This circuit for photography uses was found in the Electronics Experimenter Handbook Special projects magazine from 1983. The bargraph circuit powers 8 LEDs.
Available at Mouser Electronics this component of Diodes Incorporated consists of a voltage...
Found in Radio Electronics this circuit uses a fotodiac to drive a triac. The circuit can use...
The first circuit was suggested by Analog Devices (www.analog.com) in its Application Note AN-411...