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 Forum index » DIY Hardware and Software » YuSynth
ADSR new version
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ludo



Joined: Sep 20, 2018
Posts: 4
Location: Berlin

PostPosted: Thu Sep 20, 2018 1:19 pm    Post subject: ADSR new version Reply with quote  Mark this post and the followings unread

I built the new version of yusynth´s ADSR, it works but there is no affect in the decay and sustain pots. What could be wrong?

Thanks a lot - Lu
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Grumble



Joined: Nov 23, 2015
Posts: 1033
Location: Netherlands
Audio files: 28

PostPosted: Thu Sep 20, 2018 10:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

you wil notice that the forum will be much more responsive if you:
1 provide some more info like a link to your project, or a schematic...
2 write down what is working and what is not
3 write down what you have done so far to eliminate your problem
4 post pictures, soundbytes or anything to make it easyer to help you out.
these are just some hints you could follow to get the best of the forum for now (for me) it is impossible to give you a satisfying answer without asking you questions and that is the other way around...

having said that: welcome to the forum

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my synth
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gabbagabi



Joined: Nov 29, 2008
Posts: 559
Location: Berlin by n8
Audio files: 23

PostPosted: Fri Sep 21, 2018 3:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Berlin in da Houze! party!

As Senhor Grumble already wrote down the essentials of "good asking", i will only say: hello and welcome to the forum!

If you feel like write in german, feel free to pm me.

cu,bb
gabbagabi
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ludo



Joined: Sep 20, 2018
Posts: 4
Location: Berlin

PostPosted: Fri Sep 21, 2018 8:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi to all! Smile

Tha adsr is working like a a/r generator. The attack and release pots are working well, but the decay and sustain pots are simply do nothing. I checked the schematic few times, but cant find any mistakes.[/img]
The photo was taken when all pots at ca 30%


2018-09-21 17.10.49.jpg
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2018-09-21 17.10.49.jpg


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ludo



Joined: Sep 20, 2018
Posts: 4
Location: Berlin

PostPosted: Fri Sep 21, 2018 8:29 am    Post subject: Reply with quote  Mark this post and the followings unread

http://www.yusynth.net/Modular/Commun/ADSR/ADSR555-FINAL.gif
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gabbagabi



Joined: Nov 29, 2008
Posts: 559
Location: Berlin by n8
Audio files: 23

PostPosted: Fri Sep 21, 2018 8:58 am    Post subject: Reply with quote  Mark this post and the followings unread

first impulse-guessing: check if D4 is soldered in, in the rigth direction

then i would see how pin12/U2d is behaving, while attacking there should be 15V present, after attack (output reaching 10V) it should change to the sustain voltage, while release it should go back to 15V.
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ludo



Joined: Sep 20, 2018
Posts: 4
Location: Berlin

PostPosted: Wed Nov 07, 2018 11:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Problem solved! Smile

There was a failure in the pcb, Pin 1 Of the 7555 Chip was not connected to ground, but instead Pin 2 was connected to ground!

Now i'm happy to have a nice ADSR Very Happy

Thanks for help! Smile
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gabbagabi



Joined: Nov 29, 2008
Posts: 559
Location: Berlin by n8
Audio files: 23

PostPosted: Wed Nov 07, 2018 11:40 am    Post subject: Reply with quote  Mark this post and the followings unread

cheers
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