RF Circuit

Wireless FM Transmitter

FM Transmitter

USB Powered Wireless FM Transmitter Circuit

Here’s a Wireless FM transmitter circuit powered from USB ports that could be used to play audio files on a standard VHF FM radio. The transmitter circuit use no coils that have to be wound. This FM transmitter can be used to listen to your own music throughout your home. When this FM transmitter used in the car, there is no need for a separate input to the car stereo to play back the music files from your MP3 player. Read more…

FM Receiver

FM Receiver

One Transistor FM Radio Receiver Circuit

Here’s simple FM receiver circuit for a simple superregenerative FM radio. It is sensitive, selective, and has enough audio drive for an earphone. These designs generally have low component counts, however the design or my construction have been far from simple. Read more…

Emergency Radio

Emergency Radio

Emergency Crystal Radio

Crystal radio requires no power supply to operate because it uses energy from the signals it receives. Performance is – like one should expect – poor. Nevertheless, with a good antenna and proper ground, it shouldn’t be too difficult to tune to a strong AM station. Read more…

iTrip FM Transmitter

iTrip FM Transmitter

iTrip FM Transmitter Review

The iTrip FM transmitter for the iPod can play your music through any FM radio in your car, at a party, wherever the mood strikes you–and you have a radio. It’s clear that the iTrip is made specifically for the iPod. This gives iTrip advantages over similar devices. For example, with the iTrip, you can have the cleanest possible signal–because you can choose any radio station on the dial to tune for the best performance possible. You do this by ‘playing’ special station codes directly from the iPod itself. Read more…

Radio Transmitter

LCD FM Transmitter

Radio Transmitter for FM Broadcast

Here’s easy to build high-quality PLL Radio Transmitter for FM broadcast, with typical output power of 5 W and no-tune design. The transmitter includes RDS/SCA input and Audio/MPX input with optional preemphasis. It can be used with or without stereo encoder. Tuning over the FM band is provided by two buttons that control dual-speed PLL. The transmitter can work also without the LCD display. Read more…

VHF Radio

VHF Radio Transmitter

VHF Radio FM Transmitter Circuit

Here’s a VHF Radio FM transmitter. This project is a simple VHF FM transmitter using only one crystal and will cover 145.00 to 146.00 MHz. The crystal is a 44.9333 MHz crystal for 145.500 receive, as used in the Trio (Kenwood) 2200, PYE, Motorolla, Tait equipment, to name but four. The frequency of the crystal is not critical as almost any other xtal for the 2-meter band will function. Read more…

RF Wireless

RF Wireless FM

RF Wireless FM Transmitter

Here’s a rf wireless FM transmitter can be built with simple, affordable and widely available parts. Construction is fun and much can be learned although performance is modest; for example, your voice gets difficult to hear at distances greater than 25 feet. Read more…