My polysynth is finally finished :D

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filtermod
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Re: My polysynth is finally finished :D

Post by filtermod » Thu Sep 24, 2009 5:28 pm

WOW!
Massive amounts of respect to you! Sounds and looks fantastic.
You should be extremely proud!
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adamstan
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Re: My polysynth is finally finished :D

Post by adamstan » Thu Sep 24, 2009 5:33 pm

I am :-)

If anybody likes to read such things, here are sources for patch-memory and voice-assignement. It's written in BascomAVR. Unfortunately (for most of you ;-) ) the comments are written in polish, as they were primarily for me ;-)

Enjoy

I still want to develop upgraded version of this synth (desktop unit I've mentioned above, featuring 3 oscillators and autotune), but it takes time and money, and I don't have much of it. However, when it's designed, I think I'll try to setup some webpage with documentation (schematics, board layouts and software).
Attachments

[The extension zip has been deactivated and can no longer be displayed.]

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Re: My polysynth is finally finished :D

Post by nathanscribe » Thu Sep 24, 2009 6:26 pm

That sounds very, very good indeed.

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Re: My polysynth is finally finished :D

Post by retrosounds » Fri Sep 25, 2009 1:50 am

It sounds amazing! :D
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Re: My polysynth is finally finished :D

Post by DeFex » Fri Sep 25, 2009 2:35 am

What a great project, and it sounds really good as well
kudos for all the work you did!

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Re: My polysynth is finally finished :D

Post by Ashe37 » Fri Sep 25, 2009 7:12 am

sounds great... i was thinking of building a 2 osc monosynth myself...

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Re: My polysynth is finally finished :D

Post by Operatron » Fri Sep 25, 2009 8:33 am

congratulations , call it - X Apollo
:P

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Re: My polysynth is finally finished :D

Post by Automatic Gainsay » Fri Sep 25, 2009 8:38 am

Congratulations!
It sounds great!
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Re: My polysynth is finally finished :D

Post by Ashe37 » Fri Sep 25, 2009 8:44 am

B-5 was the last of the Babylon synthesizers....

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Re: My polysynth is finally finished :D

Post by adamstan » Mon Oct 19, 2009 5:25 am

Talk about bad luck! Yesterday I was adding second +5V voltage regulator to PSU, as the panel drawn too much current for one 7805, and the voltage dropped to ~4.75V. It was easy task, but after putting everything together I've misconnected mainboard power connector. It's just 5-pin SIL connector, so unfortunately it's easy to reverse it. The problem is, when you do it, you connect +12V in place of +5V. Result - both CPUs are dead #-o :cry: :cry:

Time to design and make new board (CPUs are in TQFP-44 packages and I really don't like the idea of desoldering them as I don't have hot-air gun. Besides, that board needed some design improvements anyway)...
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Re: My polysynth is finally finished :D

Post by computron » Mon Oct 19, 2009 11:59 pm

Thats a great way to look at it adamstan when something goes amiss somewhere while your at it make improvements on something else you where thinking.
All I can say is your d.i.y. synth is awsome and impressive.most is impressive indeed.I like all the patches the bass sounds nice as does the pwm.Excellent job on your poly !!!
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Re: My polysynth is finally finished :D

Post by Stab Frenzy » Tue Oct 20, 2009 12:51 am

Oh man that sucks. I feel your pain, I've done similar things in the past at work with prototypes that have taken me months of work to get right. At least the code's still there to put on a new chip though.

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Re: My polysynth is finally finished :D

Post by adamstan » Wed Mar 17, 2010 11:39 am

Finally I've made new board.

Improvements:
+ LFOs, noise source and their VCAs are now built-in.
+ added third AVR for generating all 15 envelopes :mrgreen:
+ some improvements in code - now it is much more stable


Unfortunately, I've made some mistakes during layout, so the board has many wire-jumpers and additional components :-(

Envelope generators maintain full resolution regardless of envelope amount. It is done by wiring one of the S/H outputs as switchable reference voltage for DAC.

Some photos:

Unfinished board during assembly:
20022010.jpg
Some testing...
26022010.jpg
Vintage test equipment ;-) (everything - scope, power supply, voltmeters - built in late 70's / early 80's)
02032010.jpg
Things to do (on the whole synth):
+ Replace carbon resistors in VCO expo converter input to improve tuning stability - I don't know how could they sneak in - they are resistors connected in series with V/Oct trimpot, so probably I've thought "they have pot in series, so 5% would do fine"... yeah, 5% would do fine, but it has to be metal film resistor... how stupid of me!
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Re: My polysynth is finally finished :D

Post by I12 » Wed Mar 17, 2010 12:07 pm

Great to see it back on track!
Dont bother its not worth it!

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Re: My polysynth is finally finished :D

Post by Synthaholic » Wed Mar 17, 2010 1:00 pm

adamstan wrote:Envelope generators maintain full resolution regardless of envelope amount. It is done by wiring one of the S/H outputs as switchable reference voltage for DAC.
You, sir, are a genius! Perhaps you should patent that technique, if it hasn't been done already. :D
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