-amp as a single-ended amplifierUsing divided, negative feedback SCHEMATIC DIAGRAM ILLUSTRATION INSTRUCTIONS This circuit differs from the voltage follower in only one respect: output voltage is "fed back" to the inverting (-) input through a voltage-dividing potentiometer rather than being directly connected. With only a fraction of the output voltage fed back to the inverting input, the op-amp will
PARTS AND MATERIALS Four 6 volt batteriesDual operational amplifier, model TL082 recommended (Radio Shack catalog # 276-1715)One NPN power transistor in a TO-220 package -- (Radio Shack catalog # 276-2020 or equivalent)One PNP power transistor in a TO-220 package -- (Radio Shack catalog # 276-2027 or equivalent)One 1N914 switching diode (Radio Shack catalog # 276-1620)One capacitor, 47 µF electrolytic, 35 WVDC (Radio Shack catalog # 272-1015 or equivalent)Two capacitors, 0.22 µF, non-polarized (Radio Shack catalog # 272-1070)One 10 kΩ potentiometer, linear taper (Radio Shack catalog # 271-1715) Be sure to use an op-amp that has a high slew rate. Avoid the LM741 or LM1458 for this reason. The closer matched the two transistors are, the better. If possible, try to obtain TIP41
DAC4800A Ultra Linear Stereo Power AmplifierBy Digital Amplifier Company
3 utilised and new from $2,799.00 Customer Rating: First tagged “rock” by Loud Speaker “Royal-T” Customer tags: dali(2), amp(2), clean sound, diana krall, [...]
The Stagg 10 GA is definitely one of the lowest priced guitar amps in the history of the universe, selling for as little as £24.99.
At this price you’d be right to be wary (I know I was), you’d need to ask questions like; ‘is it made from old beer cans?’ and ‘will it not sound [...]
CMoy is a very simple and portable headphone amplifier. The amplifier was originally posted by Chu Moy on headwize.com. Headphones amplifiers are usually used when the output of a device is to low for the kind of headphones you’re using, or to get better sound quality by keeping the device on a medium volume setting [...]
With the amount of equipment in home entertainment centers today the need to be able to vary the gain of the audio or video signal is needed. I found this particular circuit helpful when used in conjunction with the Universal Descrambler and a Stabilizer circuit I built for making copies of video tapes. It not only allowed me the ability to fine tune the video strength it also helped me increase the recorded audio which typically becomes poor when making tape copies.This circuit is an audio video distribution amplifier that splits to other channel for audio and video. Circuit operation is straight forward for amplifier circuits. The second channel for the audio amplifier is made up of the same components except the other half of IC1 is used. Pin 6 & 5 are inputs and 7 is the output.
SAN DIEGO–(BUSINESS WIRE)–In pursuit of providing the highest sound quality and in-vehicle listening experience, Pioneer Electronics (USA) Inc. today released its Premier PRS-A900 4-channel reference amplifier and, in turn, redefines “state-of-the-art” with regard to [...]
The schematic show you a RF amplifier with very high gain. The feeding RF signal enter C9 to transistor Q1 which has a self biased working point. The gain and working point is set with the two resistors R1 and R2. FB1, C5, C6 works as filter for rejecting RF to power line. Q1 has a gain about 15dBm. The output signal can be found a the collector which then enter a second amplifier stage Q2. This stage also has a self biased working point. The gain is set by the resistors R3//R4 and R5//R6.Why do I have 2 parallel resistors like that?It is because I want to be able to change the gain of the amplifier. On the PCB below you will see that I only have 2 pads for the resistors. When I want to resistors I solder the two resistors R5 and R6 on top of each other and the same with R3 and R4.I advice
An RF power amplifier is a type of electronic amplifier used to convert a low-power radio-frequency signal into a larger signal of significant power, typically for driving the antenna of a transmitter. It is usually optimized to have high efficiency, high P1dB compression, good return loss on the input and output, good gain, and good heat dissipation.Wideband amplifier designtransformations over large bandwidth are difficult to realize, thus most wideband amplifiers use 50 Ω output loading. Transistor output power is then limited toVbr is defined as the breakdown voltageVk is defined as the knee voltage and
Used Laney HC50B bass amplifier for sale!- Made in UK- 50 watts- Mint condition- 12 inch HH Hardcore speaker- DI out- Compressor- Discontinued modelRM1500Please call 012-2934464 or email afiqme[at]afiqme.comDon't miss out Afiqme's latest news & articles, subscribe to this blog today.
The new $2399.99 Marantz MM8003 eight channel power amplifier is the perfect complement to AV8003 pre-amplifier/processor. This amplifier is equipped both balanced XLR and unbalanced RCA input jacks as well as gold-plated speaker connectors, and with 140W per channel, it can easily drive a complete 7.1-channel speaker system. Remote control input and output jacks allow external component control along with output channel relay on/off and slow start to power-on mode.
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It has been unveiled at CES, but now the forthcoming AV8003 A/V receiver appeared on Marantz's official website with a $2599.99 price tag. Equipped with all of the latest technology, the receiver features 7.1-channel Dolby TrueHD, DTS-HD Master Audio decoding and THX Ultra2 certification. It includes HDMI v1.3a inputs, built-in video processor with de-interlacing and 1080p upconversion, Deep Color support, xvYCC extended video formats, and there is also audio/video multi-room capability up to three zones.
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This Power Amplifier application works on UHF band frequency 440 Mhz and uses as UHF repeater power amplifier. Power amplifier out 30 watts (5 dB gain) use a single transistor 2SD1434 For driving the amplifier use 10-14 watt input with output power range 30-45 watts. Please see datasheet sample design for 470 MHz (SD1434.pdf) and Amplifier Application produced by Hamtronics.Other use of the power amplifier is for online covering broadcast (STL). If you use stereo encoder on exciter, so please use down converter with 340 MHz oscillator frequency direct to FM broadcast receiver.
This is uber cool. I always thought those huge Tape-recorders beholded by hip-hop loose pant guys is so thing of the past. These are amazingly designed bags implanted with speakers and amplifiers to blow the mind of onlookers. They are available in matt and golden finish. It not only looks jazzy but also smart and trendy at the same time. News say that the Fi-Hi presented its novelty bags equipped with speakers and amplifier during CTIA Wireless 2008 recently.
The schematic show you a RF amplifier with very high gain. The feeding RF signal enter C9 to transistor Q1 which has a self biased working point. The gain and working point is set with the two resistors R1 and R2. FB1, C5, C6 works as filter for rejecting RF to power line. Q1 has a gain about 15dBm. The output signal can be found a the collector which then enter a second amplifier stage Q2. This stage also has a self biased working point.The gain is set by the resistors R3//R4 and R5//R6.Why do I have 2 parallel resistors like that?It is because I want to be able to change the gain of the amplifier. On the PCB below you will see that I only have 2 pads for the resistors. When I want to resistors I solder the two resistors R5 and R6 on top of each other and the same with R3 and R4.I advice
DescriptionThis CATV amplifier module is a product of Philips Semiconductor, hybrid amplifier module CATV systems operating over frequency range of 40-860 MHz at a voltage supply of 24V DC with features :· Excellent linearity· Extremely low noise· Silicon nitride passivation· Rugged construction· Gold metallization ensures excellent reliability.This CATV Module can be used to amplify your CATV Modulator for 13 dB. And in my technical experiences in tv transmitter it can not only used on cable media, but also it can be used on air via a suitable antenna. With Adding a TV low pass filter you are able to transmit your video for 1 km.CircuitComponentsC1, C3, C4 ceramic multilayer capacitor 1nFC2 ceramic multilayer capacitor 1nF(max)R resistor 200 Ohm 1WPin
The OP07 is in a non inverting amplifier so as not load the mV of thermocouple, the zeners are to protect circuit if junction contacts heaters or the earth gets broken. The RC is to filter out 50Hz pick up in thermocouple wires if near heater wiring and..글 전체보기
The following single-stage transistor linear amplifier possesses a gain of approximately 7 dB and an output power of 1 W in the 13 cm band (approx. 2.4 GHz). It is thus suitable for use, for instance, together with the 13 cm transmit converter. This hybrid power mixer equipped with a varactor diode type BXY. This mean that the described power amplifier can provide linear output power in the order of 1 W.CIRCUIT DESCRIPTIONA transistor type F1E6 manufactured by CTC is used. In this case of this transistor, the emitter is internally connected to the cooling bolt. This ensures that there are no problems with respect to the high-frequency grounding of the emitter. The circuit diagram of this amplifier is given in figure 1. The matching of the transistor input and ouput impedance to 50 Ohm is
This FM amplifier is originally designed by Broadcast Warehouse, based transistor SD1407 with redrawn schematic and redesigned pcb. You can drive the amplifier with maximum 1 watt input for 150 watts FM output.Working frequency 88-108 MHz VHF band II, Power supply voltage 18-28 VDC.Download : schematic, PCB all layer, top layer, bottom layer. More info ...
A broadband linear amplifier design is presented, suitable for application in TV transposers, operating in band IV and V(470 - 860) MHz. The design is based on a BLW898 bipolar transistor. Typical results at the recommended class-A biaspoint (25 V/1.1 A) for the total module include a 3-tone IMD level of -64 dB (fvision = -8 dB, fsideband = -16 dB and fsound = -10 dB) and an average gain of 10.5 dB at 3 W peak-sync output power in the (470 - 860) MHz frequencyrange.The BLW898 is a bipolar linear power transistor designed to operate in the (470 - 860) MHz range. The transistor isencapsulated in a SOT171A 6-lead rectangular flange package with a ceramic cap. The specified output power is 3 W peak-sync in class-A. The intermodulation distortion level (IMD) < -63 dB (fvision = -8 dB, fsideband
The Bazooka ELA100.2 is arguably one of the most popular entry-level amplifiers available on the market today. First debuting in mid 2007, the ELA100.2 has become the backbone of Bazooka's affordable high-performance amplifier series.The ELA100.2 is solid performing with 115 watts through 2 channels at 4 ohms, 165 watts through 2 channels at 2 ohms, and 330 watts through bridged single channel at 4 ohms. It also features tri-mode capable outputs, allowing you to connect speakers in stereo mode and an additional subwoofer in mono. It could even be daisy-chained to any other compatible Bazooka audio component such as a Class D amplifier or a Bazooka amplified bass tube.This 2-channel amplifier is protected by its built-in thermal, short circuit, and overload protection circuitry. If you're w
FM amplifier is used for amplify signal from exciter in broadcast radio station. In this page, RF FM Amplifier uses solid state material with minimum gain 9dB. Input FM Amplifier needs 5-10 watt with power output about 100 watt. The Block schematic and datasheet
RF Amplifier for 470-860 MHz taken from Philips Aplication Note (AN_BLW32_33). Please download file in PDF format.The Wide-Band UHF Power Amplifier for TV Transposer band IV/V designed with transistor BLW32 and BLW33. In this case, my RF Amplifier design replaced them with 2 pieces BLW34 have good result. For combine two BLW34 download file here
The TV amplifier has been tuned under class-A small-signal conditions and characterised under large signal class-AB conditions from 470 - 860 MHz. (All Datasheets)Schematic Circuit AmplifierThe total description of the amplifier is given in Figs 6 and 7 and Table 8 (in datasheet). The amplifiers input and output matching networks contain mixed microstrip-lumped elements networks to transform the terminal impedance levels to approx. 25 W balanced. The remaining transformation to 50 W unbalanced is obtained by 1 : 2 balun transformers. The baluns B1 and B2 are 25 W semi-rigid coax cables with an electrical length of 45° at midband and a diameter of 1.8 mm, soldered over the whole length on top of microstrip lines. To keep the circuit in balance two stubs L1 and L8 with the same length have
This circuit protector is so simple, but it has big function in protecting your rf amplifier device. The input part signals for protecting are :Termo Switch (Heat Sensor Resistance) from your active component, RF Power transistor/FET.Forward and Reflect (reverse) from your directional coupler after your Low Pass Filter Output.Over Drive from directional coupler at the input of your rf amplifier to limit power input in normal condition.Relay (12v DC) for disconnecting power supply of your RF amplifier if condition for protecting happened.Attention :Do it manually before you install it in real condition. Don't forget to adjust 50K resistor for every input parts.
The Tone of a Vintage Vox, Right in Your Headphones! The Vox amPlug AC30 headphone guitar amplifier plugs straight into your guitar's output jack! You get the unmistakable vibe of a classic Vox AC30 amp from the amPlug AC30; just plug this micro tonemeister in and hear the chiming sound of the British Invasion in your headphones. Using two gain stages, the amPlug AC30 is able to emulate the vintage vibe of the legendary amp, while giving you the portability and convenience to take it anywhere. Now you can enjoy incredible guitar tone wherever you want with the amPlug AC30 headphone amp!Vox amPlug AC30 Headphone Gutar Amplifier at a Glance: Amazing tone in a tiny package Analog circuitry, tube tone Get great tone anywhere Amazing tone in a tiny package amPlug is a headphone gu
A broadband linear amplifier design is presented, suitable for application in TV transposers operating in band IV and V (470 to 860 MHz). The design is based on two BLV859 bipolar transistorscombined with quadrature hybrids. Typical results at the recommended class-A bias point (25.5 V/9.1 A) for the total module include 40 W peak sync output power at -54 dB three tone IMD level (fvision = -8 dB, fsound = -10 dB, fsideband = -16 dB) and an average gain of 10.5 dB in the (470 to 860) MHz range.The BLV859 is a bipolar linear push-pull power transistor designed to operate in the 460 to 860 MHz range. With a specified output power of 20 W peak-sync in class-A it is the largest device in the new generation of transposer transistors. The intermodulation distortion level is < -54 dB (fvision = -8
The TV amplifier has been tuned under class-A small-signal conditions and characterised under large signal class-AB conditions from band IV - V in UHF. (All Datasheets)Amplifier Circuit The total description of the amplifier is given in Figs 6 and 7 and Table 8 (in datasheet). The amplifiers input and output matching networks contain mixed microstrip-lumped elements networks to transform the terminal impedance levels to approx. 25 W balanced. The remaining transformation to 50 W unbalanced is obtained by 1 : 2 balun transformers. The baluns B1 and B2 are 25 W semi-rigid coax cables with an electrical length of 45° at midband and a diameter of 1.8 mm, soldered over the whole length on top of microstrip lines. To keep the circuit in balance two stubs L1 and L8 with the same length have been
Here is a simple audio amplifier using a TL431 shunt regulator. The amplifier will provide room-filling volume from an ordinary crystal radio outfitted with a long-wire antenna and good ground. The circuitry is similar in complexity to a simple one-transistor radio but the performance is superior (with the exception of the [...]
In the below circuit is a versatile audio amplifier employing a low cost LM358 op-amp. The differential inputs give the amplifier excellent immunity to common-mode signals which are a common cause of amplifier instability. The dotted ground connection represents the wiring in a typical project illustrating how the ground sensing input [...]
The circuit below shows a 4-transistor utility amplifier suitable for a variety of projects including receivers, intercoms, microphones, telephone pick-up coils, and general audio monitoring. The amplifier has a power isolation circuit and bandwidth limiting to reduce oscillations and “motorboating”. The values are not particularly critical and modest deviations from the [...]
This circuit protector is so simple, but it has big function in protecting your rf amplifier device. The input part signals for protecting are :Termo Switch (Heat Sensor Resistance) from your active component, RF Power transistor/FET.Forward and Reflect (reverse) from your directional coupler after your Low Pass Filter Output.Over Drive from directional coupler at the input of your rf amplifier to limit power input in normal condition.Relay (12v DC) for disconnecting power supply of your RF amplifier if condition for protecting happened.Attention :Do it manually before you install it in real condition. Don't forget to adjust 50K resistor for every input parts.
This simple amplifier shows the LM386 in a high-gain configuration (A = 200). For a maximum gain of only 20, leave out the 10 uF connected from pin 1 to pin 8. Maximum gains between 20 and 200 may be realized by adding a selected resistor in series with the same 10 [...]
FM amplifier is used for amplify signal from exciter in broadcast radio station. In this page, RF FM Amplifier uses solid state material with minimum gain 9dB. Input FM Amplifier needs 5-10 watt with power output about 100 watt. The Block schematic and datasheet
TV Linear Power Amplifier for 470-860 MHz taken from Philips Aplication Note (AN_BLW32_33). Please download file in PDF format.The Wide-Band UHF Power Amplifier for TV Transposer band IV/V designed with transistor BLW32 and BLW33. In this case, my RF Amplifier design replaced them with 2 pieces BLW34 have good result. For combine two BLW34 download file here
2.45 GHz power amplifier with the BFG480W At a frequency of 2.45 GHz, a supply voltage of 3.0 V, and a control voltage of 3.0 V, the amplifier delivers an output power of 19 dBm at an input power of 8 dBm, with a power added efficiency of 38 %, pdf fileSource : http://www.educypedia.be/electronics/antennawifi.htm
2.4 GHz low noise amplifier with the BFG480W This application note gives an example of a 2.4 GHz LNA with the BFG480W. Because this LNA design has a high third order intercept value of 17 dBm (measured at input), it can be used for Wireless Local Area Network (WLAN) front-end and Wireless Local Loop (WLL) applications, pdf fileSoruce : http://www.educypedia.be/electronics/antennawifi.htm
The answer lies in the fact that the transistor used in the single-stage CE amplifier is *biased*; that is, DC levels are established (using resistors) so that the base-emitter junction is always forward biased and the collector-base junction is always reverse biased. The AC signal is then capacitively coupled into the base. This causes a large AC current to flow from the collector to the emitter in accordance with basic bipolar transistor theory and the output is taken from the collector. The AC gain is given by the formula Av = KRc ; where K is a constant (easily determined) and Rc is the value of the collector resistor.
The answer lies in the fact that the transistor used in the single-stage CE amplifier is *biased*; that is, DC levels are established (using resistors) so that the base-emitter junction is always forward biased and the collector-base junction is always reverse biased. The AC signal is then capacitively coupled into the base. This causes a large AC current to flow from the collector to the emitter in accordance with basic bipolar transistor theory and the output is taken from the collector. The AC gain is given by the formula Av = KRc ; where K is a constant (easily determined) and Rc is the value of the collector resistor.
The 22 watt audio amplifier is an easy to build project, very inexpensive. The circuit can be used to boost the signal from a car audio system, home speaker system or as an amplifier for computer speakers. These are just a few practical applications, but it can be adapted to your personal needs. The circuit is compact and uses only about 55 watts; it dissipates roughly 28 watts of heat, so a heatsink is necessary. It operates at 12 Volts at about 5 Amps at full volume. Lower volumes use less current, and therefore produce less heat. The chip should run cool enough to touch with the proper heatsink installed. The parts can be found at any electronics store, making it a great DIY project for beginners.
Parts List:
R1: 39K 1/4 Watt Resistor
C1,C2: 10uf 25V Electrolytic Capacitor
C3: 100uf 25V Electrolytic Capacitor
C4: 47uf 25V Electrolytic Capacitor
C5: 0.1uf 25V Ceramic Capacitor
C6: 2200uf 25V Electrolytic Capacitor
U1: TDA1554 Two Channel Audio Amp Chip
MISC: Heatsink for U1,
The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these transistors are used in inverters and smps they are easily available for around Rs: 20/-.
Read More Detial in Source :
http://www.flashwebhost.com/circuit/60_watts_rf_amplifier.php
Thank you.
radio frequency, RF (Radio Frequency), RF AmplifierShare This
This is circuit power amplifier for car. use IC TDA7384.
Output power 34Wx4 at speaker 4OHM.
read intro detail:
So this time I decided to make pretty simple but powerful enough audio amplifier. For this I’ve chosen quad bridge car audio amplifier TDA7384 which has four input and four output channels with power capability 4×35W.
If connect to car battery where operating voltage is about 13.2V, then each channel can give 22W(4Ω) – what is more than enough for me. This amplifier I probably will use to test audio processor TDA7313 which is stil in development phase. I didn’t find much information about this chip on the internet so I decided to built it and try on my own.
As datasheets of TDA7384 says it is low distortion, low output noise, low external component count. Also has Stand-By function and Mute function. It has several protections like from output short circuit to GND or to Vs, capable to handle very inductive loads, thermal limiter, load dump voltage. TDA7384 i
This amplifier is based on the transistor 2SC1970 and 2N4427.
The output power is about 1.3W and the input driving power is 30-50mW.
You can use other transistor as 2SC1971 and get much more output power.
1.3W will still get your RF signal quit far and I advice you to use a good 50 ohm resistor as dummy load.
Make sure it can take up to 5-10W, else it will be a hot resistor.
You MUST use an antenna or 50 ohm dummy resistor while testing else you burn up the transistor.
In all RF system and specially in RF amplifiers, it is very important to have a stable power supply and making sure you won’t get any RF out on the power line. The Capacitor C12 and C13 will stabilise the DC power supply. L1, C10, C11 and L3 with C8, C9 will also prevent RF from leaking out to the powerline and cause oscillation or disturbances. L1 and L3 should be ferrite chokes or inductance’s about 1 to 10 uH.
Transistor Q1 will act as a buffer amplifier, because I don’t want to load the
While a USB keyboard may do the ivory-ticklers in the crowd some good, Crate is looking out for the six-string warriors by shipping its USB-equipped Profiler 5 mini amplifier. This five-watt combo guitar amp measures in at less than eight-inches tall and weighs just six-pounds, and aside from giving users the option of powering it via an AC adapter or six AA cells, there's also an auxiliary input for rocking along with your DAP. More important, however, is the rear-mounted USB port (shown after the jump), which enables guitarists to easily record their shredding without any external breakout boxes. So if you think you can give the twin four-inch speakers in Crate's latest all they can handle, the Profiler 5 is available now for $159.99.Continue reading Crate ships USB-equipped Profiler 5 mini guitar amplifier(Via Engadget.)
The picture above shows a circuit board layout giving every option that the MOSFET amplifier will use. This board could be built very easily using “Manhattan Construction” or “dead bug” style construction. I have also built it on mass produced prototype boards from Tanner Electronics. Radio Shack and others have similar prototype boards that can be used. Lay out the parts exactly like they are in the circuit diagram.
Build 13 of these and this receiver is almost built. Just add the oscillators (BFO, VFO, and 4MHz), the product detector, the AGC circuit, the audio amplifier, the three filters (TV & FM, Bandpass & crystal), and you are done. These circuits are just as easy or easier to build than the MOSFET circuit.
I have built the MOSFETs “dead bug” style on 2″ by 2″ copper squares with an assembly line like procedure, and finished all 13 in one evening. Trying to put them on a 1″ by 1″ copper square “
This amplifier does not have AGC applied. Two 100K resistors are used to set the gate 2 bias at approximately six volts, bypassed with a .01 decoupling capacitor.
This amplifier may have a tendency to oscillate, if so, detune the 455 kHz IF can or add a resistor of 2.2K to 12K across the primary of the coil (between the drain and B+). A 12K resistor is shown in the schematic. Adjust S-meter responsiveness by tuning the output coil.
The LEDs in the IF strip will show the AGC action. Since the LEDs are in the drain circuit of the MOSFETs, changes in the drain current will show in the brightness of the LEDs.
For more gain from the IF strip to the Product Detector, take the 100K resistors off Gate 2, and connect the AGC line to Gate 2. Leave the .01 bypass cap on Gate 2.
Move the connection to the product detector from the Second amplifier to the output of this one. The output to the AGC circuit will be as shown in the schematic, without a coupling capacitor. Add a .01 cap at th
The Japanese company, Onkyo has announced a new addition to its Integra series, Onkyo Integra DTX-8.8, the new AV amplifier that features Dolby TrueHD, WRAT (Wide Range Amplifier Technology) and DTS-HD Master Audio, which aimed to enhance your home entertainment experience. Besides, the Integra DTX-8.8 that comes with a power of 7×280W also has four HDMI Ver.1.3a inputs and two HDMI outputs, allowing you to connect to more devices. With its industry standard Silicon Optix chipset, this AV amplifier is able to upscale video to 1080p.The AV amplifier that measures at 435×454.5×194mm and weighs at 24.1kg will hit the market in coming August for about 336,000 yen ($2700).
