Optical tachometer (CB9349E)

We found this circuit in a 1970 publication by General Electric. The components can be changed according to the indicator.

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Pierce Oscillator (CB12686E)
This oscillator has its frequency controlled by crystal and its frequency can be between 100 kHz...
Astable with the 741 (CB13600E)
This circuit is from a 1978 operational amplifier manual. The power supply must be symmetrical, and the...
1.2 V to 33 V x 3 A power supply (CB1214E)
This useful benchtop power supply uses a single LM350 integrated circuit as a regulator. The...