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 |

Dwell meter (CB23521E)
This old circuit for circuit breaker cars was found in a 1963 publication. The transistors are...
Passage Alarm (CB10708E)
This circuit was obtained in a 1973 national publication, translated from an English publication of the...
800 Hz 555 Tone Generator (CB25517E)
Found in an October 1992 Radio Electronics magazine article, this circuit generates a low-power tone in...