RF Circuit

FM antenna

Dipole FM Antenna

How to Build a Dipole FM antenna

The antenna rod is made of 6 mm copper tube I found in a shop for cars. It is actually tubes for the breaks, but the tube works great as antenna rods. You can use all kinds of tubes or wire. The benefit of using a tube, is that it is strong and the wider tube diameter you use, the wider frequency range (bandwidth) you will also get. I have noticed that the transmitter gives highest output power around 104-108 MHz so I set my transmitter to 106 MHz. Read more…

FM Transmitter MP3

BA1404 FM Transmitter

FM Transmitter for MP3 Player

Do you have an idea to create your own radio station, transmit the music around the house, or simply create a wireless link between your iPod and a receiver in your car, this transmitter will let you do these things easily. With BA1404 HI-FI Stereo transmitter you will be able to transmit MP3 music from your iPod, computer, discman, walkman, and many other audio sources. Read more…

RC Radio

RC Radio

DTMF Remote Control (RC) Radio Circuit

Here is a remote control (RC) radio unit circuit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This RC circuit differs from similar circuits in view of its simplicity and a totally different concept of generating the control signals. Read more…

Wireless Transmitter

Wireless audio Transmitter

Wireless FM Audio Transmitter Circuit

Here’s is a simple wireless audio transmitter for rebroadcast audio of fm radio or any others audio source. The transmitter circuit consists of a frequency modulated oscillator, an audio preamplifier with pre emphasis to supply the frequency modulating signal, and a buffer amplifier to drive the antenna connector. Read more…

Wireless Video

Audio Video Circuit Board

UHF Wireless Audio Video Sender Circuit

This wireless circuit provides you with wireless audio and visual transmission to a TV. The TV acts as a receiver, eliminating the need to buy a separate monitor. You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system! Read more…