Active tone control (CB9373E)

This circuit is from a Radio Electronics from the 90's. The integrated circuit is from the time and the boost gain is 20 dB.

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NOR gate with the 7400 (CB22406E)
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The Transistor as Switch (CB922E)
This circuit can be used as shield or to drive powerful loads from low current switches such as...
Sinusoidal Oscillator (CB8427E)
Found in a 90s Electronic Design, this circuit can generate sinusoidal signals from 0.1 Hz to 25...