This voltage sensor limits the discharge of a Nicad battery. We found it in an American documentation from 1968. Equivalent components can be used.
This circuit is from an Electronics Now from August 1995. The triac is according to the load that...
The figure shows an application of the LM377 in a small inverting stereo amplifier with output...
Found in an American 80's documentation, this circuit can use common FETs like the BF245 and cover...