This circuit was found in the February 1993 issue of Radio Electronics magazine. Some components depend on the crystal frequency and can be changed.
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
An OR gate can be implemented with an LM3900 transconductance operational amplifier. The circuit is...
This receiver, called Peace, was manufactured in the 1960s in Japan and was powered by a 9 V...