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 9720 increase Attack time of AD envelope 
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Joined: Sat Jul 30, 2011 5:46 am
Posts: 66
Post 9720 increase Attack time of AD envelope
Is it possible to increase the Attack time of the AD envelope on this module? Can I swap out the Attack potentiometer for one with a higher resistance value, or perhaps there is a resistor somewhere on board that I can change out to a larger resistance value?

Same question as above for the Decay time.

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James


Thu Feb 06, 2020 8:22 am
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Joined: Thu Sep 24, 2009 2:14 pm
Posts: 93
Post Re: 9720 increase Attack time of AD envelope
hello james,
assuming R200 is the "attack" pot u are refferring to (5M)
"attack" happens when Q4 is enabled:
then current flows thru diode D4, then thru R200, then R207 to charge C22.
Increasing R207 will increase "attack" time.
R200 is already very large (5M) so, try a resistor 10x larger at R207 (7500ohm)

To increase "attack" AND "decay", double the value of C22.

Hope this helps..
afn
T
I


Sun Feb 09, 2020 1:29 pm
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Joined: Sat Jul 30, 2011 5:46 am
Posts: 66
Post Re: 9720 increase Attack time of AD envelope
awesome! Yes, R200 is what I was thinking of changing. Thanks so much toneman. I'll increase the size of C22 to get nice long AD envelopes. Just to be sure, R95 won't need adjusting? due to larger size C22.

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James


Mon Feb 10, 2020 9:09 am
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Joined: Thu Sep 24, 2009 2:14 pm
Posts: 93
Post Re: 9720 increase Attack time of AD envelope
don't see a "R95"(?)

the resistors in series with attack and decay don't need to be changed if u increase C22.
For increasing both attack and decay, just increase C22.

just add another 1mfd in parallel with C22.

Maybe add a switch to switch-in one or more parallel caps.

Keep that Paia Phlying!!

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Mon Feb 10, 2020 10:31 am
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Joined: Sat Jul 30, 2011 5:46 am
Posts: 66
Post Re: 9720 increase Attack time of AD envelope
awesome! will add capacitor and let you know how it goes. Thanks so much for the help. Super appreciated.

Paia Love :D

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James


Mon Feb 10, 2020 1:43 pm
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