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FM Receiver circuit – Circuit Schematic
FM Receiver circuit
Based on Valvo FD-1A module, TBA120, and MC1310. Operation of the receiver is based on the phase locked loop principle. The FD-1A contains an RF amplifier, osci...
5W Chinese PLL FM Transmitter With LCD Printed Circuit Board (PCB) – Circuit Schematic
5W Chinese PLL FM Transmitter With LCD Printed Circuit Board (PCB)
Here's PLL FM transmitter circuit from china. This circuit uses the familiar 2SC1971 for final power amplifier stage. The PLL controller of the FM transmitter u...
Stereo PLL FM transmitter – Circuit Schematic
Stereo PLL FM transmitter
This is the latest BH1417 FM Transmitter design from RHOM that includes a lot of features in one small package. It comes with pre-emphasis, limiter so that the ...
FM transmitter with two 2N3904 – Circuit Schematic
FM transmitter with two 2N3904
This circuit uses a small microphone to capture the sound and some transistors to generate radio waves that can be picked up by a FM receiver like a car stereo....
80 Watt stereo transmitter – Circuit Schematic
80 Watt stereo transmitter
This transmitter was designed from the ground up to provide very high sound quality, coupled with excellent frequency stability, reliability, etc. It can be use...
80 Watt stereo transmitter – Circuit Schematic
80 Watt stereo transmitter
This transmitter was designed from the ground up to provide very high sound quality, coupled with excellent frequency stability, reliability, etc. It can be use...
6-17 MHz SW reciever – Circuit Schematic
6-17 MHz SW reciever
Its very simple as It uses only 3 transistors 2n2222.The Coils can be altered to change the range of reception by lowering or highering the frequency....
FM reciever with LM386 – Circuit Schematic
FM reciever with LM386
his coil is home-made. It is actually a single layer 'tapped' air core coil. Please refer to my special section on how to make the DRAIN Coil. Once it is made, ...
AM reciever with MK484 – Circuit Schematic
AM reciever with MK484
The basic MK484 (Replacement for the ZN414) connected in its minimum configuration as a radio receiver for the A.M. Broadcast band and the upper half of the Uni...
RS-232 to 100 MHz RF adapter – Circuit Schematic
RS-232 to 100 MHz RF adapter
This section describes an experimental low power, low bandwidth data signaling system that operates at 100 MHz (In the FM broadcast band in the U.S.). Before o...
1.5V Battery FM transmitter – Circuit Schematic
1.5V Battery FM transmitter
This implementation is adapted to rebroadcast the output of a CD player, television receiver, or radio receiver. I use it so that I can move about the house and...
AVR LED RF Field Strength – Circuit Schematic
AVR LED RF Field Strength
Useful as a transmitter tune-up meter or an RF sniffer, this is an RF field strength indicator that is loosely based on the Broad Band RF Field Strength Probe, ...
330 MHz prescaler for AVR frequency meter – Circuit Schematic
330 MHz prescaler for AVR frequency meter
These parameters are expected with an approximately 50% square wave up to frequencies of seveal MHz, and symmetric sine waves at higher frequencies. The primary...
Loop antenna for 187 KHz – Circuit Schematic
Loop antenna for 187 KHz
This 1 square meter antenna has radiation resistance of about 10 nanohoms, making the 0.4 Ohm resistance (including skin effect, which about doubled the resist...
AM receiver – Circuit Schematic
AM receiver
This is a description of an experimental AM receiver for VLF. It is crystal controlled to receive 181.818 kHz (more or less) and operates as either a single con...
RF Field Strength meter – Circuit Schematic
RF Field Strength meter
As I used this probe last nigh to determine if a 384 MHz oscillator was really working or not, I remembered email I received a while ago, asking how to make a f...
FM VFO circuit – Circuit Schematic
FM VFO circuit
The inductor is made by winding 8 turns of #24 insulated solid copper wire on a 5 mm screwdriver. I used a conductor from a piece of category 5 quad twisted pai...
187 KHz RF oscillator – Circuit Schematic
187 KHz RF oscillator
An oscillator, a small power stage, some modulation, and a tiny loop antenna make RF for experiments on at 187.5 kHz on the United States' FCC Part 15 Lowfer b...
Tiny Tuned Loop Antennas – Circuit Schematic
Tiny Tuned Loop Antennas
Loop Antennas are considered to be "samall" when their diameter drops below about 1/10 of the wavelength they are intended to be used at. In this case, I use th...
RF data link and remote control – Circuit Schematic
RF data link and remote control
This section describes an experimental low power, low bandwidth data signaling system that was initially made to operate at 55 MHz (television channel 2 in the ...