This circuit is from an Electronics Now from the 90s. The circuit uses a power integrated circuit from the time that must be equipped with a heatsink. The power supply is 18 V.
This circuit is a driver for R-2R network of AD converters. We found it in manufacturer...
This circuit was found in an American publication from the 60's. The transistor is made of...
This circuit produces an audio tone on the speaker or magnetic capsule. Rx must be such that added...