Precision Low Frequency 555 Oscillator (CB8088E)

Found in Electronics now, this circuit generates signals given by the formulas next to the diagram.

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5 V x 2 A Power Supply (CB24156E)
Using the 723 integrated circuit, this circuit was obtained from an article in the August 1971...
Debounced Digital Switch (CB1476E)
The configuration shown in the figure allows you to implement an debounced switch with CMOS or TTL...
Tuning fork (CB23826E)
This circuit that uses a mechanical tuning fork was found in Radio Electronics magazine from June...