Found in a 90s Electronic Design, this circuit is used with a 9 V adapter for powering small circuits. The maximum current is given by the 250-mW regulator.
This simple Bargraph photometer with 4 LEDs was found in a 1997 documentation. The scale is...
This photo-relay uses a Darlington stage to increase sensivity. Any photo-transistor can be used....
This oscillator generates a low-frequency sawtooth signal determined by the value of C1. The...