1E)
This circuit was found in a Popular Electronics from the 90s. The circuit generates different control signals over the same line. The transistors are from the era.
Using LM3909 integrated circuits, this circuit was found in an American documentation from the...
This circuit was found in an ancient American documentation. The components of the time are not...
This circuit with low impedance output and 900k input impedance was found in the October 1993...