Programmable Timer (CB25200E)

This timer has a divider programmed by BCD switches. The circuit is from a Radio Electronics magazine from February 1989.

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Instrumentation Amplifier (CB12173E)
This instrumentation amplifier was obtained from Popular Electronics in 1993. The operational...
Logarithmic amplifier (CB20631E)
This circuit is from 80's Linear Technology documentation. Equivalent operational amplifiers can...
Fourth-Order Low Pass Filter (CB25816E)
This 10 kHz filter was obtained from an article in Electronics Now magazine in February 1995. The...