Dual function timer (CB20363E)

This circuit was found in 80's telecom documentation. Its purpose is to control a microphone in the process of transmitting voice and Morse signals.

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Relativity Converter (CB24751E)
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Class B 15 W Output Stage (CB984E)
This circuit, found in a publication of the year 1968, uses a transformer to drive two power...
Precision Timer (CB15099E)
This 100-second timer was found in a 2000 Poptronics. The magazine no longer exists, but the...