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AVR FM Stereo Transmitter – Circuit Schematic
AVR FM Stereo Transmitter
A composite stereo signal, as transmitted by FM radio stations, is composed of at least three parts: A base band mono signal, a double sideband channel differen...
Foxhole crystal radio – Circuit Schematic
Foxhole crystal radio
Building a foxhole radio is rewarding and the basic setup is very simple. It is, however, difficult to adjust, and it may take several attempts to find a proper...
Selective Frequency Crystal Radio – Circuit Schematic
Selective Frequency Crystal Radio
The coil on the left is coil#1, and has 17 taps. The other coil is coil #3. The vertical strips are the lath material, screwed to the 1 foot long base. Hole...
FM Broadcast Audio Transmitter – Circuit Schematic
FM Broadcast Audio Transmitter
The circuit consists of a frequency modulated oscillator, an audio preamplifier with pre emphasis to supply the frequency modulating signal, and a buffer amplif...
Schottky Field Strength Meter – Circuit Schematic
Schottky Field Strength Meter
When an antenna is attached, (or even if not, in the presence of a strong RF field) the field strength meter has a moving coil meter to indicate relative field ...
Schottky Field Strength Meter – Circuit Schematic
Schottky Field Strength Meter
When an antenna is attached, (or even if not, in the presence of a strong RF field) the field strength meter has a moving coil meter to indicate relative field ...
Bug FM Transmitter – Circuit Schematic
Bug FM Transmitter
The circuit is basically a radio frequency (RF) oscillator that operates around 100 MHz. Audio picked up and amplified by the electret microphone is fed into t...
Crystal Radio – Circuit Schematic
Crystal Radio
The source connection is tapped into the tuning coil low down, as a means of impedance matching with the headphones and acts as the anode, while the drain conne...
Crystal Radio with LM358N – Circuit Schematic
Crystal Radio with LM358N
The AM signal is captured by the antenna , 10 mt long horizontal wire, WELL insulated from earth (I mean distant, to lower the stray capacitance coupling with g...
4W FM Transmitter with 2N2219 – Circuit Schematic
4W FM Transmitter with 2N2219
This transmitter needs heatsink at 2N2219. With the C4 we regulate the frequency. With their C7, C8 we adapt the resistance of aerial (practically to them we re...
FM reciever with classic TDA7000 – Circuit Schematic
FM reciever with classic TDA7000
With the P1 we regulate the intensity of sound. With the P2 we regulate the frequency of reception. Optionally: If you want to check the frequency with your PC ...
40W FM transmitter with valve EL34 – Circuit Schematic
40W FM transmitter with valve EL34
The catering better it does not become at straight line from the network 220V but via transformer 220V/220V of isolation and safety 1A. When does not exist the ...
Simple CB transmitter with BD329 – Circuit Schematic
Simple CB transmitter with BD329
For the regulation it needs a voltmeter (with needle better) and charge 50W/5W. Connect charge 50W in the place of aerial, with the voltmeter in the exit voltme...
Simple CB receiver with SO42P – Circuit Schematic
Simple CB receiver with SO42P
For the regulation needs a transmitter or generator in mpa'nta the CB, that is to say in the region 27MHz. If you have a certain friend with CB, you convince yo...
4 Watt FM transmitter – Circuit Schematic
4 Watt FM transmitter
This is a small but quite powerful FM transmitter having three RF stages incorporating an audio preamplifier for better modulation. t has an output power of 4 W...
4 Watt FM transmitter – Circuit Schematic
4 Watt FM transmitter
This is a small but quite powerful FM transmitter having three RF stages incorporating an audio preamplifier for better modulation. t has an output power of 4 W...
100 MHz RF Oscillator Circuit
The following schematic diagram shows the design of a 100 MHz Radio Frequency RF Oscillator Circuit. The electrets microphone picks up and amplifies sound then ...
VFO stabilization with 2N4416 – Circuit Schematic
VFO stabilization with 2N4416
The coil is about 25 turns #28 wire on a T-44-6 core, tapped at about 5 turns. I'm too lazy to open my VFO and count it for you -- besides, you'll probably have...
VFO stabilization with 2N4416 – Circuit Schematic
VFO stabilization with 2N4416
The coil is about 25 turns #28 wire on a T-44-6 core, tapped at about 5 turns. I'm too lazy to open my VFO and count it for you -- besides, you'll probably have...
LF Exciter using I2PHD/IK2CZL JASON – Circuit Schematic
LF Exciter using I2PHD/IK2CZL JASON
The unit described here is simple to build, and can be quite small. The picture below shows the prototype, in a box 175mm wide, 210mm deep and 55mm high. The si...