This current meter with many scales was found in a 80s American documentation. The operational amplifier is from that time, uncommon nowadays.
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...