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.
This circuit appears with variations in other points of this section. This version is from...
We found this voltage multiplier circuit in a Radio Electronics magazine from December 1991. The...
Assembled with SMD components, this FM transmitter fits into a pen. We have already published a...