This circuit was found in the February 1994 issue of Electronics Now magazine. The circuit uses 6 and 12 V regulators that must be equipped with heat sinks. The current is 1A (max).
This circuit was found in a telecommunications publication of 1978. Its purpose is to obtain...
In this circuit of an American publication of 1978, the integrated circuit may be the 4001 and the...
We found this circuit in an 80's Radio Shack publication. The circuit uses a company buzzer, but...