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.
In the figure we have a circuit for line receiver (twisted pair) with the possibility of...
This circuit appeared in the November 1995 issue of Electronics Now magazine. The circuit uses...
This circuit was found in a 1987 edition of the United States' Hands On Electronics magazine. The...