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 Forum index » DIY Hardware and Software » YuSynth
Mixout-VC Panner problem
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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Fri Aug 17, 2012 3:06 pm    Post subject: Mixout-VC Panner problem Reply with quote  Mark this post and the followings unread

I finished soldering the Mixout-Vc Panner module ....

my problems are

1) I'm relatively noob to electronics, so I have the equipment (pure luck) like Votlmeter, Oscilloscope and functiongenerator but regarding circuits I still have to learn a lot

2) channel 2 is nearly deaf ... the input is less by a factor of 100 ... so I see a triangle when testing, which changes if I turn the pan-pod but it's extremely minimal

3) the right channel of the VC-Panner Submodule is completely deaf ...
I send in a triangle, turned the pan - played with the trimmer but on all channels ... nothing
left side works well (except channel 2)

could someone please give me some debugging tipps??
- what should I measure and where??

thanks a lot in advance,

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greetings from belgium, Sascha

My new blogspot: http://ungleichklang.blogspot.com
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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Sat Aug 18, 2012 3:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

I co-checked today and can say:

for channel 2: it's not the IC's, I switched all of them today with channel 1 and nothing changes ...

for the right-out:
the TL072 gets +-15V,
I changed him with another TL072 and the right-out stays silent ...
I measured on Pin 1 and no signal is there ....
(yes, I set the pan to the middle)
from all channel-outs I get contact to Pin 2 and R5 ...
R5 is 47k as R6 so I assume its not broken (etching faults)
R5 and the Pins of the TL072 are connected as whel, so I assume no etching faults there too

what should be measured on pin 2 of the TL072?? voltsmeter or osciloscope??

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My new blogspot: http://ungleichklang.blogspot.com
My Youtube-Channel: http://www.youtube.com/user/ungleichklang


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iopop3



Joined: May 28, 2010
Posts: 95
Location: Malmö, Sweden

PostPosted: Sun Aug 19, 2012 4:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Some general hints. The board uses both 100R and 100k resistors, make sure you accidentally didn't have any of those mixed up. Having a 100R instead of a 100k at the feedback path of the op-amp would lead into a lot less gain.

Which tl072 are you talking about? U2 on the "Output & Monitor sub module" ?
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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Sun Aug 19, 2012 5:08 am    Post subject: Reply with quote  Mark this post and the followings unread

iopop3 wrote:
Some general hints. The board uses both 100R and 100k resistors, make sure you accidentally didn't have any of those mixed up. Having a 100R instead of a 100k at the feedback path of the op-amp would lead into a lot less gain.

Which tl072 are you talking about? U2 on the "Output & Monitor sub module" ?


I will check the resistors this eve.
I meant the U5 on the MixerSubmodule

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greetings from belgium, Sascha

My new blogspot: http://ungleichklang.blogspot.com
My Youtube-Channel: http://www.youtube.com/user/ungleichklang


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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Sun Aug 19, 2012 5:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Another update:
I found and followed the singalpath on all channels (for me as noob to electronics this is way good)

f.e. on channel 1:
The TL072 (U102) gets the triangle signal and passes it on pin 1 and 7 to right and left
=> signal comes in on Pin 4 and 13 of LM13700 (U103) and I see the triangle
=> pins 5/7 signal is there (right channel)
=> pins 10/12 no signal (left channel)

hmmm debugging goes on

Update=> I found a solderingbridge on channel 2 =W this one works now like all others

left stays dead R122 shows 0mA all the time, no matter of pan setting
right => R123 panns between 0 and 0.45

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greetings from belgium, Sascha

My new blogspot: http://ungleichklang.blogspot.com
My Youtube-Channel: http://www.youtube.com/user/ungleichklang


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ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Sun Aug 19, 2012 9:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Problem solved, I had some 150R instead of 150kR in the Panpaths ...

testing Monitor Submodule later ..

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My new blogspot: http://ungleichklang.blogspot.com
My Youtube-Channel: http://www.youtube.com/user/ungleichklang


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iopop3



Joined: May 28, 2010
Posts: 95
Location: Malmö, Sweden

PostPosted: Sun Aug 19, 2012 11:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Great to hear, was about to post that something have to be wrong in the area around U101a/U101b but seems like you have it sorted.

Will begin my build on this one any day now.
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