[sdiy] New digital synthesis projects under way

[Eric Brombaugh]

Thanks Tom.

I'd recommend getting some experience with SMD and this board would 
probably be fine for a beginner - the ICs are all fairly coarse 50mil 
pitch and the main difficulty would probably be the 0603 caps. Once 
you've got a fine-tip iron, some good tweezers and a magnifying 
glass/light you'll be most of the way there.

One other caveat - I'm using SMD electrolytics for the first time on 
this board. I snagged the footprints from John Luciani's site and 
tweaked the pads to extend out beyond the edge of the plastic carrier in 
order to make hand soldering a bit easier. Hopefully that will work out 
OK - If not I may spin the layout.

Eric


Tom Wiltshire wrote:
> I definitely agree, nice job Eric. It isn't hard to think of ten things 
> to do with either of those.
> 
> That dsPIC audio DAC board looks like it could ease me into SMD. I've 
> been using that chip as you know, but I've shied away from the SMD 
> packages. Having a known-good board to get me started might be a way in 
> for me.
> 
> Thanks for sharing your work,
> 
> Regards,
> Tom
> 
> On 21 Jun 2009, at 22:42, Csaba Zvekan wrote:
> 
>> Good Job Eric,
>>
>> I like the dsPIC signal processing board. Looks very promising !
>>
>> Thanks
>>
>> Csaba
>>
>> On Jun 21, 2009, at 11:11 PM, Eric Brombaugh wrote:
>>
>>> I've got a couple of new boards in the works that I've just sent off 
>>> for fab. The first one is here:
>>>
>>> http://members.cox.net/ebrombaugh1/synth/dsPIC_sp/index.html
>>>
>>> It's designed for signal processing & effects and features a dsPIC 
>>> coupled with a stereo codec. It provides stereo audio I/O, 4 CV 
>>> inputs, on-board expansion SRAM and EEPROM for parameter storage as 
>>> well as expansion ports for switches, blinky lights & other off-board 
>>> stuff.
>>>
>>> The second one is here:
>>>
>>> http://members.cox.net/ebrombaugh1/synth/dsPIC_adac/index.html
>>>
>>> It uses a dsPIC with integrated stereo audio DAC. Also included is an 
>>> external EEPROM, 4 CV inputs, a MIDI input port and off-board I/O. I 
>>> foresee using it for oscillators, generators and small form-factor 
>>> MIDI synths.
>>>
>>> I should have some boards back in a few weeks. Once I get them up and 
>>> running I'll put some more content on the web pages, including some 
>>> skeleton firmware projects and additional design materials.
>>>
>>> Comments welcome!
>>>
>>> Eric
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>>
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