The coils of this circuit will determine the transmission frequency of this device. The circuit is from the 1960 Mullard transistor reference manual and makes use of germanium transistors.
This small transmitter with 2 transistors can reach several hundred meters using a 30 to 70 cm...
Although modern integrated versions exist, this 1995 circuit shows a discreet solution with common...
This circuit from Ferranti was released in 1969. It makes use of the company's transistors that admit...