This circuit was obtained in a QST magazine from the 90s. The circuit makes use of components that are uncommon today. The circuit includes a gain selection switch.
This Linear Technology circuit was found in a 1980s documentation. The circuit can swing up to a...
Using the 555 and 4020, this timer was found in the July 1994 Radio Electronics magazine. The...
This circuit activates a garage door by the car headlights car or a lantern. The circuit is from a...