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Hobby Helpers - Neat stuff for the Hobbyist.
Frequency Multiplier (34K file) is a circuit to help measure audio frequencies on a low cost frequency counter. (Frequency Multiplier Schematic = 65K file)

PIR Light Switch (73K file) is a traced out schematic of a Motion Detector light switch. I bought it at a home center for $10-$20. The sensor works at 5 volts and the custom(?) chip takes about 8 volts.
THIS IS FOR EDUCATIONAL PURPOSES ONLY!
DO NOT APPLY HIGH VOLTAGE TO THE UNIT WHILE WORKING ON IT. IT CAN KILL YOU!



 

 
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