This circuit for photography uses was found in the Electronics Experimenter Handbook Special projects magazine from 1983. The bargraph circuit powers 8 LEDs.
We found this configuration in the Linear Applications Handbook of the National Semiconductor of...
The circuit presented is from the Linear Applications Handbook of the National Semiconductor of...
Using the ULN-3784B this circuit typically supplies 5 W at 24 W. However, it can operate from 9 V....