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 capacitance shown at the output of this circuit is given by the relationship between R1 and...
The circuits shown below consist of diode protections against accidental polarity reversal in the supply...
This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine....