SubContractor Posted October 15, 2008 Report Posted October 15, 2008 Hi AllIm probably asking a really silly question, but is there any reason the cheaper chips like Microchips $2, 2 channel chip MCP4822 ( http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en024016 ) cant be used?RegsAndrew
stryd_one Posted October 15, 2008 Report Posted October 15, 2008 They could be used, but they're not as accurate as the ones that have been chosen for existing MBHP modules. Musically speaking, that equates to playing the wrong pitch......
seppoman Posted October 15, 2008 Report Posted October 15, 2008 Can't be used for what exactly?Sure they could be used for some AOUT stuff, but they're not currently supported by MIOS, they're only two channels and they're around $4 at Digikey in small numbers, so 4 of them wouldn't be really cheaper than the TLV5630 that is used on the AOUT_NG, plus they'd take up more PCB area.Of course there are dozens and hundreds of DACs that could theoretically be used to generate CV voltages, so you're free to layout a suitable PCB and write the necessary new MIOS driver for the DAC of your choice ;)S
stryd_one Posted October 15, 2008 Report Posted October 15, 2008 OK now that seppo has spoken, I will say what I was originally thinking:Trust the people that designed the modules we have now - these were very well thought through and debated. They're the designs we used because they're the best ;)
nILS Posted October 15, 2008 Report Posted October 15, 2008 Except for the Pokey and gm5x5x5 layouts. *whack*
SubContractor Posted October 15, 2008 Author Report Posted October 15, 2008 I was just thinking for filter control with SID - one chip for 2 outs is all that's needed - which could save space and cost, but if they aren't good enough, then that explains it.
seppoman Posted October 15, 2008 Report Posted October 15, 2008 I didn't say their performance is inferior, at least it would be better than with the AOUT_LC module. They're just not really practical for an 8 channel design. For a 2 channel AOUT this DAC would probably be ok, but there's no PCB and no software support for it so you'd need to do all that on your own. For a cheap and basic 2 channel solution I'd recommend using the AOUT_LC module.S
doc Posted October 16, 2008 Report Posted October 16, 2008 Trust the people that designed the modules we have now I'll never trust anybody who 've built a MIDIbox-Sofa ! ;D :D ;DDoc
buhler Posted October 17, 2008 Report Posted October 17, 2008 Except for the Pokey and gm5x5x5 layouts. *whack*what!?!?! crap. now i have to build my POKEY boards all over again. :(
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