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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Temperature Controlled Oscillator (CB13941E)
This Signetics precision circuit from a 1977 manual provides a signal whose frequency varies with...
Zener Coupling (CB4139E)
According to the consulted American publication of the 1980s, a zener diode can be used for DC...
1 MHz CMOS Oscillator 4049 (CB15648E)
This crystal-controlled oscillator generates a 1 MHz rectangular signal and can be used as a time...