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Long term FM Transmitter – Circuit Schematic
Long term FM Transmitter
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How to build Medium range transmitter – Circuit Schematic
How to build Medium range transmitter
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How to build 3W FM Transmitter – Circuit Schematic
How to build 3W FM Transmitter
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Wide-Range Doppler Antenna – Circuit Schematic
Wide-Range Doppler Antenna
Doppler units are the "weapon of choice" among mobile T-hunters in many parts of the country. They indicate the direction of incoming VHF signals on a circular ...
SpecAl <77> SpecAn – Circuit Schematic
SpecAl <77> SpecAn
I decided to try my hand at building a spectrum analyser after seeing the design by Roger Blackwell, G4PMK, in the Radio Communication Handbook5. I had to adapt...
A Basic RF Transmitter for PIR Sensors Project – Circuit Schematic
A Basic RF Transmitter for PIR Sensors Project
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Antenna Circuits / Schematics – Circuit Schematic
Antenna Circuits / Schematics
Here you can find plans for a simple ground plane antenna that works well in the FM Band (88-108MHz). It`s built of a small plastic disk 6 x 6 Loop Antenna - Th...
Opamp VHF FM Transmitter circuit – Circuit Schematic
Opamp VHF FM Transmitter circuit
This opamp is available for only a few pounds. The AD8099 is a very fast opamp (1600 V/ms) and has high-impedance inputs with low input capacitance. The bandwid...
Medium-Power FM Transmitter circuit – Circuit Schematic
Medium-Power FM Transmitter circuit
The range of this FM transmitter is around 100 meters at 9V DC supply. The circuit comprises three stages. The first stage is a microphone preamplifier built ar...
FM Beacon Broadcast Transmitter (88-108 MHz) circuit – Circuit Schematic
FM Beacon Broadcast Transmitter (88-108 MHz) circuit
This circuit will transmit a continuous audio tone on the FM broadcast band (88-108 MHz) which could used for remote control or security purposes. Circuit draws...
3W FM Transmitter circuit – Circuit Schematic
3W FM Transmitter circuit
This is the schematic for an FM transmitter with 3 to 3.5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL can...
Simple AM Transmitter circuit – Circuit Schematic
Simple AM Transmitter circuit
There are not many AM transmitters that are easier to build than this one because the inductor is not tapped and has a single winding. There is no need to wind ...
Micro Power AM Receiver circuit – Circuit Schematic
Micro Power AM Receiver circuit
This is basically a crystal radio with an audio amplifier which is fairly sensitive and receives several strong stations in the Los Angeles area with a minimal ...
ZN414 Portable AM Receiver circuit – Circuit Schematic
ZN414 Portable AM Receiver circuit
Designed around the popular ZN414 ic this receiver covers the AM band from 550 - 1600 KHz with the values shown. For Longwave the coil needs to be changed. Use ...
Servicing Radio And Sound Equipment – Circuit Schematic
Servicing Radio And Sound Equipment
The tuned circuits of capacity and inductance used in vacuum tube transmitter circuits are frequently called "tank" circuits, because from one viewpoint they ac...
Transmitter Servicing Course – Circuit Schematic
Transmitter Servicing Course
With the equipment ready for operation, the main line switch (S-831), the EMERGENCY SWITCH (S-12) and the main line contactor contacts K-831B all are closed. (1...
AM FM Simultaneous Transmitter Using Digital IC – Circuit Schematic
AM FM Simultaneous Transmitter Using Digital IC
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Medium range transmitter – Circuit Schematic
Medium range transmitter
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Transmitter FM 45W with valve – Circuit Schematic
Transmitter FM 45W with valve
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DEMODULATOR circuit – Circuit Schematic
DEMODULATOR circuit
amplifier, with bias at cutoff. Q5 acts much like a grid-leak detector. Without the subcarrier input, the demodulator cuts off and prevents signals from passing...