With this circuit, signals in the range of 10 kHz to 150 kHz can be received at close to 4 MHz from a shortwave receiver. The circuit is from a 303 Circuits from the 90s.
This simple electronic music box circuit was found in the April 1985 issue of Radio Electronics. The...
This circuit was found in an Electronics Now of the 80s applying to NiCad batteries of the time....
The power source shown for powering for small TTL circuits was found on a Radio Electronics...