We found this circuit in an American documentation from the 60s. The circuit can be made with equivalent transistors. It basically consists of a monostable.
We found this active crossover in a Radio Electronics magazine from June 1961. Note the different...
Found in Popular Electronics from the 90s, this circuit serves to indicate the output level of a...
If you are on an old PC that you use for experiments, control or other applications, this circuit is...