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 Forum index » DIY Hardware and Software » YuSynth
SOLVED -S&H/Noise- Normal for a clipping Pink/Random output
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hububalli



Joined: Feb 15, 2014
Posts: 39
Location: UK

PostPosted: Thu Jan 31, 2019 4:43 am    Post subject: SOLVED -S&H/Noise- Normal for a clipping Pink/Random output Reply with quote  Mark this post and the followings unread

Hello again everybody, finally got some more time to carry on with my YuSynth build and have another question for you!

The images say it all really. The White noise looks and sounds fine to me but the pink and random are clipping. Is this the expected behaviour?

Thanks,


White
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Pink
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Random
Posted Image, might have been reduced in size. Click Image to view fullscreen.[/img]

Last edited by hububalli on Sun Feb 03, 2019 2:18 pm; edited 1 time in total
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gabbagabi



Joined: Nov 29, 2008
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PostPosted: Thu Jan 31, 2019 11:45 am    Post subject: Reply with quote  Mark this post and the followings unread

if (link to schematic)
++probability of help
else
device null
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Grumble



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PostPosted: Thu Jan 31, 2019 1:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

I couldn’t say it better sigh
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Blue Hell
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PostPosted: Thu Jan 31, 2019 5:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

But then again .. to answer the question ... this clipping is not what I'd want to see from a noise generator Wink

For as to why it happens .. see the above two replies. Exclamation

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Jan
also .. could someone please turn down the thermostat a bit.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
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wackelpeter



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PostPosted: Fri Feb 01, 2019 1:13 am    Post subject: Reply with quote  Mark this post and the followings unread

You might want to Play around with the values of R27 and R31 to adjust the Levels as described in the schematics. Reduce them all a bit, try something like 430K, 390K or something like that for R27 for example.

you can easily figure the desired value out by just attaching another bigger resister in parallel to the existing one and then calculate the needed final resistor value. Just saying before you start soldering in and desoldering resistors a couple of times and accidentally Messing up the board (lifting up solder Points etc.) after several times.

Edit:

As have others mentioned before, please do post a link to the schematics next time, this will drastically improve the helping efforts. Wink

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AlanP



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PostPosted: Fri Feb 01, 2019 2:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Honestly, my first thought would be a wrong resistor value in an opamp amplifier section.
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hububalli



Joined: Feb 15, 2014
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PostPosted: Fri Feb 01, 2019 6:31 am    Post subject: Reply with quote  Mark this post and the followings unread

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hububalli



Joined: Feb 15, 2014
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PostPosted: Fri Feb 01, 2019 6:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Weird, last post just appeared blank

http://yusynth.net/Modular/Commun/NOISE/NoiseSH-sch.jpg

Thanks for the replies. I have checked all the components again and all is correct.

The testing with parallel resistors was a handy tip, thanks Wackelpeter!

For the pink noise I had to use a 100k in parallel with the 470k to remove the audible popping. I have replaced the 470k with 82k.

This improved the random output so didn't see the need to replace R31.

I also replaced R34 with 300k to bring the white noise level down a bit.

New White
Posted Image, might have been reduced in size. Click Image to view fullscreen.

New Pink
Posted Image, might have been reduced in size. Click Image to view fullscreen.

New Random
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Do you think these results are acceptable? Roughly, 23v PP on the white noise, 12v PP on the pink, and 17v PP on the random, these are at the most extreme +- peaks.

Thank for all the advice, really appreciate it.
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Blue Hell
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PostPosted: Fri Feb 01, 2019 10:48 am    Post subject: Reply with quote  Mark this post and the followings unread

Thats more like it .. and with those levels I'd think you to have plenty of signal .. way more than my formant ever did :-)
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also .. could someone please turn down the thermostat a bit.
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AlanP



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PostPosted: Fri Feb 01, 2019 10:59 am    Post subject: Reply with quote  Mark this post and the followings unread

As long as it is not clipping, you can always attenuate it during use Smile
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hububalli



Joined: Feb 15, 2014
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PostPosted: Sun Feb 03, 2019 2:18 pm    Post subject:   Reply with quote  Mark this post and the followings unread

Great! Another one to add to the finished pile. Very Happy 8 left to go.

Thanks again all,
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