If it is desired to connect a video signal originating from a camera or other video source to a normal TV set, you will need this modulator. The audio and video signal is converted into a UHF TV signal so that the signal can be received through the TV antenna input. In certain countries (find out from your national telecommunications authority) it is permitted to use this modulator as a mini-transmitter by connecting a small antenna to it. With this facility it is possible to receive the signal from the video recorder or camera elsewhere within your home (range ~100′). The kit comes complete with housing and antenna connector.

Specifications:

* Input: rca style audio and video jacks
* Output: UHF channel 21 (450 - 500MHz adjustable)
* Power supply: 12 to 15V DC / 100mA
(Need a Power Supply?)
* Dimensions: 2.8″ x 4.1″ x 1.2″

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This kit teaches you basic mechanical and electronic circuits. Lesson includes magnetic recording, audio amplifier theory, motor speed control, mechanical switches, and much more.

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Be “On Air” with your own radio station! This transmitter is an exciting product that will broadcast a high quality stereo signal in the 88 – 100MHz FM band. It can be connected to any type of stereo audio source such as personal computer, CD player, Walkman, television, tape deck or stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.

It can also be used in a car to play CDs through your car radio when attached to a personal CD player. Other applications could be listening to a satellite radio station through any FM radio. In addition, it can be connected to your personal computer or laptop to enable listening to Internet radio stations or pre-recorded digital music (such as MP3 files).

The circuit includes a 9V battery snap and a 3.5mm stereo jack mounted right on the board for easy connection to any audio source. An ON/OFF switch as well as an “On-Air” LED indicator are also incorporated on the board.

The circuit is based on the popular BA1404 stereo broadcaster IC which contains all the complex circuitry for generating the stereo FM signal. A 38 KHz crystal provides a stable sub-carrier for the stereo signal. The oscillator circuit is stable enough for reliable reception even on digitally tuned FM radios. Separate right and left input level adjustments are also included.

Specifications:

* Supply voltage: 6 - 9V DC (Includes snap for 9 volt battery, 12V DC with minor modification) (Need a Power Supply?)
* Frequency adjustable: 88 to 100MHz
* Power consumption: < 20mA
* Power Output ~ 1mW
* Transmission range: approx. 400 feet (unobstructed)
* Input sensitivity: adjustable from 50mV
* Channel separation: > 30dB
* Includes 3.5mm stereo jack
* L: 3″ W: 2-1/8″ H: 1″.
* Any FM receiver can be used to listen to broadcast.

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This complete high quality, low noise stereo audio power amplifier is based around the Hybrid Integrated Circuit STK4432 manufactured by Sanyo. The circuit incorporates volume and balance controls and has a maximum music output power of 55W per channel (35W per channel RMS). The circuit incorporates an on board power supply; therefore, only an appropriate transformer is required to power the circuit.

Specifications:

* Supply voltage: 30 to 36V AC transformer / 2 to 3A
or 30 to 36 VDC at 3 Amps
* Input sensitivity: 300mV
* Output power using 36V AC:
* Music power – 2 x 55W / 4 Ohm
* RMS power – 2 x 35W / 4 Ohm
* Includes volume and balance controls
* Maximum distortion: < 0.2%
* Frequency response: 30Hz to 30KHz
* PC board dimensions: 4-3/4"L x 2-1/8"W x 2-3/4"H

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