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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Exposure time meter (CB8114E)
Indicated by a Popular Electronics of the 90s originally to measure the light determining the exposure...
TTL Buffer MC34071 (CB15280E)
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 d...
Source follower (CB6963E)
Found in American documentation, this circuit shows how to polarize a FET in bootstrap mode. The...