We found this circuit in the 1983 Radio Electronics Special projects magazine. The components are common, and the circuit drives a relay. The power supply must be isolated.
Texas Instruments LMV3xxA operational amplifiers are low voltage types (2.5 to 5.5 V). In the...
This amplifier step with a transistor has an input impedance of 100k to 10 M. The transistor can be any...
This circuit is from 1993 documentation. The table shows the component values for voltage...