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 BC548 and the transformer is the type of output found on old transistor radios. Change C2 to modify the sound frequency or replace R5 with a 100k potentiometer in series with a 4k7 resistor. The power can be supplied with voltages from 3 to 9 V.
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