Using a 4046 PLL we found this circuit in the December 1989 issue of Radio Electronics magazine. The circuit operates at 220kHz, but this frequency can be changed by changing C3.
If you have a disused old computer, the type that still has a parallel port, you can use it in...
Using earphone for listening, this receiver has only one germanium transistor. The circuit is from...
This oscillator can generate signals up to a few megahertz depending on the crystal used. Actually...