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 Forum index » DIY Hardware and Software » YuSynth
Wavefolder dead. ANy hint?
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gibrancurtiss



Joined: Mar 16, 2016
Posts: 17
Location: brazil

PostPosted: Sun May 07, 2017 4:08 pm    Post subject: Wavefolder dead. ANy hint? Reply with quote  Mark this post and the followings unread

Hi Guys.

Finished the Yusynth Wavefolder.
After calibrating the trimmers I checked the entire circuit and here what i got:
-everything is perfect until the wave reaches pin9 U1c.
-pin 10 is grounded.
-but , a 13V rises from pin8 U1c

After this point no more wave.
Already replaced U1 by another TL or LM but still the same.

Any hint why U1c did not invert the signal ?
All red area is "dead". There is voltage but the wave didnt reach it.


Thank you and have a nice week!

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micromusic



Joined: May 05, 2014
Posts: 45
Location: england

PostPosted: Wed May 10, 2017 11:32 am    Post subject: Reply with quote  Mark this post and the followings unread

With all my Yusynth projects when they don't work it's normally a short or a badly etched board or a dry joint or the wrong value component so quite a few things to
check
Make sure all the above are ok as these circuits do work if you use all the listed components
I assume you have checked for power on all the chips etc as that's another thing to test
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micromusic



Joined: May 05, 2014
Posts: 45
Location: england

PostPosted: Sun May 14, 2017 2:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Check you have diodes 1 and 2 in the right way as I am stuffing this board right now and had to check the schematic for the correct orientation
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micromusic



Joined: May 05, 2014
Posts: 45
Location: england

PostPosted: Wed May 17, 2017 2:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just finished mine tonight
Worked first time and needed no trimming/setup (lucky I guess)
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gibrancurtiss



Joined: Mar 16, 2016
Posts: 17
Location: brazil

PostPosted: Wed May 17, 2017 6:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Micromusic

I've found the error.
One thing that i 've never see before.
The R2 100k had only 120ohms.
Even with right colors code.

Just replaced the resistor Smile

Thanks
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micromusic



Joined: May 05, 2014
Posts: 45
Location: england

PostPosted: Thu May 18, 2017 1:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's a frustrating thing to find🤒 I had a similar issue with a strip of 50 100K resistors that turned out to be 1K
I have posted a YouTube video of mine just Google Yusynth wavefolder mines the one with the white panel one side is the Metalizer the other half the wavefolder
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gibrancurtiss



Joined: Mar 16, 2016
Posts: 17
Location: brazil

PostPosted: Fri May 19, 2017 7:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great module.

Worth to build it
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yusynth



Joined: Nov 24, 2005
Posts: 1298
Location: France

PostPosted: Mon May 22, 2017 5:08 am    Post subject: Reply with quote  Mark this post and the followings unread

Don't forget Jurguen Haible for the original design. My contribution was to add a VCA to drive the input signal and design a proper PCB.
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Yves
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bonzai



Joined: Apr 02, 2017
Posts: 4
Location: Germany

PostPosted: Mon May 22, 2017 3:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

d'oh!
Thanks guys for the resistors hint, that just didn't come to mind. I was having the same problem: the 15k and 10k were 15 and 10 ohms (grabbed the wrong bag apparently - still not used to these blue MF resistors...) Embarassed Swapped 'em out, works. Very Happy

by the way, for a noob: how important is the transistor- and diode matching and what would be the effect if they were not matched?
I just got a whole bunch of diodes from the same batch (on a belt), not sure about the transistors though (but they all came in the same bag), and matching these doesn't sound like the fun part at all. Wink

Cheers,
bonzai
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yusynth



Joined: Nov 24, 2005
Posts: 1298
Location: France

PostPosted: Tue May 23, 2017 12:25 am    Post subject: Reply with quote  Mark this post and the followings unread

The matching here is only meaningful if you want to obtain a perfectly symmetrical signal on the output. I you don't care about symetry then don't bother matching components.
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bonzai



Joined: Apr 02, 2017
Posts: 4
Location: Germany

PostPosted: Tue May 23, 2017 12:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ah, okay! It already looked quite symmetrical to me on the scope, so I guess there is no real need for matching (at least for me).

Thanks! Smile
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