This circuit can be used in measurement bridges. We found it in the September 1995 Electronics Now magazine. The meter can be from 50 uA to 1 mA and the power supply is simple.
This circuit incorporates the passive control of the previous circuit and was also found in the...
A rectangular signal applied to the input of this circuit becomes a negative pulse, which...
Found in a 1965 Motorola documentation this circuit drives magnetic-type fuel pumps found in cars...