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 Forum index » DIY Hardware and Software
Expert Sleepers DIY way
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MapacheRaper



Joined: Feb 15, 2018
Posts: 90
Location: Spain

PostPosted: Sun Aug 12, 2018 1:28 am    Post subject: Expert Sleepers DIY way Reply with quote  Mark this post and the followings unread

I have one 4 IN 4 OUT soundcard that I would like to turn it into an experts sleepers sort of module to interface the computer with the modular

Im guessing that I would need 2 TL074s to buffer the ins and outs. 100k impedances in the ins, 1K in the outs and trimming the opamps for +-10v ranges in the outs and +-1V in the ins. I´d be using only the +ins of the opams, the inverters should go to ground.

Is that correct?

Could I use just voltage dividers for the ins and just buffer the outs?. If you have tips or suggestions about building something like this it would be very appreciated. Im quite a newbie and I dont want to magicsmoke the soundcard.

The soundcard is a MAYA 44, but I guess all then works in more or less the same fashion/voltages, probably around 1 to 3v maximum (targeting 1v for security)
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AlanP



Joined: Mar 11, 2014
Posts: 519
Location: New Zealand
Audio files: 31

PostPosted: Sun Aug 12, 2018 2:31 am    Post subject: Reply with quote  Mark this post and the followings unread

There's a good chance that the soundcard may be AC coupled, and get grumpy about DC control voltages.
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g.gabba



Joined: Nov 29, 2008
Posts: 420
Location: berlin
Audio files: 23

PostPosted: Sun Aug 12, 2018 8:05 am    Post subject: Reply with quote  Mark this post and the followings unread

outputwise there is a guy on MW who did it with a cheap usb soundcard
https://www.muffwiggler.com/forum/topic-162610.html
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MapacheRaper



Joined: Feb 15, 2018
Posts: 90
Location: Spain

PostPosted: Sun Aug 12, 2018 4:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

I didn´t thought in th DC coupling at all.

The diamond soundcard experiemtn is exactly the same idea. You have saved me a ton of time again.

Thanks!! Wink

Last edited by MapacheRaper on Sun Sep 02, 2018 12:43 am; edited 1 time in total
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MapacheRaper



Joined: Feb 15, 2018
Posts: 90
Location: Spain

PostPosted: Sun Sep 02, 2018 12:37 am    Post subject: Reply with quote  Mark this post and the followings unread

So I have built this. The idea is to buffer the audio inputs and amplify it to eurorack levels.

When I breadboarded it I would swear it was working, but now Im getting half of the amplitude of the signal instead of multiplying x4 as it should.

What Im messing??


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MapacheRaper



Joined: Feb 15, 2018
Posts: 90
Location: Spain

PostPosted: Sun Sep 02, 2018 12:49 am    Post subject: Reply with quote  Mark this post and the followings unread

The frontal. Lasercutted on wood


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g.gabba



Joined: Nov 29, 2008
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PostPosted: Sun Sep 02, 2018 1:01 am    Post subject: Reply with quote  Mark this post and the followings unread

try this
with the resistor combination of 100k/390k the opamp will amplify the signal by 4,9.
if you need the factor 4 you should use 100k/300k or 33k/100k.

GL


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MapacheRaper



Joined: Feb 15, 2018
Posts: 90
Location: Spain

PostPosted: Sun Sep 02, 2018 5:17 am    Post subject: Reply with quote  Mark this post and the followings unread

g.gabba wrote:
try this
with the resistor combination of 100k/390k the opamp will amplify the signal by 4,9.
if you need the factor 4 you should use 100k/300k or 33k/100k.

GL


Yeah, that´s it. If someday you come to Spain I´ll invite you to some gallons of beer.

Thanks!!
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g.gabba



Joined: Nov 29, 2008
Posts: 420
Location: berlin
Audio files: 23

PostPosted: Sun Sep 02, 2018 5:20 am    Post subject:   Reply with quote  Mark this post and the followings unread

thx, would be a pleasure!
glhf
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