The circuit presented is a Japanese commercial radio from the 1960s. With a 4.5 V supply, it is a super-heterodyne type with an IF of 455 kHz. 6 germanium transistors are used.
This power supply has been suggested for powering a meter with Numitron-type valves, which are...
This circuit is old, from an English publication from 1979, so the indicated sensor is no longer...
This circuit was found in an American documentation from the 90s. It consists of a variable with a...