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This simple mosfet power audio amplifier circuit, with TL071C and 2 MOSFETs (IRF9530 and IRF530) can deliver up to 45W on 8Ω speaker or 70W on 4Ω speaker. This schematic is based on Siliconix ...
Although JFETs will work in most of the circuit layouts shown for junction ... for an IRF140 at an ID value of 15 A. Figure 9.21: MOSFET characteristics. 9.9 Power BJTs vs Power MOSFETs as Amplifier ...