We found this sophisticated meter circuit in an article in Radio Electronics magazine from June 1959. The article taught how to assemble it. Transistors are common types at the time.
This circuit is from old documentation, using a component that cannot be found easily today. The...
This circuit is from a Popular Electronics from the 90's. The circuit directly drives high power...
This CMOS driver for triac was found in a 90s documentation. The circuit has direct action,...