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 Forum index » DIY Hardware and Software » The Repair Shop
Sample & Hold not working
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saint gillis



Joined: Apr 21, 2012
Posts: 53
Location: Brussels

PostPosted: Mon Dec 16, 2013 1:36 am    Post subject: Sample & Hold not working Reply with quote  Mark this post and the followings unread

Hi I ve got a S&H module in this old modular synth (http://electro-music.com/forum/topic-59771.html) that's not working properly,
The synth has been restored by SynthRestore, and an additional oscillator has been added, the red part :

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

There was already an oscillator, the 2 PNPs at the top left, and the inputs marked "??" looks like negative voltage applied to vary the speed... I tried to remove the red part, to bias properly the oscillator (the 2 PNPs) and I found some kind of negative triggers at several places in the schematic, marked in blue.
It still doesn't work properly, and my lack knowledge in matter of transistors etc preserve my from getting ideas to make this module work as it should..
Any help would be appreciated, thank you forum!
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