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1x PGA2320 attenuator & 1x 16bit MDAC attenuator

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maxw

maxw

Member
Joined 2004
I'm selling 2x attenuator modules.

PGA2320 Module
VxhdBqJ.jpg

  • Uses the newer PGA2320UA IC
  • OPA2132 output buffer so it can drive headphones
  • Panasonic and Wima caps
  • Has an ADuM7741 for SPI isolation from the micro controller (this can be bypassed by jumpers)
  • Power LED

£10


MDAC attenuator module
P2d3vY5.jpg

This attenuator module uses a 16bit R2R DAC IC and a DIP opamp to give 65536 linear volume steps. Details about the design are in this thread. This module has no gain. In my measurements with an E-MU0404 USB this module measures better than a PGA2320, has click free volume changes and sounds great.
  • Uses DAC8812 R2R Multiplying DAC IC
  • Comes with a LM4562 for IV conversion. This opamp is swappable.
  • Panasonic and Wima caps
  • Power LED

£20

Both modules require 5VDC and +/-VDC and have only really used for testing and measurements so all components are near new. Schematics, layout and Arduino code available if you want. Postage is extra (£3 UK, £5 for world).
 
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