This 1 kHz filter was found in the March 1997 issue of Electronics Now magazine. The circuit is applicable to any operational amplifier with a dual power source.
This small FM spy transmitter uses three transistors with an RF amplification stage. We found it...
This circuit makes use of a constant current source to control the temperature of a direct current...
This circuit with a voltage comparator is delayed by the capacitor. The circuit drives a power...