Obtained in an Argentine publication from 1973, this circuit sends the signal from a small record player to a nearby AM receiver. The circuit works with voltages from 6 to 9 V and has a range of a few meters. The transistor can be a current like the BC558 and the coil is formed by 80 to 100 turns of wire 28 in a small ferrite rod. Capacitors of 25 uF can be 220 uF, which is the standard current value.
