This simple injector circuit can actually be powered by voltages from 3 to 9 V. The frequency is given by C1 which can be between 4.7 and 10 nF. The CMOS can also be 4011.
This circuit produces a 2 kHz tone on a standard piezoelectric transducer. The circuit can be used as...
We find this circuit in a 1995 documentation. It warns when the timing is nearing its end, with...
This simple digital circuit tester can work with TTL technology when powered by 5 V and with CMOS...