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 Forum index » DIY Hardware and Software » YuSynth
Help with Dual Balanced (ring) Modulator / Soundtronics kit
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bassculture



Joined: Jan 23, 2011
Posts: 21
Location: france

PostPosted: Fri Jun 30, 2017 1:27 am    Post subject: Help with Dual Balanced (ring) Modulator / Soundtronics kit Reply with quote  Mark this post and the followings unread

Hello all !

i am building some yusynth modules.

Boards are good quality & shipping was fast Wink

A have trouble with the ring mod >

Both sides are showing similar behaviour
althought measurements on 2nd amp of TL072 1 & 2 are not the same.

behaviour is : no (ring mod at) output, only very low level input 1 + 2
(bleedthrought i suppose - approx 20x less level than input )

I'm using a +/- 15V Power Supply



here are my voltages :

TL072 n1:
0
7,29
7,27
-14,87
0
0
-0.05
+15.15

MC1496 n1 :

-4,16
-0,59
-0,62
-4,19
-14,34
14,56
0

15
0
15
0
14,56
0
-14,86



TL072 n2 :
0
6,22
6,21
-14,86
0
0
-0.24
+15,16

MC1496 n 2 :
-4,19
-4,90
-4,9
-4,24
-13,17
+12,41
0

13,04
0
13,05
0
12,45
0
-14,87

Last edited by bassculture on Fri Jun 30, 2017 8:07 am; edited 1 time in total
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bassculture



Joined: Jan 23, 2011
Posts: 21
Location: france

PostPosted: Fri Jun 30, 2017 1:55 am    Post subject: Reply with quote  Mark this post and the followings unread

pictures below >>


Yusynth ring mod board.JPG
 Description:
 Filesize:  1.97 MB
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This image has been reduced to fit the page. Click on it to enlarge.

Yusynth ring mod board.JPG


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bassculture



Joined: Jan 23, 2011
Posts: 21
Location: france

PostPosted: Fri Jun 30, 2017 2:56 am    Post subject: Reply with quote  Mark this post and the followings unread

/// and posting this as a reminder...

If Yves Usson is around >

what does he meant by "this module can be used as voltage controlled distortion or clipping module"
modulating Audio w/ Fixed CV is the way ?
then it'll clip in the TL072 first stage ?
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yusynth



Joined: Nov 24, 2005
Posts: 1294
Location: France

PostPosted: Wed Jul 05, 2017 10:05 am    Post subject: Reply with quote  Mark this post and the followings unread

It seems that the ground pad of the input connector misses a track to actually connect it to the ground, thus the 1.5K (R8 and R30) is not connected to the ground although it should be. Connect a wire between the ground pad pf this connector to the closest ground track.

There is also a missing track between R16 and the ground track.

Sorry about that I will have this corrected and will publish an erratum on Soundtronics

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bassculture



Joined: Jan 23, 2011
Posts: 21
Location: france

PostPosted: Sat Jul 08, 2017 6:38 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you very much for your quick reply !

someone has to crash-test those new PCB's ! this is DIY after all Wink

I'll try this and post pictures as soon as i can get back to the soldering desk !
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bassculture



Joined: Jan 23, 2011
Posts: 21
Location: france

PostPosted: Sat Jul 08, 2017 2:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Corrections done.

Here is a picture of them >


IMG_2352-Yusynth-dual-balanced-modulator-corrections.jpg
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IMG_2352-Yusynth-dual-balanced-modulator-corrections.jpg


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Blue Hell
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Joined: Apr 03, 2004
Posts: 22201
Location: The Netherlands, Enschede
Audio files: 208
G2 patch files: 319

PostPosted: Sat Jul 08, 2017 4:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice solder work too :-)
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bassculture



Joined: Jan 23, 2011
Posts: 21
Location: france

PostPosted: Mon Jul 10, 2017 2:12 am    Post subject: Reply with quote  Mark this post and the followings unread

@bluehell

thanks !
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