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The Synthasystem Discussion and Appreciation Thread
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Author The Synthasystem Discussion and Appreciation Thread
Rod Serling Fan Club
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PostPosted: Sun Mar 04, 2012 1:20 pm    Post subject: Reply with quote Add User to Ignore List

diophantine wrote:
Rod Serling Fan Club wrote:
diophantine wrote:

I have also finished building a Triple EG - EGs 1 & 3 work great, but EG2 seems busted... I need to debug more, but I think it is a bad cap. Anyhow, it seems to be a really cool module!


Odd I have the same problem with mine. Please let me now what you find. I am curious to see how your 3eg panel w/bananas since there is some normalization.

Curiouser and curiouser... how does your EG2 behave? Mine just outputs a gate, as if Attack=0 & Decay=0. The level is affected by the Duration Level pot, but the Attack and Decay pots don't do anything (nor do any of the switches).



It's been a while since I played with it. That system isn't set up at the moment but I've started working on it again. I will let you know when I get back to it.

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Rod Serling Fan Club
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PostPosted: Sat Mar 10, 2012 9:05 pm    Post subject: Re: The Synthasystem Discussion and Appreciation Thread Reply with quote Add User to Ignore List

Isaiah wrote:


VCO - LINEAR FM
I spoke to Dr. Sketch-n-Etch a while ago about the possibility of implementing Linear FM on the Synthasystem VCOs.
Referring to the VCO A schematic:
Dr. Sketch-n-Etch wrote:
I'm not completely sure I understand the functioning of this oscillator completely, but I'm pretty sure that I know how to apply Linear FM.

Basically, you should try sending an attenuated signal through an 8.2k resistor in parallel with R14 into the common emitters of Q6. I believe that R14 sets the servo current into the VCO core, so modulating this current should give you Linear FM.

Give it a try and let me know how it works.




I got back to completing my VCO and thought I'd try the lin fm mod. Just to make sure I understand: Just solder another 8.2k from the input jack to the point on the PCB where R14 connects to the emitters of Q6?

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Isaiah
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PostPosted: Sun Mar 11, 2012 4:56 am    Post subject: Reply with quote Add User to Ignore List

Yes, connect to the junction where R14 joins the Emitters of Q6.
Could also try decoupling the input signal with a capacitor first too. AC/DC Lin FM.

I'd maybe connect a pot as a variable resistor in series with the 8.2K.
Though a variable potential divider might work too, I just have a feeling that the Lin FM input should be 'floating' like the Var. CV input on the VCO.

Very interested to hear how you get on with it!
Hope it works well!
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Isaiah
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PostPosted: Fri Mar 16, 2012 3:35 am    Post subject: Reply with quote Add User to Ignore List

RSFC
Did you have any joy with the Lin FM mod?
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MechaSeb
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PostPosted: Fri Mar 16, 2012 6:13 am    Post subject: Reply with quote Add User to Ignore List

Just received two of my big orders. One from David himself and the other from FPE. David is really professional and it's a pleasure to deal with. First time i receive something from FPE too but it blew my mind how the front panel are quality made. Really happy for the moment !

Wil post some ugly pics tomorrow just for fun.

Edit : here they are













Isaiah wrote:
RSFC
Did you have any joy with the Lin FM mod?


would like to know too thumbs up

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Rod Serling Fan Club
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PostPosted: Fri Mar 16, 2012 9:40 am    Post subject: Reply with quote Add User to Ignore List

MechaSeb wrote:


Isaiah wrote:
RSFC
Did you have any joy with the Lin FM mod?


would like to know too thumbs up


I added the mod but I haven't tried it yet. The module wired and ready to go but I am missing the trimmer for the high-freq tracking PCB. I might calibrate this weekend and install the hi-freq tracking later. I'll let you know.

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Isaiah
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PostPosted: Fri Mar 16, 2012 11:41 am    Post subject: Reply with quote Add User to Ignore List

MechaSeb wrote:
Just received two of my big orders. One from David himself and the other from FPE. David is really professional and it's a pleasure to deal with. First time i receive something from FPE too but it blew my mind how the front panel are quality made. Really happy for the moment !


Wowee zowee, congratulations!
That'll keep you busy for a while! eek!
I couldn't agree more about David, such a gentleman.
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Isaiah
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PostPosted: Sat Mar 17, 2012 9:03 am    Post subject: Reply with quote Add User to Ignore List

Rod Serling Fan Club wrote:
MechaSeb wrote:


Isaiah wrote:
RSFC
Did you have any joy with the Lin FM mod?


would like to know too thumbs up


I added the mod but I haven't tried it yet. The module wired and ready to go but I am missing the trimmer for the high-freq tracking PCB. I might calibrate this weekend and install the hi-freq tracking later. I'll let you know.


Exciting!
How did you decide to implement the mod?
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e-grad
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PostPosted: Sat Mar 17, 2012 9:12 am    Post subject: Reply with quote Add User to Ignore List

Any first hand experiences on the Triple EG?

How does it compare to function generators such as the Buchla 281?

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diophantine
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PostPosted: Sat Mar 17, 2012 8:35 pm    Post subject: Reply with quote Add User to Ignore List

e-grad wrote:
Any first hand experiences on the Triple EG?

How does it compare to function generators such as the Buchla 281?


I actually just finished debugging the second EG earlier this afternoon (was a busted pad!). w00t I haven't played around with a whole lot, but a bit.

It is something of a hybrid between a traditional ADSR and a AD/AR, but with a number of extra & interesting features. Not sure if I'd compare it to a 281, but they do both allow AD and AR (though AR just on EG3), and you can combine envelopes.

Triple EG allows for more ADSR-style envelopes, but with less knob-fiddling than traditional ADSRs. It also allows a fixed sustain time on EG3, and delays on EGs 2 & 3. The damp & qtn functions also allow for the creation of interesting envelopes.

281 has the quadrature mode, CV attack/decay, repeat mode, and trigger output.

I think they're both interesting & worthwhile! I am considering building both into my MU modular, even.

It has been a while since I've seen it, but I seem to recall that in this video David did shows most all the features of the Triple EG:
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e-grad
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PostPosted: Mon Mar 19, 2012 9:16 am    Post subject: Reply with quote Add User to Ignore List

Thanks!

I've still some 281 in the pipeline and have finished one 281 which is a blast. At least for the kind of stuff I do.

However, the Triple EG seems to add some really unique features which would blend nicely with my system. ATM I must resist but guess I'll end up with one Triple EG.

Nice work, David! Thanks for making it available.

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Rod Serling Fan Club
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PostPosted: Tue Mar 20, 2012 12:44 pm    Post subject: Reply with quote Add User to Ignore List

I wonder if there would be any interest in a group buy of MPC euro panels for the synthasystem? Right now my panels are etched but I wouldn't mind some professional panels if there was enough interest to make it feasible.

They would be the standard euro-silver (aluminum) color with black print. This is also how the earlier synthasystems looked.

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Isaiah
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PostPosted: Tue Mar 20, 2012 1:05 pm    Post subject: Reply with quote Add User to Ignore List

RSFC
Sounds like a good idea!


I'll post photos of my panels soon.
I used David's FPD files and had them machined by thebeast.co.uk on natural aluminium with black in-fill.
They look very handsome!

I have an alternative VCO A panel that I made using David's as my starting point.
It's much more like the early, silver Synthasystems.
I'll check with David, but I'm sure he won't mind me posting it.
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Isaiah
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PostPosted: Wed Mar 21, 2012 2:54 pm    Post subject: Reply with quote Add User to Ignore List

David announced the Duophonic Keyboard project here:

www.electro-music.com/forum/topic-52687.html

Rockin' Banana!
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Rod Serling Fan Club
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PostPosted: Wed Mar 21, 2012 6:06 pm    Post subject: Reply with quote Add User to Ignore List

Isaiah wrote:
Rod Serling Fan Club wrote:
MechaSeb wrote:


Isaiah wrote:
RSFC
Did you have any joy with the Lin FM mod?


would like to know too thumbs up


I added the mod but I haven't tried it yet. The module wired and ready to go but I am missing the trimmer for the high-freq tracking PCB. I might calibrate this weekend and install the hi-freq tracking later. I'll let you know.


Exciting!
How did you decide to implement the mod?


I got started on trimming the VCO last night. I'm not done but I tried both FM inputs. I think the suggested resistor value is too high, it was FMing it through the linear mod but it was doing so as if it was very attenuated and there was no attenuation. exp FM and the oscillator in generaly sounds very nice so far.

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PostPosted: Thu Mar 22, 2012 5:38 am    Post subject: Reply with quote Add User to Ignore List

I really do love the VCO, David has it right that Nyle outdid himself with that design. Next to my Z3000 it's the one I go to most often and it never disappoints me. It tracks very well (even without the hi-freq tracking PCB, which I received after the fact and have not installed) and it always manages to sound alive no matter the waveform I use. The sawtooth cuts like a knife. I think I'll leave this one in my general Euro racks even when I pull the trigger on the standalone 9U I'm planning.

(I sent my case pattern off to my woodworker buddy a short while back so the wheels are finally turning... we bought some nice curly maple for it - exciting times!)

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Isaiah
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PostPosted: Thu Mar 22, 2012 1:51 pm    Post subject: Reply with quote Add User to Ignore List

Rod Serling Fan Club wrote:

I got started on trimming the VCO last night. I'm not done but I tried both FM inputs. I think the suggested resistor value is too high, it was FMing it through the linear mod but it was doing so as if it was very attenuated and there was no attenuation. exp FM and the oscillator in generaly sounds very nice so far.



Glad to hear your VCO is working and the Lin FM mod works (to some degree).
How does the Lin FM sound?
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Rod Serling Fan Club
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PostPosted: Thu Mar 22, 2012 2:13 pm    Post subject: Reply with quote Add User to Ignore List

very attenuated hihi

It’s hard to tell at that level. I need to finish adjusting trimmers and then get back to it. I might just try it without a resistor at all and work back from there.

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Rod Serling Fan Club
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PostPosted: Thu Mar 22, 2012 2:14 pm    Post subject: Reply with quote Add User to Ignore List

double post
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bleeps
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PostPosted: Sun Mar 25, 2012 12:38 pm    Post subject: Reply with quote Add User to Ignore List

I have some questions about the VCO-A. I'm looking for a solid DIY VCO for subtractive synthesis and I think this one will fit the bill. But, I want to slim down the panel or perhaps fit 2 or 3 behind a panel the same size as the traditional panel. Would I be missing out on any of the core features or patching potential if I did the following:
1) One output jack per waveform
2) Removed the waveform output attenuators
3) Reduced the number of CV inputs to one jack

I'm also curious about the Selective Inverter. That sounds like it could be fun to play with.
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