This circuit uses NOR ports to generate signals up to 10 MHz, depending on the crystal. The supply can be done with voltages from 5 to 15 V and the signal generated is rectangular.
I got this circuit from an English magazine from 1977. It can still be easily assembled, as the...
In the figure we have a three-phase AC motor control for voltages up to 600 V or 1200 V depending on...
We found this circuit in a 1980 publication. It can be applied to Triacs of the TIC series and the...