Audio Booster (CB6181E)

This reinforcing stages from a 1960s documentation. No information is given about the transformer and the transistor admits equivalents.

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AND gate LM139 (CB21028E)
Using a voltage comparator, we find this AND gate on a Popular Electronics from the 90s. The...
100 kHz Crystal Calibrator (CB3926E)
This crystal oscillator circuit is indicated for use as a frequency reference in the calibration...
Operational Amplifier Touch Switch (CB3853E)
Any operational amplifier can be used in this circuit. The 741 is the most common. Power supply must...