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 Forum index » DIY Hardware and Software » YuSynth
Problems with S&H/Noise module
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roman_f



Joined: Jul 03, 2007
Posts: 64
Location: Moscow
Audio files: 1

PostPosted: Tue Sep 27, 2011 3:33 pm    Post subject: Problems with S&H/Noise module
Subject description: WEIRD S&H
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i got a Random module pcb + parts kit from Bridechamber
i've assembled it and all sounded good, then i soldered off the wires to wash off the flux from the pcb and install all the hardware into panel

afted that i've assembled it 2nd time and now the s&h module works pretty weird
please take a listen

it's white noise into s&h, and s&h into 1V/Oct input of Q106 oscillator
the square wave out from Q106, the Range is 4'
sample rate on S&H is 7.5 and then i tweak it a bit
slew rate on S&H is 0

i've double checked all the wires and connections - all is fine
but it sounds this way :/


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Mongo1



Joined: Aug 11, 2011
Posts: 411
Location: Raleigh NC

PostPosted: Wed Sep 28, 2011 6:48 am    Post subject: Reply with quote  Mark this post and the followings unread

Hmmm,

I wonder if maybe there is some water in places you can't see it.
If you have a hair dryer you might try blowing it dry and see if that helps.

Gary
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roman_f



Joined: Jul 03, 2007
Posts: 64
Location: Moscow
Audio files: 1

PostPosted: Wed Sep 28, 2011 3:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

i don't think so - i've dryed the pcb before use

anyway i've burned the 074 today, when installed it backwards
there was a loud pop and the IC has a crackle on top, i think the other S&H IC is also dead now
should i also replace the transistors?

the Noise section still works good btw
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Mongo1



Joined: Aug 11, 2011
Posts: 411
Location: Raleigh NC

PostPosted: Wed Sep 28, 2011 4:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
anyway i've burned the 074 today, when installed it backwards
there was a loud pop and the IC has a crackle on top, i think the other S&H IC is also dead now
should i also replace the transistors?



Oh boy - that is not good news.

I doubt that you will have to replace the transistors. At least you didn't reverse the power going into the board like I did with my CGS VCO - That was really bad.....

I guess at this point you have to try to get back to where you were, and then we can try to proceed from there...

Gary
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roman_f



Joined: Jul 03, 2007
Posts: 64
Location: Moscow
Audio files: 1

PostPosted: Wed Sep 28, 2011 4:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

well i've put 074 and 071 from my other modules and it's not working the way it was described in my first message
there are 2 transistors in S&H, i have one, the other i have in my local shop
let's try if i can let the board run
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roman_f



Joined: Jul 03, 2007
Posts: 64
Location: Moscow
Audio files: 1

PostPosted: Sun Oct 02, 2011 9:44 am    Post subject: Reply with quote  Mark this post and the followings unread

fixed everything
the problem was in bad MTA connectors
i soldered all the wires directly to the pcb and now all is good
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Mongo1



Joined: Aug 11, 2011
Posts: 411
Location: Raleigh NC

PostPosted: Sun Oct 02, 2011 9:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah! That's excellent news Roman!

Have fun playing with it now....

Gary
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