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 Forum index » DIY Hardware and Software » Synthasystem
Rack and Roll
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dingebre



Joined: Aug 10, 2008
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PostPosted: Wed Oct 13, 2010 11:03 pm    Post subject: Rack and Roll Reply with quote  Mark this post and the followings unread

I got the first rack assembled and the VCO, VCF, and EG installed. Their placement will change as I build more modules, etc. but for now it's fun to have these three together. I'll really try to get some audio and/or video of the things working.


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_________________
David M. Ingebretsen, M.S., M.E.
Collision Forensics & Enginering, Inc.

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http://www.xmission.com/~dingebre/Synthasystem.html
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v-un-v
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PostPosted: Thu Oct 14, 2010 4:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice to see your feet and toes David! Shocked Laughing Very Happy
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ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
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dingebre



Joined: Aug 10, 2008
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PostPosted: Thu Oct 14, 2010 9:38 am    Post subject: Reply with quote  Mark this post and the followings unread

v-un-v wrote:
Nice to see your feet and toes David! Shocked Laughing Very Happy


Yes, freakishly long. My toes are as long as some peoples fingers! Smile

David

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v-un-v
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PostPosted: Thu Oct 14, 2010 2:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's a beautiful project. I think we're all waiting in anticipation to hear what it sounds like. Cool
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ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN.
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RSFC



Joined: Sep 02, 2010
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PostPosted: Sat Oct 16, 2010 9:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

V-UN-V,
You can hear my build of the VCF here:
http://soundcloud.com/search?q%5Bfulltext%5D=steiner+vcf
Note that there is variation on the self oscillation depending on how loud your input is. My input was loudish on this recording. This is mostly just a Livewire AFG osc straight to filter.
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kjackman



Joined: Sep 05, 2010
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PostPosted: Mon Oct 18, 2010 4:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice and juicy, that filter. Definitely has that typical diode-based, crisp nasal quality a la the TB-303. Would love to hear some bass lines done on that thing.

I like that the response changes with the input somewhat; it's that kind of thing that gives a filter a subjective "character" and sets it apart from other filters. It's the kind of quirk that begs to have music made from it!

This filter is still on my near-term build list (it's probably the first filter I'll build), but I'm just starting out in DIY, and stocking all the parts I'm going to need for that first run of modules is taking longer than I thought it would. I need to knuckle down and order the PCBs from you - but to be honest, they'd just sit in a drawer for the next month or two while I continue filling my parts drawers and obtaining test equipment like an o-scope (yeah, still need one of those, and the one I got on eBay arrived damaged, what a headache).
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v-un-v
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PostPosted: Tue Oct 19, 2010 1:59 am    Post subject: Reply with quote  Mark this post and the followings unread

kjackman wrote:
Nice and juicy, that filter. Definitely has that typical diode-based, crisp nasal quality a la the TB-303. Would love to hear some bass lines done on that thing.


Except that the 303's ladder is transistor based! So is the Steiner I think? (And, correct me if I'm wrong, it's not a ladder either). The Steiner is just unusual because it has high bandpass and low as inputs rather than outputs. The two things that you may be confusing is that the EMS Synthi had a diode ladder with a response of 18 dB/Oct which is also the same as the TB303. That's where the confusion may lie. Smile

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ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN.
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RSFC



Joined: Sep 02, 2010
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Location: space lab

PostPosted: Tue Oct 19, 2010 7:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Kjack,
Yeah, I really like the filter. It can be smooth and very aggressive. You don’t need an oscilloscope to build the filter. Sourcing parts can be a pain, it’s probably my least favorite aspect of DIY. David offers alternative options for hard to find parts. I used individual transistors in the place of the matched pair packages, for instance.
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kjackman



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PostPosted: Tue Oct 19, 2010 1:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh, good point. I'll need the o-scope for the VCO, but I can certainly build the filter first while I wait.
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kjackman



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PostPosted: Tue Oct 19, 2010 1:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

v-un-v wrote:
Except that the 303's ladder is transistor based!


Ah, but the transistors are diode-connected: the bases are tied to the collectors. They act like diodes, although breakdown voltages are (I guess) different than they would be for "regular" diodes (maybe; I'm no EE).

From the schematics (PDF), it looks like the Steiner is indeed diode-based as well. Awesome!
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RSFC



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PostPosted: Wed Oct 20, 2010 3:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

kjackman wrote:
Oh, good point. I'll need the o-scope for the VCO, but I can certainly build the filter first while I wait.


It does self oscillate. Who needs a VCO? Laughing
You can run other stuff through the filter in the meantime.
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