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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Adding Reset to a CMOS Monostable (CB128E)
Here we show how to add a reset key to the monostable using two NAND gates (CB127E). When the key...
Transistorized receiver (CB22218E)
We found this circuit in a documentation from the 50s. It is based on CK722 germanium transistors. The...
Phone pickup (CB21642E)
This amplifier circuit applies its signal to an ordinary audio amplifier to pick up signals from a...