Owner: Radio Frequency Circuit URL:http://radiofrequencycircuit.blogspot.com/ Join Date: Fri, 31 Oct 2008 10:30:19 -0500 Rating:0 Site Description: Electronic RF Schematic Circuit for Transmitter, Receiver, Antenna, Transmission line, RF Meter and Measurement Site statistics:Click here
Synthesised WideBand FM Transmitter 2008-07-07 08:29:34 This project is a complete crystal-controlled Wide Band Frequency Modulated (WBFM) transmitter delivering a power output in the order of 10 milli-watts (+10dBm) using simple components. The transmitter is based upon the Phase-Locked Loop (PLL) principle, but due to the circuit's simplicity a true "phase lock" can never be achieved.The transmitter has both 1v peak-to-peak 'LINE' input and 10mV 'MIC Read more:Transmitter
250mW FM Power Amplifier 2008-07-07 08:10:29 This project is a simple 2-transistor VHF power amplifier, with about 16dB gain, and requires no tuning or alignment procedures. Wideband techniques have been used in the design and the circuit is equipped with a "lowpass" filter to ensure good output spectral purity. The project has been designed for assembly on a single-sided printed circuit board. The circuit is specifically designed to amplify Read more:Amplifier
1W AM Transmitter 2008-07-07 07:49:30 This AM transmitter circuit provides a nice, clean output of about 1 Watt (carrier power). Though designed for the medium wave band (circa 1.5 MHz) it would work equally well on higher frequencies (6.2 MHz for example) with a few tweaks in component values (see table on left - C15 should be adjusted for maximum output).The carrier (produced by the 4049) is modulated at low-level by the MC1496 bala Read more:Transmitter
2.5 W FM Power Amplifier 2008-07-07 07:46:14 This rf power amplifier design for a 2.5 Watt power amplifier for the FM band. An input of 50 mW gives a final output power of 2.5 Watts with a 13 Volt supply. The best bit is that the amplifier requires no tuning once it's built - it gives roughly the same gain and output power right across the FM band from 88 to 108 MHz.There's even some hefty output low pass filtering to make sure that harmoni Read more:Amplifier
, Power Amplifier
88-108 MHz PLL FM Synthesizer 2008-07-07 07:38:06 This fm synthesizer circuit is played with and optimised design for an 88-108 MHz synthesiser, programmable in 25 kHz steps. It produces about 50 mW output (and thus feeds nicely into the amplifier shown below) with no tuning required other than to set the inputs of the divide-by-N counter to the wanted frequency.FM modulation is achieved just by injecting audio on the audio input (audio response
Audio Processor for AM Transmitter 2008-07-07 07:32:12 This audio circuit is used for AM transmitter audio procesing. It equipped with low pass filter circuit for AM spectrum. It's easy for use.MK1 AM Audio
ProcessorMy first attempt at an improved audio processor for GCR using a Plessey SL-6270 VOGAD (VOice controlled Gain Adjusting Device) which is designed more for PMR use than broadcast use but with the right parameters does a reasonable job. It d Read more:Transmitter
FM Stereo Encoder 2008-07-07 07:17:02 This Stereo
encoder circuit built with MC1496. It produces a very clean signal with good separation (it performed as well as any other encoder, which included some expensive professional ones) and has been used on many professional commercial radio stations. There's no input filtering on it so it has to be proceeded by a 15 kHz low-pass filter (which was something I put on my processor instead o Read more:Encoder
Stereo FM Transmitter BH1415F 2008-07-01 03:37:02 This Electronic circuit is a stereo FM Transmitter
based on BH1415F wireless audio link IC. Phase Locked Loop (PLL) controller use PIC16F628 and the the PLL frequency programming can be displayed with 8x2 and 16x2 LCD. Frequency Range 88-108 MHzBH1415F can be supplied with 6 - 15V voltage, consumes only around 25mA while providing very sound quality and improved 40dB channel separation. BH1415 is Read more:Stereo
Garage Door Opener Transmitter 2008-07-01 03:00:58 This electronic circuit is the newer and revised version of the garage door opener transmitter. The transmitter is a PIC based on 40 MHz Microchip’s 16F630 microcontroller. A 10 switch DIP-switch is used for setting the code. To save space, we used a different HF output coil. Schematic , PCB files and hex code are available.Download Documentation Datasheet Read more:Garage
, Opener
, Transmitter
Stereo FM Transmitter Based BA1404 Chips 2008-06-29 23:47:05 This electronic circuit design is a stereo FM transmitter that improves sound quality, has very good frequency stability, maximizes transmitter's range, and is fairly simple for everyone to build. We are happy to announce that this goal and expectations have been met and even exceeded.The transmitter can work from a single 1.5V cell battery and provide excellent crystal clear stereo sound. It can Read more:Chips
, Stereo
, Transmitter
VHF/UHF TV Modulator 2008-06-29 23:28:12 The electronic circuit is a TV modulator that is really no more than a transmitter. It is a very small transmitter, admittedly, but none the less that is what it is. What does a modulator actually do? In general -and this design is no exception to the rule - it is a simple oscillator that generates a frequency somewhere in the VHF or UHF region. The oscillator is modulated with the video signal an
Transistor Schmitt Trigger Oscillator 2008-06-29 22:25:44 The Schmitt Trigger oscillator below employs 3 transistors, 6 resistors and a capacitor to generate a square waveform. Pulse waveforms can be generated with an additional diode and resistor (R6). Q1 and Q2 are connected with a common emitter resistor (R1) so that the conduction of one transistor causes the other to turn off. Q3 is controlled by Q2 and provides the squarewave output from the collec
FM Transmitter with 2 Transistor 2008-06-29 13:30:03 This FM ransmitter circuits may be tuned to operated over the range 88-108 MHz. Although only low power this circuit can be transmitted with a range of 20 or 30 metres. It's suitable for use as wireless microphone.This circuit used a pair of BC548 transistors. Although not strictly RF transistors, they still give good results. Use an ECM Mic with a two terminal ECM, but ordinary dynamic mic insert Read more:Transmitter
88-108 MHz Voltage Controlled Oscilator for PLL Controller 2008-06-27 13:12:49 This Circuit will explain the PLL unit and the VCO (Voltage
Controlled Oscillator) which will create the FM modulated RF signal up to 400mW. the schematic to follow my function description. The main oscillator is based around the transistor Q1. This oscillator is called Colpitts oscillator and it is voltage controlled to achieve FM frequency modulation) and PLL control.Q1 should be a HF transistor
88-108 MHz PLL Controller for FM Transmitter 2008-06-27 13:09:15 This circuit will explain the PLL controller unit for the FM transmitter. It is very important since the transmitter frequency is digitally controlled and thereby very stable. The heart of this unit is a PIC processor called PIC16F870, a 2 x 16 char display and four buttons.Circuit SchematicYou will also find a 2 line 16 char display based on " HD44780-based LCD Modules" which is very common. Most Read more:Transmitter
Simple FM transmitter with a Single Transistor 2008-06-15 08:11:03 Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan's beginning steps. When done right, they provide very clear wireless sound transmission through an ordinary FM radio over a remarkable distance. I've seen lots of designs through the years, some of them were so simple, some of them were powerful, some of them were hard to build etc.Here is the last s Read more:Simple
Privacy Policy 2008-06-10 07:16:27 Privacy Policy
for Radio Frequency CircuitIf you require any more information or have any questions about our privacy policy, please feel free to contact us by email at ecircuits@telkom.net.At Radio Frequency Circuit Blog, the privacy of our visitors is of extreme importance to us. This privacy policy document outlines the types of personal information is received and collected by Radio Frequency Read more:Privacy
, Privacy Policy
FM Telephone Transmitter 2008-10-31 12:09:27 The FM telephone circuit is built on a PC board that is so small it can easily be fitted inside the housing of a telephone making it an instant pseudo-speak earphone.
Here's the FM telephone transmitter circuit :
This FM circuit connects in series with telephone line, steals power from it, and transmit at both sides of the conversation to an FM radio tuned between 90 and 95 MHz.
FM Telephone Read more:Transmitter
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