Positive ground tachometer (CB9352E)

This circuit was found in RCA documentation from the 1960s. The circuit uses components from that time and can measure speeds up to 10,000 rpm.

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Electronic Fence (CB17136E)
This circuit uses an ignition coil to generate the high voltage that electrifies a fence. However, in...
Magnetic Microphone Preamplifier (CB25694E)
This circuit was found in the March 1994 issue of Electronics Now magazine. The circuit uses a...
Logic Tester for TTL and CMOS (CB1463E )
This circuit is from a documentation for amateurs from 1978. The circuit both analyzes logical...