This power supply circuit was obtained from the February 1993 Radio Electronics magazine. The integrated circuit and power transistors must be provided with heatsinks.
In this circuit the 555 is configured as an adjustable timer for long intervals. The capacitor C1 can be...
The circuit shown has a differential input and employs transistors of an array of matched types. The...
This circuit for common analog telephones was found in March 1982 Radio Electronics magazine. It...