This 6-transistor commercial radio with 6 V supply was found in a Japanese publication from the 1960s. The circuit is a commercial superheterodyne with 150mW to 200mW of battery powered output.
Found in a 1990s Motorola documentation, this high voltage circuit uses a PUT that is not a common...
This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the...
This circuit is from a 1998 Poptronics. The circuit triggers a buzzer after a certain time, waking...