This circuit was obtained in an old magazine from the 1970s. The circuit can still be assembled with modern transistors. We can use BC558 for TR1 and TR2, BD136 for TR3 and TIP42 for R4. The component values can also be changed to the most modern standards. The circuit works with a source of at least 1 A. The interconnection wire of the stations must be a maximum of 20 meters long. 8-ohm speakers can be used.
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