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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Ladder Generator (CB7873E)
This circuit was found in an American documentation from 1968. The circuit generates ladder-shaped...
Switch lighting (CB7965E)
This circuit keeps an LED on briefly when S1 is pressed. The time depends on C1. The circuit is...
Two Position Digital Servo Shield (CB19800E)
This circuit was found in old documentation, but it adapts perfectly to modern applications with...