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100W HiFi Power Amplifier with MOSFET



The following is the electronic project to build a 100W HiFi power amplifier circuit which use power MOSFETs to get the better audio quality. MOSFETs have a high input impedance at low frequencies, and are capable (when driven by a suitable source) of extremely high slew-rates. Of course this very attribute makes them rather prone to HF oscillation when improperly compensated, but with careful design they're capable of impressive intermod performance.

Circuit design of 100W HiFi Power Amplifier with MOSFET
100W HiFi Power Amplifier circuit with MOSFET




Active components substitutions:
  • JFET input diffamp: SST404 (SO-8) can be change with ECG461.
  • Low power bipolars: MMBTA06/56 (SOT-23) can be changed with BC547/557 and BC639/640.
  • Power MOSFET drivers: 2SK1058/2SJ162 (TO-3P) can be changed with 2SK176/2SJ56 (AEM6000) or 2SK134/2SJ49 (AEM6005 and ETI5000).

Anti-thump circuit:
100W HiFi Power Amplifier circuit diagram


PCB Layout:
100W HiFi Power Amplifier PCB layout


Original source page: 100W HiFi Power Amplifier with MOSFET
Go to that page to get detailed project explanation.

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