A40 power amplifier PCB, top
A40 power amplifier PCB, bottom
A40 Class A Audio Power Amplifier Boards (pair)
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A40 Class A Audio Power Amplifier Boards (pair)

Regular price $9.97 $0.00
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  • Class A audio power amplifier.
  • Designed by Nelson Pass and enjoys steady following despite being around for 40 years.
  • 40 Watts per channel.
  • Low part count, all through hole, easy to assemble.
  • One board per channel; two boards are required for a stereo amplifier.
  • The board closely follows the published design except it allows using Q11 with any pinout, making part substitution easier.
  • The output stage (4x power Darlinton transistors and 4x 0.68ohm emitter resistors) needs to be assembled off board.
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