This sound effect circuit is from a Radio Electronics magazine from December 1969. The transistors support equivalents and the power is provided by a battery to reduce the possibility of noise.
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...