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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Completing the Last Cycle (CB13639E)
The purpose of this interesting circuit found in a 1977 documentation is to complete the last...
High Power AC Shield AC (CB18266E)
This circuit allows to drive a triac with high power AC load from a CMOS output or directly from a...
TTL Clock Generator (CB20094E)
This circuit was obtained in a documentation from the 80's. However, using TTL it is still modern,...