This type of circuit and with this integrated circuit appears several times on this website. The circuit has the components dependent on the desired current in the load.
Found in a 1990s Popular Electronics, this circuit produces a tone on a small speaker. The keyer...
This second amplifier is based on the integrated LM108 and has a differential input. The resistor...
This 80's circuitry decodes stereo signals used in analog TV at the time. The circuit can be used...