Using an integrated circuit that was available at the time, this circuit produces animal sounds such as mooing, rooster crowing, etc. The circuit is from a March 1997 Electronics Now magazine.
This circuit was found in a 1990 Electronics Handbook. The transistors can also be the BC548 and...
This circuit is from a 1987 American publication called Electronics Handbook. The circuit can be...
This 1995 documentation circuit detects when an extension on a phone line is active. Adjustment of the...