Bass Control (CB21294E)

This circuit with losses of 20 dB at 350 Hz was found in older documentation, but it applies to modern preamp and amplifier circuits.

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24 V supply with 12 V regulator (CB12089E)
With this circuit it is possible to obtain a voltage of 24 V using a 12 V regulator. The maximum...
Precision tachometer (CB9347E)
We found this circuit in a 1965 publication by General Electric. The zener is 8.2 V x 1 W and the...
Telephone in use warning button (CB9465E)
This circuit was found in a Hands On Electronics from the 90s. It turns on an LED to indicate that...