The cut-off frequency of the circuit shown in the figure is 750 Hz, with the components used. The circuit applies to almost any operational amplifier and the power supply must be symmetrical.
In the figure we have the simple way to use a low current switch or sensor to drive a high power...
Found in a 1990s American documentation, this circuit provides an output voltage approximately 4 times...
The presented circuit uses an optocoupler to trigger a triac. We found it in a Popular Electronics from...