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 Forum index » DIY Hardware and Software » YuSynth
Pulse-Delay Modification
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guitarfool



Joined: Feb 26, 2007
Posts: 156
Location: Maryland
Audio files: 8

PostPosted: Thu Dec 25, 2008 8:32 pm    Post subject: Pulse-Delay Modification Reply with quote  Mark this post and the followings unread

I built the Pulse Delay module, which works quite well, but had problems with double-triggering on input signals that went slightly negative (falling-edge triggering). Here's a fix to the input that allows proper triggering off of any signal - changes are in red. I just soldered the resistor and diode at the jack rather than adding them to the PCB. Of course this needs to be done at both inputs.

The control ranges for both the delay and pulse width are ideal (for me anyway). At zero setting, the delay seems to be zero, and the max delay is pretty long.

I had been planning on building a module almost identical to this for many years, based on a Forrest Mimms or Don Lancaster (don't rightly recall) circuit app for theCD4538. Thanks Yvonne for saving me the trouble Very Happy


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yusynth



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

PostPosted: Sun Dec 28, 2008 11:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the tip. I have never had this problem which seems to depend on the format of the input signal. I might add this mod on my web page Wink

By the way Jeff, my firt name is Yves because I am a boy. Should I be operated just as Wendy Carlos has been, then you would call me Yvonne, but this is none of my plans Very Happy Very Happy

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Last edited by yusynth on Sun Dec 28, 2008 12:58 pm; edited 1 time in total
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guitarfool



Joined: Feb 26, 2007
Posts: 156
Location: Maryland
Audio files: 8

PostPosted: Sun Dec 28, 2008 12:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sorry - aging brain syndrome Embarassed
I must have those 2 names in adjacent locations in my brain Rolling Eyes
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vcfool



Joined: Jun 19, 2008
Posts: 23
Location: Barcelona

PostPosted: Thu Mar 12, 2009 8:50 am    Post subject: Reply with quote  Mark this post and the followings unread

After building the module I experienced the same problem with some input signals.
Doing this mod seems to have solved the problem.
Thank you both!
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yusynth



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

PostPosted: Thu Mar 12, 2009 10:09 am    Post subject: Reply with quote  Mark this post and the followings unread

This confirms that under certain conditions the input circuit is not behaving.
I am incorporating the input mod on my web page (schemo and PCB design ) ASAP.

Thanks to both of you.

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yusynth



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

PostPosted: Thu Mar 12, 2009 11:51 am    Post subject: Reply with quote  Mark this post and the followings unread

The page has been updated...
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