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 Forum index » DIY Hardware and Software » YuSynth
Modifying COMPARATOR module
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
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PostPosted: Tue Sep 23, 2008 3:50 am    Post subject: Modifying COMPARATOR module
Subject description: GATE OFF output
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Hi,

do you know if it would be easy to mod yves' module to get, not a TRIG OFF (when input changes to low), but a GATE OFF output instead, which would stay high as long as signal at the input stays under threshold.

What happen if you replace C4/C6 with a wire ?

http://yusynth.net/Modular/index.html
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yusynth



Joined: Nov 24, 2005
Posts: 1214
Location: France

PostPosted: Sat Sep 27, 2008 1:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi if you need a GATE OFF, you can pick the signal at pin 1 of U1a and add a diode and a 1K resistor in series.
If you don't need the TRIG OFF output you may replace C4 by a 10k resistor (this resistor is needed otherwise the LED would'nt operate normally I think.

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funkyfarm



Joined: Jan 21, 2007
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PostPosted: Tue Sep 30, 2008 1:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you so much.

I'll try both !
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funkyfarm



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PostPosted: Sun Mar 08, 2009 3:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

R17 R18 voltage divider and so gives 6 volts from 14V.

if i want 10V signals, what is the better choice ?

10V is about 75%...


330ohm and 1k
510ohm and 1k5 (i have this in stock...)

Would it change output impedance ? it can leads to problem ...
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yusynth



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PostPosted: Sun Mar 08, 2009 4:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

330 and 1K seems to be alright, no problem with output impedance.
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funkyfarm



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PostPosted: Mon Mar 09, 2009 2:49 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you for answer.
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