This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be assembled easily, since all the components are common. The transistor can be the BF245 and L2 consists of 80 turns of wire 28 in a ferrite rod. L2 is formed by 20 turns of the same wire on the same rod. An external antenna must be used, and the handset can be crystal or piezoelectric. The supply can be done with voltages from 3 to 9 V.
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