This commercial radio for the AM band was sold in Japan in the 1960s. The circuit has an IF of 455 kHz and is powered by batteries. The push-pull output gives a good audio power.
This simple MW radio does not need an external antenna to pick up local stations. It was found in a...
This is a typical ohmmeter circuit with 50 uA analog instrument. The circuit was found in Radio...
This very simple circuit turns on an LED when an object interrupts the light that falls on the...