Owner: Circuit Electronics URL:http://circuit-electronic.blogspot.com/ Join Date: Sat, 25 Aug 2007 14:15:24 -0500 Rating:0 Site Description: Circuit electronic, TV circuit, Monitor circuit, Power supply circuit,Digital circuit, Kit circuit Other. Site statistics:Click here
Variable DC Supply 2007-11-09 02:31:00 Another version of variable DC supply using LM317 that uses an LED to show the ON/OFF status of the supply.Read more : http://www.electronics-project-design.com/Variable
DCPowerSupply
.html
Constructing a universal DC Supply 2007-11-09 02:30:00 This is a basic, text-book, variable DC supply voltage regulator circuit using an LM317 from input supply of 7-20 V AC or 7-30V DC . The output voltage can be set to anywhere in the range 1.5V to 30V.Read more : http://www.electronics-project-design.com/UniversalPowerSupply
.html
Simple fixed 5V DC Power Supplies Project 2007-11-09 02:27:00 This project provides the schematic and the parts list needed to construct a simple Supply from an input supply of 7-20 V AC or 7-30V DC. Two DC voltage outputs are available; 5V and variable from 5V upwards.Read more : http://www.electronics-project-design.com/DCPowerSupply.html Read more:Project
, Simple
Variable 5 to 20V DC Supply 2007-11-09 02:25:00 Build your own 5-20V DC power supply using National Semiconductor LM2941 low dropout voltage regulator.Read more : http://www.electronics-project-design.com/voltageregulator.html Read more:Supply
, Variable
Variable 5 to 15V DC Supply 2007-11-09 02:20:00 This is a simple DC regulated supply project using 7805 voltage regulator to obtain a variable DC voltage range from 5V to 15V.Read more : http://www.electronics-project-design.com/RegulatedPowerSupply
.html Read more:Variable
Variable 2 to 25V DC Supply 2007-11-09 02:13:00 This project uses a LM338 adjustable 3 terminal regulator to supply a current of up to 5A over a variable output voltage of 2V to 25V DC.Read more :http://www.electronics-project-design.com/PowerSupply
Schematic.html Read more:Variable
How to buy Motorola Talkabout T9500 2-Way Radio 2007-11-15 21:52:00 The Motorola
® I9550 Camo 25 Mile two-way radio is ready for your long distance communication needs. The unit is iVOX enabled for easy to use, hands-free communication without the need for an audio accessory. The NOAA Weather Alert Radio
provides you... Read full description
Antenna tuning pdf file 2007-11-21 21:20:00 Antenna
tuning pdf fileSource : http://www.educypedia.be/electronics/antennawifi.htm
Antennas for 2.4 GHz WiFi 2007-11-21 21:16:00 Antennas for 2.4 GHz WiFi
wide angle antenna for 2.4 GHz WiFi, sector antenna for 2.4 GHz WiFi, Modified 3D Corner Reflector Feed for SAT TV offset parabolic dish, 2 el. BiQuad Feed for Offset Dish at 2.4 GHz WiFi, Trimmed 3D Corner Reflector Antenna for 2.4 GHz WiFi, antenna for 2.4 GHz WiFi: Easy to build very good antenna for 13 cm amateur band and Wireless LAN Access Points, covering 180 deg, Modified 3D Corner Reflector Antenna for 2.4 GHz WiFi, Corner reflector antenna for 2.4GHzSource : http://www.educypedia.be/electronics/antennawifi.htm
Antennetechniek voor WISPs 2007-11-21 21:15:00 Antennetechniek voor WISPs biquad, cantenne, Biloop antenneSource : http://www.educypedia.be/electronics/antennawifi.htm
Antenna construction 2007-11-21 21:11:00 Antenna construction Quarter wave omnidirectional antenna for 2.4 GHz, omnidirectional antenna, Omnidirectional collinear antenna for 2.4 GHz, Biquad antenna for 2.4 GHz, Biquad antenna as a 2.4 GHz feeder for a Parabolic Dish, Can antenna for 2.4 GHz, pdf fileSource : http://www.educypedia.be/electronics/antennawifi.htm Read more:Antenna
Antenna Basics 2007-11-21 21:09:00 Antenna Basics
1/4 Wavelength Ground Plane, Yagi antenna, horn antenna, Parabolic Dish, focus f = D2/16.c ; D= diameter of the parabola, c is depth of the parabola, BiQuad antenna, pdf fileSource : http://www.educypedia.be/electronics/antennawifi.htm Read more:Antenna
2.4 GHz WLAN Radio Interface 2007-11-20 22:23:00 2.4 GHz WLAN RadioInterface
IEEE 802.11b radio interface, Radio signal propagation at 2.4 GHz, Link budget calculations, pdf fileSource : http://www.educypedia.be/electronics/antennawifi.htm
2.45 GHz power amplifier with the BFG480W 2007-11-20 22:22:00 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 2007-11-20 22:20:00 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
2.4GHz AntennaAlignement 2007-11-20 22:16:00 2.4GHz AntennaAlignement This paper attempts to provide some insight into the nature of radio propagation in that part of the spectrum (upper VHF to microwave) used by experimenters for high-speed digital transmission. It begins with the basics of free space path loss calculations, and then considers the effects of refraction, diffraction and reflections on the path loss of Line of Sight (LOS) linksSource : http://www.educypedia.be/electronics/antennawifi.htm
Self-heated transistor digitizes airflow 2008-03-10 22:39:00 A sensitive and reliable way to measure airflow is to exploit the predictable relationship between airspeed and the heat dissipated by a sensor exposed to the flow while being held at a constant temperature differential above ambient. The power required to maintain the elevated sensor temperature is proportional to the square root of the airspeed (King's law). The popular hot-wire anemometer uses this principle, but suffers from the disadvantage of using a relatively fragile airflow sensor, a thin metallic filament.Link source: : www.next.gr
Transistor and FVCs make linear anemometer 2008-03-10 22:37:00 A previous Design Idea presented a simple flow-to-frequency transducer that easily fits into mP-based measurement systems (Reference 1). You can accumulate and linearize its frequency output by using software without the need for ancillary circuitry. In other applications, however, you might prefer a linearized analog output.Link source : www.next.gr
12-bit converter upgrades µC's ADC 2008-02-13 17:19:00 The simple circuit in Fig 1 and an accompanying software routine let you easily substitute a multichannel 12-bit ADC for the 8-bit ADC internal to the 87C752 µC. A single assembly can then implement both the low- and high-performance version of a system. A socket lets you plug in the external ADC when you need it; otherwise, you plug in the network of 10 100V resistors. At power-up, the µC executes a routine that looks for the external converter
.Source Link : Read more:upgrades
18-bit ADC uses PC's serial port 2008-02-13 17:17:00 A PC usually requires a plug-in ADC card to process analog signals. However, with the circuitry in Figure 1, a PC can communicate with an 18-bit ADC through its serial port. The port provides both positive and negative power supplies as well as control signals. IC1 is an 18-bit MAX132 ADC with a serial interface. It requires three input control signals, , DIN, and SCLK, and emits serial data, DOUT, and EOC (end-of-conversion) signals.Source Link :
2-channel ADC tags its own output 2008-02-13 17:16:00 The circuit in Fig 1 shows a simple way to operate a 1-MHz, 12-bit ADC (IC1) in DMA mode while alternating between its two analog-input channels. The converter operates continuously, driven by the 1-MHz clock on the S/H input. Tying RD and CS low ensures that data are always present on the ADC's output bus. The outputs of the 74HC74 flip-flop, IC2, change state on the rising edge of the end-of-conversion (EOC) signal.Source Link :
4-bit µP's A/D converter decodes keypad's inputs 2008-02-13 17:13:00 Fig 1 shows a Mitsubishi M50927-XXXSP/FP 4-bit microcontroller decoding a 4×4 keypad using only four digital I/O lines instead of eight. Saving four of a 4-bit µC's precious I/O lines couild be significant. The 4-bit µC's ADC provides the key to the savings. The µC's output lines, F1 through F4, energize the keypad's column lines one at a time via 74HC4049 buffer/ driver. If a user presses a key, the µC's ADC reads an analog voltage coresponding to the row of the pressed key.Link Source: Read more:converter
DPP adds versatility to VFC 2008-02-08 01:27:00 The basic VFC (voltage-to-frequency converter) in Figure 1 comprises an integrator (IC1) and a Schmitt-trigger circuit (IC2). The integrator converts the dc input voltage, VIN, to a linear voltage ramp, and the Schmitt trigger sets the limits of the integrator's output voltage. Feedback around both circuits provides the condition for oscillation. The DPP (digitally programmable potentiometer) in Figure 2 adds programmable limits to the Schmitt trigger and adds two powerful features to the VFC.Source:
40KHz Voltage to Frequency Converter 2008-02-08 01:24:00 This circuit was designed to frequency modulate a 40KHz carrier, using human voice frequencies. A common flip/flop is used at the core of the circuit.Source:-Circuits/vco1.htm Read more:Voltage
, Frequency
Voltage Monitor by 741 2008-02-07 08:36:00 Parts List D1 LED R1 1.2k Resistor R2 10k Var. Resistor U1 UA741 OP AMP Description When the input voltage is 0 the LED glows. The LED stops glowing when the voltage rises to the level determined by R2. Reverse + and - pins to reverse operating mode. To set voltage at which LED goes off, (1) Set 0V at input. (2) Set input voltage at desired level. (3) Adjust R2 to point right after LED goes out.author: Paul Stilo Read more:Voltage
, Monitor
Logic Probe by 74LS47 2008-02-07 08:30:00 This circuit is a LogicProbe
. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. To check the logic level, we must connect the "Test" wire of the probe to the desired node of the circuit that we want to check.Source:
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