567 Tone Decoder (CB25787E)

We found this circuit in the December 1994 Electronics Now magazine. The worthless components are frequency dependent.

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Pierce Oscillator (CB12686E)
This oscillator has its frequency controlled by crystal and its frequency can be between 100 kHz...
Spy Transmitter (CB19424E)
This small crystal microphone transmitter was indicated in an 80s spy book. The range depends on...
LM317 Narrow Adjustment Range Regulator (CB14428E)
The circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor. The...