15W transmitter power amplifier

An experimental crystal FM Transmitter circuit

Auto tune  pocket-sized FM radio circuit

Automatic telephone recording device control circuit

Cell phone signal jammer design and production circuit

Easy to make long-distance wireless FM microphone circuit

Experimental production of FM transmitter

FM radio transmitter using varactor diode

FM wireless microphone band regulator circuit

Half-duplex walkie-talkie circuit with LM386

Infrared port (Irda) circuit for Home PC

Long-range FM transmitter circuit

New FM receiver circuit

Several wireless microphone circuits

Simple and easy FM transmitter circuit

Solar Radio circuit

Telephone attached recording circuit with amplifying devices

Telephone combined - ears circuit for home security

Telephone line anti-theft alarm

Ultra-long-range high fidelity FM receiver

Wireless microphone circuit using NAND gate

Made the simplest radio circuit