This circuit is powered by a voltage of 4.5 V, being common in radios of the 60's. The circuit is from Mullard's transistors reference manual.
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...