This circuit was obtained in a 1974 magazine Radio Chassis Television, but as we can see by the type of design, it was taken from an English magazine at the time. The circuit can be easily assembled nowadays using BC548, BC549 and BD135 transistors for TR2. Signal input and output cables must be shielded. The low consumption allows 9V battery power, although the source for BY1 is more recommended given the presence of the lamp.
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