This circuit was found in Radio Electronics magazine from August 1966. The transistors are from the time and the power supply from the power grid is included.
This circuit produces a clef sound when a pulse is applied to its input. The damping effect is...
This circuit can serve as the basis for a simple phone. The LM10 is not common today, but the...
This is a possible circuit for the receiver of the previous circuit. Other circuits can be found...