Long maintenance circuit (CB8866E)

A 0 V signal initiates sampling on this circuit suggested by documentation from the 1970s. The integrated circuits used are uncommon today.

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Digital Die (CB17098E)
This circuit is from 1997 documentation, based on the well-known integrated circuit 555 and 4017....
DC Motor Speed Control (CB12321E)
This circuit is from 1980 documentation. We can exchange the BC177 for a BC557 and the TIP41 must...
Single Voltage Reducer (CB16872E)
From different input voltages V, it is possible to reduce the voltage to several fixed values...