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 Forum index » DIY Hardware and Software » fonik's place
SSM2044 PCBs - 2nd run.
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werock



Joined: Oct 12, 2010
Posts: 3
Location: London

PostPosted: Tue Apr 19, 2011 1:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

Bit of a long shot, but has anyone got one of these boards they would be willing to part with? Maybe 1 or 2 tucked away at the bottom of your to-do pile...
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o-live



Joined: Aug 14, 2012
Posts: 25
Location: france

PostPosted: Thu Aug 23, 2012 6:54 pm    Post subject: eurorack Reply with quote  Mark this post and the followings unread

hello

what is needed to change for eurorack (+12 -12 v ) application ?

also on schematic you talk about tl084 aop but in part list it's tl074
wich aop i need please ?

thank you so much for your help
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LFLab



Joined: Dec 17, 2009
Posts: 191
Location: Rosmalen, Netherlands

PostPosted: Fri Aug 24, 2012 5:13 am    Post subject: Reply with quote  Mark this post and the followings unread

TL074 and TL084 are functionally the same for our applications, as is TL064, the difference is in power consumption, noise and offset, but I wonder if the difference is at all noticeable.

As for PSU voltage, I think mine is running at +/-12v without a problem. Not sure which incarnation of the SSM2044 filter this is, but you have to make sure you tie the low end side of the cutoff pot with a resistor to V- instead of ground. This increases the range, and improves the filter a lot.
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fonik



Joined: Jun 07, 2006
Posts: 3759
Location: Germany
Audio files: 23

PostPosted: Fri Aug 24, 2012 5:33 am    Post subject: Reply with quote  Mark this post and the followings unread

for 12V you can optimize the CV response of this circuit by changing only a few components values:

R16=100K
R11=180K
R15,R15'=22k

refer to sounds post from 2006. he achieved 16hz to 16Khz!

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o-live



Joined: Aug 14, 2012
Posts: 25
Location: france

PostPosted: Fri Aug 24, 2012 3:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

ok for the Aop thank you

and sorry i don't have see the 2006 post i go to directly Wink
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o-live



Joined: Aug 14, 2012
Posts: 25
Location: france

PostPosted: Tue Aug 28, 2012 5:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

hello Mathias

i have a question about the gain in input or output

it's possible to have more gain (like a distortion)

wich component (resistor) i need to change ?

i have quite finish the module ,it was hard to find at good price the tempco Laughing

thank you so much
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o-live



Joined: Aug 14, 2012
Posts: 25
Location: france

PostPosted: Thu Aug 30, 2012 5:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

hi

for more gain on input i think i can change r13 and connect directly a volume pot 50k

soldering it's finished and i have turn on the module ,and i have an issue

resonnance doesn't work correctly and i search search for wich reason when i turn pots i listen some changement but no resonnances ,just filtering .

i have try to set the trimpot of feedback (self osc) the sound come loud to thin

can you help me for know wich value (v) i need to read on different point of circuit please

in entry i have exactly 12.6v -12,3v

on tl074 11.75v -11.66v
on pin 1 have only 1.71v (with resonnace pot at max and trim pot open if i close i have 0v)

in pin 2 of ssm 2044 i have 1,71v

now i don't know where i need to search

thank for you help Wink
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