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.

| Clique na imagem para ampliar |

Signal follower (CB9983E)
This simple audio signal tracer or follower can be made with a BC548 instead of the original...
Emergency Light (CB5297E)
This setting appears on this site from other sources. This is from an 80's American documentation,...
Audio Level Controller (CB25551E)
We found this circuit in the Radio Electronics magazine of February 1993. The main integrated...