The frequency ranges that this receiver can tune in depend only on the coils. For medium waves L1 should have 100 turns of wire 28 in a 2 cm tube and L2 10 turns of the same wire on L1. The winding direction is important. The transformer T1 is of the driver or radio transistor output type and the FET can be the MPF102 or BF245. Circuit consumption is very low and can be powered by a 9 V battery. A good antenna and ground connection must be used.
