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 Forum index » DIY Hardware and Software » YuSynth
S&H Clicking
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synthetic



Joined: Jun 02, 2007
Posts: 76
Location: Glendale, CA

PostPosted: Sun Nov 30, 2008 9:51 pm    Post subject: S&H Clicking Reply with quote  Mark this post and the followings unread

I just finished the Sample and hold/noise module from Bridechamber. I have the default noise going to the S&H circuit. When I turn the slew all the way down, there's a substantial click with every clock pulse. Is this normal?
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synthetic



Joined: Jun 02, 2007
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Location: Glendale, CA

PostPosted: Sun Nov 30, 2008 10:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's an example of the click:

http://www.jefflaity.com/MOTM/yusynth/yu_sh_click.wav
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yusynth



Joined: Nov 24, 2005
Posts: 1234
Location: France

PostPosted: Mon Dec 01, 2008 5:48 am    Post subject: Reply with quote  Mark this post and the followings unread

I suppose that it is the direct sound from VCOs (no filter, no VCA, no EG).

Which PCB are you using ?

I guess that this click depends a bit on the characteristics of Q5, try different BF245 to find one less "clicking". Another thing you may do is to play with the value of C4 (try smaller values down to 1nF)

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synthetic



Joined: Jun 02, 2007
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Location: Glendale, CA

PostPosted: Mon Dec 01, 2008 11:43 am    Post subject: Reply with quote  Mark this post and the followings unread

That audio file is a pair of MOTM 300 oscillators (one FM modulated by the Random out of the board) into a MOTM 490 Moog filter. The filter is FM modulated by the S&H. I'm using a MOTM 190 VCA as an attenuator only.

I purchased the board as part of the full kit from Bridechamber. He shipped me a pair of TL074s instead of a TL074 and a LM324, could this be the problem?
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yusynth



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PostPosted: Mon Dec 01, 2008 12:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

No TL074 are OK
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Yves
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yusynth



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PostPosted: Tue Dec 02, 2008 12:51 am    Post subject: Reply with quote  Mark this post and the followings unread

synthetic wrote:
That audio file is a pair of MOTM 300 oscillators (one FM modulated by the Random out of the board) into a MOTM 490 Moog filter. The filter is FM modulated by the S&H.


OK are you sure that the click you hear is not some kind of CV bleedthrough of your MOTM 490. To check this you can modulate the MOTM490 with a LFO in squarewave mode with a 10Vpp amplitude. In such a case can you hear a clicking ?

Have you got a scope ?

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synthetic



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Location: Glendale, CA

PostPosted: Tue Dec 02, 2008 9:29 am    Post subject: Reply with quote  Mark this post and the followings unread

yusson wrote:
OK are you sure that the click you hear is not some kind of CV bleedthrough of your MOTM 490. To check this you can modulate the MOTM490 with a LFO in squarewave mode with a 10Vpp amplitude. In such a case can you hear a clicking ?

Have you got a scope ?


No clicking when I modulate the 490 with a square wave. No, I don't have a scope.
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yusynth



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PostPosted: Tue Dec 02, 2008 9:59 am    Post subject: Reply with quote  Mark this post and the followings unread

So it rules out CV bleedthrough. No you may try and change the value of C4.

Another thing you could do is to add a 100 ohm resistor in series with the slew rate pot.

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