This simple digital circuit tester can work with TTL technology when powered by 5 V and with CMOS when powered by voltages from 3 to 15 V. The circuit provides LED indications and uses current ICs.
This circuit for some amps was found in a 90s Radio Electronics. The voltage can be between 6 and 25 V...
This astable circuit has a different configuration. We found it in a Radio Electronics from...
This treble and bass control drains some milliamperes from a 12 V supply and can be used with any...