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 Forum index » DIY Hardware and Software » YuSynth
Yusynth ladder not sounding
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MapacheRaper



Joined: Feb 15, 2018
Posts: 150
Location: Spain

PostPosted: Fri Sep 21, 2018 9:24 pm    Post subject: Yusynth ladder not sounding Reply with quote  Mark this post and the followings unread

Hi guys,

I have built a yusynth ladder VCF and Im getting no sound at all. It´s built from the originial soundtronics PCB.

I have checked the +V and -V at the tl072 and are correct but Im not sure what else to test. Is there any guide for troubleshooting this?.

Any table with voltages at pins or suggestions would be helpful Wink


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MapacheRaper



Joined: Feb 15, 2018
Posts: 150
Location: Spain

PostPosted: Fri Sep 21, 2018 9:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

the pcb


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MapacheRaper



Joined: Feb 15, 2018
Posts: 150
Location: Spain

PostPosted: Fri Sep 21, 2018 9:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

When I matched the transistors, I got a pair with a very strange reading, Im guessing maybe I fried them.

Maybe.

Is there any way to check if the the trannies are working while they are soldered or I have to desolder them?
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murmeklis



Joined: Oct 26, 2018
Posts: 4
Location: Lithuania

PostPosted: Fri Oct 26, 2018 9:53 am    Post subject: Reply with quote  Mark this post and the followings unread

I have recently built this using soundtronics PCB as well, once I get the chance (expect a few days), I will post some voltage measurements, if you still think they are useful.
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MapacheRaper



Joined: Feb 15, 2018
Posts: 150
Location: Spain

PostPosted: Sat Oct 27, 2018 12:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey murmeklis, thank you so much for your help!!

It happens that I was mixing 2n3906 matched ones with BC547C matched ones in the ladder!. So after desolder and put the correct ones, the filter is sounding like silk

So no need for these measurements (unless you want to do it for science). What I did found, though, is that R32 or R33 needs to be higher to get a nice output level.

If you are using eurorack voltages, you should read this thread:

http://electro-music.com/forum/topic-70376.html

So, thanks again and enjoy your new little baby!
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murmeklis



Joined: Oct 26, 2018
Posts: 4
Location: Lithuania

PostPosted: Sat Oct 27, 2018 3:54 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks for your tip, I haven't even thought about the output level, seemed fine for me, but will definitely check. Glad you fixed it, enjoy!
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