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M17-Project / Module_17

M17 modem board for 9600-baud capable radios
CERN Open Hardware Licence Version 2 - Weakly Reciprocal
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Digital potentiometer out of stock everywhere #7

Closed ManoDaSilva closed 1 year ago

ManoDaSilva commented 1 year ago

Hi!

Amazing work you've been doing on developing this modem to get as many people as possible going with M17! I'm preparing an order with JLCPCB, with assembled components, etc. I'm now looking for the digital potentiometers, however it's out of stock everywhere. Is there a suitable replacement I can look for? Or is there a way to replace it with a physical potentiometer to manually adjust the filters? How does openRTX interact with those?

Thanks for the help!

Manoel - ON6RF

silseva commented 1 year ago

Hi! Digital potentiometers are used to regulate the level of the audio signal to and from the radio. You can replace those with physical ones without problems, the only issue you'll have is that the levels set on the UI will not be effective.

73, Silvano IU2KWO

sp5wwp commented 1 year ago

My proposal is to use 50k ones for both U8 and U9. 50k ones are available at Mouser. And change the R42 to 10k.

sp5wwp commented 1 year ago

Will be fixed in revision 0.1e

sp5wwp commented 1 year ago

Done.