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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Simple continuity test (CB8637E)
This continuity test was found in a 90s Electronic Engineering. Transistors are types of general...
Shunt Regulator from 1 to 100 mA (CB12948E)
The shunt type regulators are connected in parallel with the load, deflecting the current to...
Speaker Protection (CB17274E)
This circuit protects the speakers in case the amplifiers have problems. With a continuous voltage...