Circuit Lake

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The circuit is a easy design an Oscillator. The main component consists of the VCO (ICL8038), the CMOS-compatible output stage using the MOSFET driver chip ICL7667 and the sine and triangle output stage (LT1210). It is capable of producing sine, triangle and square wave output with a frequency up to several hundred [...]

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This is may be the simplest radio transmitter that you will find anywhere. lt has a total of fiye parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission is useful.
lt runs on 1.5 to 3 yolts, with [...]

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If you need an alarm for your bike? then this is a simple – easy to build – transistor based motorcycle alarm could be suit with your need. This alarm will work at 12-volts but you can use 6 volt if you change the relay for 6-volt coil. It will protect your “Classic Bike” [...]

This circuit is for detecting any audio signal with justable noise offset. It could be used to generate a radio mute signal eg. from a PDA.
The circuit is consisting of:

There are serveral rs232 transceiver circuit which commond used for communicated between microcontroller and other devices such PC or any devices that use rs232.Here is a collection of rs232 transceiver circuits that popular for today.

2 transistor
The circit below use 2 transistor and some components to provide RS232 transceiver.It usefull for cheap application that dose not [...]