This circuit supplies currents from 100 mA to 2 A per R. The circuit is from a 90s American documentation. The components used are common today.
This circuit can function as an output shield for microcontrollers, being compatible with TTL...
This circuit is from a 1979 publication, using displays of 7 segments of common cathode. The...
This circuit is from an English publication of 1982. The bipolar transistor can be a BC548 and the...