Tone Generator-Ding-Dong Bell

jacky November 22, 2011 6 Comments
Tone Generator Circuit Description Here we present a simple and low cost tone generator circuit, a ding dong bell suitable for calling bell purposes.It is made around IC 8021. It is an 8 pin IC but only four pins...
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Simple Proximity Detector

jacky April 28, 2011 11 Comments
How to make a simple Proximity detector or sensor Description This is a simple proximity detector using IC CS209. The CS209A is a bipolar monolithic integrated circuit for use in metal detection/proximity sensing applications.The CS209A contains an oscillator set...
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