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 Forum index » DIY Hardware and Software » YuSynth
ARP FILTER trimming
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roman_f



Joined: Jul 03, 2007
Posts: 63
Location: Moscow
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PostPosted: Thu Oct 06, 2011 1:33 pm    Post subject: ARP FILTER trimming
Subject description: 0V?
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could you please tell me how can i apply 0V to trim T1
where can i get that 0V?
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Ali M



Joined: Sep 01, 2009
Posts: 96
Location: uk

PostPosted: Thu Oct 06, 2011 2:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

you have to measure from the base of the transistor and adjust T1 so the voltage reads 0v.
you don't apply 0v to T1.
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yusynth



Joined: Nov 24, 2005
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PostPosted: Fri Oct 07, 2011 12:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Very simple, you can do that by shortening the input to ground.
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Yves
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roman_f



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PostPosted: Fri Oct 07, 2011 6:57 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you yves :) now i need to find a 1V source
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yusynth



Joined: Nov 24, 2005
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PostPosted: Fri Oct 07, 2011 7:16 am    Post subject: Reply with quote  Mark this post and the followings unread

roman_f wrote:
thank you yves Smile now i need to find a 1V source


If you have a CV/GATE keyboard or a MIDI keyboard and a MIDI2CV converter you can simply use then to generate the various steeped voltages 0V, 1V, 2V and so on by pressing the C keys at different octaves.

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Yves
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roman_f



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PostPosted: Fri Oct 07, 2011 8:22 am    Post subject: Reply with quote  Mark this post and the followings unread

perfect, thank you :) the last question - is the basis located on down right leg?


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yusynth



Joined: Nov 24, 2005
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PostPosted: Fri Oct 07, 2011 8:31 am    Post subject: Reply with quote  Mark this post and the followings unread

No the bases of the dual transistors are leftmost and rightmost pins. For trimming you must do the testing on the right most : the pin that is in connection the CV input resitors.
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Yves
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roman_f



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PostPosted: Fri Oct 07, 2011 8:45 am    Post subject: Reply with quote  Mark this post and the followings unread

so the input where i apply 0V and 1V is a 1V/Oct input? not the audio one?
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yusynth



Joined: Nov 24, 2005
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PostPosted: Fri Oct 07, 2011 9:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes and that's exactly what is written in the trimming instructions :
Quote:
Turn the frequency knob to 0, turn all the control knobs to 0 (fully counter clockwise)
Apply 0V to the V/Oct input
Measure the voltage at the basis of Q6 (2SA798) (node between R46, R30 to R34), adjust T1 in order to obtain 0V at this very node.
Apply 1V to the V/Oct input
Adjust T2 in order to measure 18.7mV at the previous node.
Apply 0V to the V/Oct input
Adjust T1 in order to measure -187mV at this very node.

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