AC Delay (CB21433E)

This trigger-delay circuit was found in a 1960s General Electric unijunction transistor manual. The circuit applies to the 2N2646.

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Telephone Disc Simulator (CB12072E)
This circuit mimics the dialing of an old telephone. The reproduction is made in a loudspeaker and the power...
Gain Controlled Amplifier (CB24003E)
The gain of this circuit depends on the frequency of the input signal. The circuit is from a Radio...
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This tone control was obtained in a Signetics documentation of the 90s. The integrated circuit can be...