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The OTL power amplifier circuit made of TDA2030A

2015-01-05 12:03  
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The OTL power amplifier circuit made of TDA2030A
The OTL power amplifier is powered by a single supply and it is fixed with an output coupling capacitor. See as the figure, R5 (150 kΩ) and R4 (4.7 kΩ) decide the gain of the amplifier closed loop, the lower the resistance of R4 is, the higher the gain will be, but high gain can lead to the distortion of the signal. The 2 LEDs are connected between the power supply and the output terminal, which is used to prevent the inverting of the loudspeaker inductance load from affecting the sound quality, C3(0.22 uF) and R6(1 Ω) are used to compensate the phase of the inducting load (loudspeaker), so the self-motivation is gone, the circuit is powered by a 36V single power supply.