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 common transistor-based circuit provides power for 20 mA common white LEDs from a single 1.5...
This circuit for old cars with platinum ignition was found in Radio Electronics magazine from...
The receiver shown above was sent in by contributing reader Adriano Muniz Moura and is used for...