This circuit is from a manual from the 80's and the operational one used, uncommon nowadays, can be replaced by a modern equivalent. The power supply must be symmetrical.
This circuit, which appears elsewhere on this website, was obtained from 1967 General Electric...
This circuit can be found elsewhere on this site as part of alarms or sirens. The circuit given is...
This circuit is intended for charging 12 V Nicad batteries, which corresponds to 10 common...