This circuit was obtained in an Argentine publication from the 1970s. The circuit can still be assembled using modern equivalent transistors. We can use BC548 instead of BC108 and BC558 instead of BC178. We can also use an 8-ohm speaker with a small audio output transformer from 100 to 200 ohms for primary and 8-ohm for secondary. The circuit can be powered by batteries or 9 V source with at least 100 mA.
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