In a reflex receiver, the detected audio signal is applied back to the circuit input to receive new amplification. In this receiver L1 is formed by 10 turns of wire 28 in a ferrite rod and L2 by 80 + 10 turns of the same wire in the same rod. The output transformer can be obtained from unused transistor radios and the transistors can be the BC548. The circuit was obtained in an international publication.
