This simple circuit with two transistors was found in a 1985 publication. The power can come from batteries or battery, as consumption is very low.
This circuit, from an American publication of 1974, provides a 0.005% regulation with a variation of...
The purpose of this 1985 circuit is to make the sound test of type 106 SCRs (MCR106, TIC106,...
I found this simple basic circuit of rhythmic light in a 1980 documentation. We warn you to be...