This circuit is from the 1990 Motorola Data Databook. The circuit can be implemented with equivalent transistors. The power supply must be symmetrical.
This is a dimmer version for incandescent lamps (do not use any other type) from an old...
This first-order high pass filter is applicable to any operation requiring a dual power source. It was...
Below are two frequency filters for receivers using crystals. The crystals must have the frequency of...