I'm selling 2x attenuator modules.
PGA2320 Module
£10
MDAC attenuator module
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.
£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).
PGA2320 Module
- 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
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).
Of course! I went with the MDAC but a design with gain and more SMD components. It's a great device, I really like it. More details about my journey are in this thread:
http://www.diyaudio.com/forums/anal...-remote-volume-input-control.html#post3882899
http://www.diyaudio.com/forums/anal...-remote-volume-input-control.html#post3882899
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