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 Forum index » DIY Hardware and Software » YuSynth
Problem with ADSR v2[SOLVED]
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capicoso



Joined: Nov 19, 2012
Posts: 112
Location: Argentina

PostPosted: Tue Mar 12, 2013 11:48 pm    Post subject: Problem with ADSR v2[SOLVED]
Subject description: almost fully working but...
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...Hello!
I finished my first yusynth module, ADSR v2. I thought it was working right, watched it on my scope, the levels were right, the inverted out also good... I swapped the led and d5 so my led works ok. I added the DPDT switch for selecting between short and long times. Switch also works ok. I tested everything with the GATE push to make button... Now, i connect it to my MIDICV 628 and a problem appeared. A weird one i think... I trigger the ADSR with 628's gate which is 5V. The problem is, when i keep the key pressed, the level won't go down to the sustain level. It'll stay at max. The weird thing is, this happens with ATTACK pot at around 70% or less. If i put it to over 70% like, 7secs or more, it works ok! Tried with the short option too, and it's the same at the same position of the pot. When 70% or less, decay and sustain doesn't work... RELEASE always works.. I checked the resistors around GATE input(R6, R3, R4, R5), diodes polarity is ok, caps are ok too, also checked the resistors near attack and sustain pots... I don't know where else to look or measure? What it confuses me is that it works fine with the GATE button... but with GATE jack, and at a certain amount of ATTACK, DECAY and SUSTAIN just doesn't work...
Thanks in advance

Last edited by capicoso on Wed Mar 13, 2013 11:45 am; edited 2 times in total
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Benjamin AM



Joined: Nov 04, 2010
Posts: 57
Location: Boise

PostPosted: Wed Mar 13, 2013 7:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Does the problem still occur if you run a 1Meg resistor parallel with R6? It's a quick test that you can do with alligator clips.
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capicoso



Joined: Nov 19, 2012
Posts: 112
Location: Argentina

PostPosted: Wed Mar 13, 2013 11:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey, i think that fixed it. Tried various combinations and it works as it should. So i'll add that resistor right now.
Thank you very much!
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