This circuit covers 400 kHz to 40 MHz in three bands according to the selected coil. The double MOSFET allows equivalent, since the original is not easy to obtain.
This switching buck regulator with the NE5560 was found in the February 1980 issue of Radio...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
This simple rain, leak or moisture detector circuit appears in other places on this site with...