This filter has the components calculated for the frequency of 1 kHz but can be changed. The input resistor can be 100k and the source symmetrical. Any operational amplifier can be used.
The circuit shown has the advantage over the reductions with resistors to have a much higher...
This circuit uses a switch to select the direction of rotation of a DC motor. It was found in the...
Found in American documentation, this circuit can make use of modern equivalent transistors. The...