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

[Michael Bachman]

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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