This is a low-gain amplifier to operate as a booster. We found it in an American documentation from 1947. The circuit uses a coupling transformer at the input.
This small AM transmitter was found in a Japanese publication from the 1960s. The coil has 20 + 80...
This simple 2-transistor radio is from Radio Electronics in October 1952. The circuit outputs a...
Placed near a telegraphic transmitter (CW) and with a small antenna or pickup, it reproduces the...