This circuit was found in a 1980s American documentation. The data circuit has a low speed, according to the components used. Transistors support modern equivalents.
With this circuit it is possible to control a current of several amps, depending on Q1, from a low...
Books and e-Books by Institute NCB 100 CIRCUITS - SHIELDS FOR ARDUINO FUN PROJECTS FOR THE...
This cricket circuit obtained in a 1992 documentation has an amplifying stage that, however, takes...