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 is the circuit of an old oscilloscope, using components from the 80s. Of course, it serves...
We found this circuit in an old Radio Electronics. The transistors can be the BC548. The circuit...
The circuit shown in the figure can be used as a high voltage indicator on a power supply line of...