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.
The coil of this receiver determines the range. It can have 2 to 10 turns of wire 20 to 24 in the...
This circuit has tone control, and its power depends on the supply voltage. The circuit is from...
This circuit with 10 MHz and 1.25 MHz TTL outputs was found in an American documentation from the...