My polysynth is finally finished :D

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My polysynth is finally finished :D

Postby adamstan » Wed Oct 01, 2008 2:35 pm

After almost 2 years of work, I've finished my DIY polysynth :D :D It is based on various module designs available on the net.
I consider it to be a "Poor mans Memorymoog" with a little bit of Prophet 5 thrown in ;-). It features:
- 5 voices
- 2xVCO per voice
- 3xEG per voice (hardwired to pitch, cutoff and volume)
- 3xLFO (pitch, cutoff and PWM)
- Moog ladder VCF
- Noise source
- Ring Modulator
- Patch memory (128 user patches)
- MIDI
- Mono mode with selectable note priority (High/Low) and triggering (single/multi) and with portamento
- unison with adjustable detuning
VCO A offers sawtooth, square and triangle. VCO B offers sawtooth and square waves. Having triangle wave available is essential if you want to obtain some nice fm-like sounds from RingMod.

It's built using only standard off-the-shelf components - no CEM or SSM or similar chips inside - only typical opamps, switches, transistors etc.

Case (together with keyboard) was salvaged from some crappy 70's combo organ.

Here it is sitting on a stand (photo made with phone - sorry ):
Image

With front panel lifted up:
Image

With keyboard lifted up (showing voicecards):
Image

Main digital board (keyboard scan, voice assignement and patch memory):
Image

Voicecards close-up:
Image

Front panel close-up:
Image

MP3 demos:
http://ensoniqsq2.republika.pl/b5demo.html

alternative link: http://share.ovi.com/channel/adamstan.synthdemos

It is noisy and tuning drifts a little bit, but hey, isn't that what we love vintage synths for? ;-)
Last edited by adamstan on Wed Oct 01, 2008 10:22 pm, edited 1 time in total.
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Re: My polysynth is finally finished :D

Postby Synthaholic » Wed Oct 01, 2008 2:48 pm

Cool!

Is that digital board out of another synth? Or is it something you had custom made? Did you create the firmware too?

I think it would be cool to build a synth from scratch someday, but I'll probably stick with a mono synth with no patch memory. :)
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Re: My polysynth is finally finished :D

Postby adamstan » Wed Oct 01, 2008 2:53 pm

I've designed all boards and writen firmware for it. On the mainboard there are two ATMEGA32 CPUs. One is responsible for patch memory, another for voice assignement.

EGs are also digital. EG1 & EG2 are based on Tom Wiltshire's design using PIC16F684 micro's ( http://www.tomwiltshire.co.uk ), while EG3 was designed by me and uses ATMEGA16 MCU. I had to do it because I fried one EG board (by misconnecting power) and couldn't afford ordering new one.
Last edited by adamstan on Wed Oct 01, 2008 2:54 pm, edited 1 time in total.
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Re: My polysynth is finally finished :D

Postby wiss » Wed Oct 01, 2008 2:53 pm

=D> awesome
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Re: My polysynth is finally finished :D

Postby esqoner » Wed Oct 01, 2008 3:04 pm

way cool!!

i'll listen to demos once i get home!

diggin the organ style reversy keys! do they have any special function?
Last edited by esqoner on Wed Oct 01, 2008 3:05 pm, edited 1 time in total.
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Re: My polysynth is finally finished :D

Postby soundxplorer » Wed Oct 01, 2008 3:05 pm

Extreme coolness :o
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Re: My polysynth is finally finished :D

Postby adamstan » Wed Oct 01, 2008 3:07 pm

esqoner wrote:diggin the organ style reversy keys! do they have any special function?


They were for bass section in the organ which the keyboard comes from.
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Re: My polysynth is finally finished :D

Postby Jack Spider » Wed Oct 01, 2008 3:23 pm

A fantastic build - it sounds nifty too!! Top marks!
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Re: My polysynth is finally finished :D

Postby Bitexion » Wed Oct 01, 2008 3:24 pm

You sir, is God.

Designing your own polysynth AND making all the software..can I touch you?
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Re: My polysynth is finally finished :D

Postby Stab Frenzy » Wed Oct 01, 2008 3:27 pm

I'm very impressed, well done!
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Re: My polysynth is finally finished :D

Postby urgetoplay » Wed Oct 01, 2008 3:29 pm

Wow. Kudos. 8)
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Re: My polysynth is finally finished :D

Postby clubbedtodeath » Wed Oct 01, 2008 3:38 pm

Wow. Sounds great, too. Congratulations.
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Re: My polysynth is finally finished :D

Postby Blue Monster 65 » Wed Oct 01, 2008 3:39 pm

Very nice! Impressive work, sir.

Of course, the next step will be to implement all the suggestions/wants that everyone will start to post next. :)

Congrats on your terrific instrument.

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Re: My polysynth is finally finished :D

Postby Vxster » Wed Oct 01, 2008 3:43 pm

Outstanding! What are you going to call it? :)
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Re: My polysynth is finally finished :D

Postby adamstan » Wed Oct 01, 2008 3:47 pm

Vxster wrote:Outstanding! What are you going to call it? :)


I don't know. Currently it announces itself during power-up as "B-5" (combo organ mentioned earlier was B-1, and this thing has 5 voices, so... ;-) )

If anybody has idea for a name for this synth, please post here :-)

I'm glad you like it :D
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