[sdiy] What;s going on with that dsPIC ?

[cheater00 .]

Hi Mike,
sounds like a meaty synth, got any (line-in) demos?

Also, it sounds like the case build is really doable! Maybe I should
try this one day..

Cheers,
D.

On Mon, May 27, 2013 at 3:03 PM, Michael Bachman <bachmanm50 at gmail.com> wrote:
> D.
>
> Thanks for asking..
>
> Case:
> The case was the real "meat" and most difficult part of this project.
>
> The case is solid oak and was cut on my jigsaw, table saw and router.
> There are many intricate angles on the toe and heal pieces.
> It is built like furniture using glue, pins and clamps.
>
> The curved panel was made by thermoforming  5mm thick plastic over a
> simple mold.  Many plastics will become soft at temperature and I just
> used my oven.  Some people use hot oil in a pan for a more even
> temperature, but I found that far to messy and not necessary.  It took
> a few trys and throw aways before I go this one right.  The 5mm
> thickness allowed enough thickness to drill and tap the holes for all
> the pots and switches.
>
> The panel overlay is a custom printed vinyl to allow it to form over
> the curves.  3M 77 adhesive spray worked great
>
> Controls:
> I just added this explination of the Victorian Synth panel to Flickr
>
> http://www.flickr.com/photos/96442572@N07/8853804646/
>
> Guts:
> The Victorian is a dual ramp core oscillator, each with a sub octave
> generator.  The oscillaors have hard sync and are sent to a simple
> ring modulator.    A dedicated LFO provide vibrato to osc 1 and
> provides some nice sweeping effects during hard sync
>
> The mixer section has individual levls for all 5 sources above plus white noise.
>
> The filter is a 2 pole low pass with resonance and has its own ASR and
> velocity mod input.  It also has a dedicated LFO for cut-off
> modulation.
>
> The output stage has a BBD analog delay line with feedback and a basic
> VCA with a dedicated ADSR.  Velocity is used to control the ADSR
> modulation level.
>
> The Voice Card is not in this synth but will find its way into  a
> version 2 and a few other instruments that only exist in my head and
> in 3D CAD at this point.
>
> It was a fun build and I am very happy with the one-of-a-kind result
>
> Mike.
>
> On Sun, May 26, 2013 at 9:25 PM, cheater00 . <cheater00 at gmail.com> wrote:
>> I really like the case on that "victorian" synth. How did you make it?
>> Pretty cool!
>>
>> Got some pics of the front panel? I wonder what parameters you went with.
>>
>> Can you tell us a bit more about the architecture of the synth?
>>
>> Also, what is the "sound card"? Is it part of the "victorian"?
>>
>> D.
>>
>> On Mon, May 27, 2013 at 2:08 AM, Michael Bachman <bachmanm50 at gmail.com> wrote:
>>> Tom asked to see a few pix of what state my DIY project(s) are in...
>>> well, I'm still working out all the bugs on the sound card, but I
>>> uploaded some progress to date and the project I just finished to
>>> Flickr.
>>>
>>> Take a look if you are curious.. I'll keep updating that set as I progress.
>>>
>>> This PCB is a rough one as it is the "debug board".. there was alot of
>>> talk about proto baords and vector boards etc on th email list this
>>> week.. For me, on something this big, I like to go straight to PCB..
>>> yes it is more difficult to change values, but I don't have to wonder
>>> if it is the design or the proto board when I am debugging.  And when
>>> it's done, it is easy to duplicate it to a "clean" copy and use it in
>>> a synth (I have 6 PCBs)
>>>
>>> http://www.flickr.com/photos/96442572@N07/sets/72157633698055196/
>>>
>>> Mike
>>>
>>> On Sat, May 25, 2013 at 7:20 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
>>>> Sounds like a nice project. Have you got any pictures we can see?
>>>>
>>>> Good luck with it either way,
>>>>
>>>> Regards,
>>>> Tom
>>>>
>>>> On 26 May 2013, at 00:13, Michael Bachman <bachmanm50 at gmail.com> wrote:
>>>>
>>>>> Guys
>>>>>
>>>>> I use the dsPIC30F4013.. it is a 40 pin DIP.  Although a bit more costly,
>>>>> this series has the built-in EEPROM and runs on standard +5v.
>>>>>
>>>>> In my current project, the PIC runs a dual 12 bit DAC for oscillator
>>>>> output/control, uses the 4 PWM generators to produce control voltages
>>>>> (after some Bessel filters) for PWM modulation, Filter frequency, Q and
>>>>> VCA  and there are still pins for MIDI in/out, control pots, selector switches
>>>>> and the LCD interface.
>>>>>
>>>>> have fun
>>>>>
>>>>> Mike
>>>>> _______________________________________________
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>>>>
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