This circuit is from the magazine La Radio per Tutti of 1926. The primary and secondary coil have 100 turns of wire 28 to 32 in a PVC tube or cardboard of 2 to 2.5 cm. The outlets are 10 in 10 to 20 in 20 turns and the variable is common AM radio. The antenna must be long and a 1N34 diode can be used instead of the galena. The handset must be high impedance type.
