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Featured Circuit of the Week  
View: ALL Circuits of the Week

 

Slotted Opto-Sensor used in Honeybee Counter -  I designed a circuit similar to this one a long time ago to help a beekeeper count the number of bees going into or out of a hive. The low power circuit uses a slotted opto-sensor to detect the passing bees. The circuit advances an electronic counting . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/08/00]


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Faraday Switches are a tiny one inch cube electronic modules using a capacitance change technique.  They draw very low current and are ideal for battery powered applications. 
Hobby Corner  has interesting hobby circuits -- check it out. 
Circuit Solutions Dave Johnson shares solutions to tricky design problems.
Dave's Circuits collection of circuits designed by David A. Johnson, P.E.
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Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


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