The circuit shown was found in a Japan publication from the 1960s. The transistors can be of any type of general-purpose germanium. No details of the coil were given. The circuit is powered by a 9 V battery.
The circuit shown was found in a Japan publication from the 1960s. The transistors can be of any type of general-purpose germanium. No details of the coil were given. The circuit is powered by a 9 V battery.