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.
When a voice signal enters this circuit, the volume of the music being played automatically...
This circuit for 3.3 V logic circuits has a 5 V input and the maximum output current is on the...
We found this circuit in Motorola's 1990 Linear Databook. The component used is unusual. The...