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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...
SW Loop Antenna – Circuit Schematic
SW Loop Antenna
The small single turn magnetic loop (SSTML) antenna consists of a single winding inductor, about 3 feet (1 meter) in diameter, and a tuning capacitor. A second ...
SW Loop Antenna – Circuit Schematic
SW Loop Antenna
The small single turn magnetic loop (SSTML) antenna consists of a single winding inductor, about 3 feet (1 meter) in diameter, and a tuning capacitor. A second ...
Regenerative AM Receivers – Circuit Schematic
Regenerative AM Receivers
The regen is basically an oscillator circuit with a gain control that allows the user to adjust the feedback to a point just below oscillation or, quite often, ...
Simple Transistor Reflex Receivers – Circuit Schematic
Simple Transistor Reflex Receivers
This reflex radio project was inspired by Robert Bazian 's design. His reflex radio is the "darndest" thing I have seen and his spectacular results inspired me ...
Active Antenna – Circuit Schematic
Active Antenna
Antennas that are much shorter than 1/4 wavelength present a very small and highly relative impedance that is dependent on the received frequency. It is difficu...
Active Antenna – Circuit Schematic
Active Antenna
Antennas that are much shorter than 1/4 wavelength present a very small and highly relative impedance that is dependent on the received frequency. It is difficu...
Simple Coil-less AM receiver
This AM receiver is working perfectly without the need of coils or even a variable capacitor. The LF356 is the basic component. P1 and P2 are the frequency sele...
SAB6465 Frequency Divider – Circuit Schematic
SAB6465 Frequency Divider
The circuit is a divider by 64 used in many RF applications like as satellite receiver, digital tuners, frequency counters, PLL, etc. The heart of circuit is an...
1 Watt Linear RF Amplifier – Circuit Schematic
1 Watt Linear RF Amplifier
The RF circuit is a C-Class power amplifier . it is used in last stage of transmitters .Its maximum power output is about 1 Watt . the circuit can be used in 3 ...
Video to RF Signal Conveter – Circuit Schematic
Video to RF Signal Conveter
This circuit is a RF modulator which can be used for modulating of video signals. The P1 controls the Light and the P2 controls the contrast of video signal. Th...
FM Transmitter (2N2222) – Circuit Schematic
FM Transmitter (2N2222)
This circuit is a simple two transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless mic...
Coil-less FM Transmitter – Circuit Schematic
Coil-less FM Transmitter
The RF oscillator using the inverter N2 and 10.7Mhz ceramic filter is driving the parallel combination of N4 to N6 through N3.Since these inverters are in paral...
VHF Audio/Video Sender – Circuit Schematic
VHF Audio/Video Sender
The circuit presented here is a simple audio/video transmitter with a range of 3 to 5 metres. The A/V signal source for the circuit may be a VCR, a satellite re...
VHF Video Sender/Transmitter – Circuit Schematic
VHF Video Sender/Transmitter
This circuit is a powerful video sender in VHF band. The modulator section is designed to operate on either channels 7 to 13 or 14 to 29. For channels 7 to 13, ...
RF based Automatic meter reading – Circuit Schematic
RF based Automatic meter reading
RF based Automatic meter reading, or AMR, is the technology of automatically collecting data from energy meter and transferring that data to a central database ...
FM Transmitter – Circuit Schematic
FM Transmitter
Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet...
Tunable IF with TDA7000 – Circuit Schematic
Tunable IF with TDA7000
This circuit has `suffered` a lot of modifications over its long life... Even the lettering on the integrated circuit was partially erased of the years. The ...
500mW FM transmitter – Circuit Schematic
500mW FM transmitter
The TX500 is a simple to build 500mW FM Transmitter. It consists of three blocks; modulator / oscillator, two stage 500mW VHF amplifier and LED based power mete...
300mW FM Transmitter – Circuit Schematic
300mW FM Transmitter
Here it is a brand new TX300 FM transmitter. The amplifier has exactly the same architecture as TX500 with the difference that TX300 has only one stage variable...