This bargraph circuit using LM3914 was found in the October 1980 Radio Electronics magazine. Note the use of a transistor to modify the response.
We found this configuration of band rejector filter or band rejector with operational 741 in a...
The circuit shown charges Nicad batteries from the bicycle dynamo and provides constant energy for a...
This circuit requires an input current of only 20 fA (femto amps) which corresponds to a...