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Data Logging / Acquisition Circuits

 
Circuits Designed by David Johnson, P.E. :

120 VAC / 240 VAC Indicator

Characteristics of CMOS Logic Inverter Amplifiers

Digital noise generator

Divide a TTL Clock Signal by 1.5

DVD Recorder + TV Camera Make Cheap Data Logger

Indicates 120 VAC or 240 VAC

Slotted Opto-Sensor used in Honeybee Counter

 

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