The concept is TDA2052 amplifier bridged, powered from +12 V to -12V battery and the inverter PWM (TL494). This solution -12V converter for ''produces'' only half the power supply. The Amplifier is simplified power IC design. With such a low power they work properly in bridge load up on 4om, offering 50W of true power. To expand the system not regulated DP filter is made of a single transistor.
At current prices TDA1562Q system does not make much sense but it was to explore the same concept.
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