Mission Cyrus Pre - A DIY Digital Volume Control |
May 27, 2010 at 02:11 PM |
Page 4 of 6
Populating the board was not progressing without issues ... never was aware before, that relay coils can't be used bi-drectional, of course I did reverse their polarity  Pragmatic solution is to populate the relays at the bottom layer side.

The populated PCB mounted into the Pre housing, ready for testing:

First testing is done with an additional preamp in front of the amplifier (might get loud if the volume control behaves unexpectedly), Success! Both channels are working, balanced mode is OK too. Next step is to fine-tune the volume characteristics.
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Last Updated ( Dec 06, 2011 at 12:01 AM )
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