Author |
Message |
MapacheRaper
Joined: Feb 15, 2018 Posts: 166 Location: Spain
|
Posted: Sun Aug 12, 2018 1:28 am Post subject:
Expert Sleepers DIY way |
|
|
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) |
|
Back to top
|
|
|
AlanP
Joined: Mar 11, 2014 Posts: 746 Location: New Zealand
Audio files: 41
|
Posted: Sun Aug 12, 2018 2:31 am Post subject:
|
|
|
There's a good chance that the soundcard may be AC coupled, and get grumpy about DC control voltages. |
|
Back to top
|
|
|
gabbagabi
Joined: Nov 29, 2008 Posts: 652 Location: Berlin by n8
Audio files: 23
|
|
Back to top
|
|
|
MapacheRaper
Joined: Feb 15, 2018 Posts: 166 Location: Spain
|
Posted: Sun Aug 12, 2018 4:39 pm Post subject:
|
|
|
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!! Last edited by MapacheRaper on Sun Sep 02, 2018 12:43 am; edited 1 time in total |
|
Back to top
|
|
|
MapacheRaper
Joined: Feb 15, 2018 Posts: 166 Location: Spain
|
Posted: Sun Sep 02, 2018 12:37 am Post subject:
|
|
|
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??
Description: |
|
Filesize: |
49.45 KB |
Viewed: |
192 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |
|
Description: |
|
Filesize: |
122.52 KB |
Viewed: |
181 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |
|
|
|
Back to top
|
|
|
MapacheRaper
Joined: Feb 15, 2018 Posts: 166 Location: Spain
|
|
Back to top
|
|
|
gabbagabi
Joined: Nov 29, 2008 Posts: 652 Location: Berlin by n8
Audio files: 23
|
Posted: Sun Sep 02, 2018 1:01 am Post subject:
|
|
|
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
Description: |
|
Filesize: |
589.14 KB |
Viewed: |
169 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |
|
Description: |
|
Filesize: |
607.32 KB |
Viewed: |
181 Time(s) |
This image has been reduced to fit the page. Click on it to enlarge. |
|
|
|
Back to top
|
|
|
MapacheRaper
Joined: Feb 15, 2018 Posts: 166 Location: Spain
|
Posted: Sun Sep 02, 2018 5:17 am Post subject:
|
|
|
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!! |
|
Back to top
|
|
|
gabbagabi
Joined: Nov 29, 2008 Posts: 652 Location: Berlin by n8
Audio files: 23
|
Posted: Sun Sep 02, 2018 5:20 am Post subject:
|
|
|
thx, would be a pleasure!
glhf |
|
Back to top
|
|
|
|