FM Spy Transmitter Low Powered circuit

A simple three-transistor FM wireless microphone that can transmit a strong signal. It has a wide tuning range from 80 MHz to 120 MHz, allowing transmission within the FM broadcast band (88 to 108 MHz), and can be received by...

Remote-Control Transmitter Circuit

This transmitter emits an FM signal within the 88 to 108 MHz frequency range, featuring a tone of 19 kHz. This tone can activate the FM MPX pilot carrier indicator, allowing interfacing with external devices. L4 is designed for use...

Wireless Keylogger circuit

The Wireless Keylogger consists of two main building blocks: the transmitter and the receiver. The actual keylogging takes place in the transmitter, which is in fact a PS/2 hardware keylogger, with a built-in 2.4 GHz wireless module. Captured keystroke data...

200mW FM transmitter

Here is the latest and greatly improved TX200 VFO/VCO FM transmitter. The most versatile transmitter to date that can be turned into high fidelity stereo PLL based 200mW FM transmitter. It is a perfect circuit for transmitting your music around...

RF 433MHz - 3 channels remote control

The schematic is very simple and includes, in addition to Nutchip, with its three driving transistor and LED, the radio receiver. The data come from the OUT pin of the receiver and enter the pin REMOTE remote control. The RESET...

Phone line FM transmitter

Here is a simple yet very useful circuit which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this circuit is that the circuit derives...

Fm Radio Transmitter Circuit

An FM radio generates an interference signal that can be detected on another FM radio tuned 10.7 MHz higher than the original. A 50 kΩ potentiometer is used to adjust the modulation level to its maximum without introducing distortion. An...

3v fm transmitter for short distance

The core component of the circuit is a Colpitts type oscillator. The capacitors C3, C4, C5, C6, diodes CD1-CD2, and inductor L1 determine the oscillation frequency. The active components in the oscillator include the BF982 and a dual-gate MOSFET. When...

Wireless alarm FM transmitter module

There are many alarm systems available, but building a custom one may be appealing. This project can be assembled using affordable components that are easily accessible. The alarm transmitter module features a delayed trigger and an automatic turn-off function, operating...