DISA Vari-mu, add variable release/attack
« on: November 21, 2018, 09:07:55 AM »
Hi,
Can anyone point me in the right direction for adding variable release and attack for this limiter. I have a hunch C1 and R4 has something to do with it.

larger value capacitor = slower release ?
thanks
/
Emil


scott2000

Re: DISA Vari-mu, add variable release/attack
« Reply #1 on: November 21, 2018, 09:39:11 AM »
Kingston's M670 has a nice example???

https://groupdiy.com/index.php?topic=51478.0

EmRR

Re: DISA Vari-mu, add variable release/attack
« Reply #2 on: November 21, 2018, 09:43:53 AM »
C1/R4 is release.  Attack is fixed at 'fastest possible', as dictated by other circuit constraints.  Insert series resistance before C1/R4 to slow it. 

These things are highly interactive, if you do it as simple adjustable resistances, changing one affects the other.  Some units change the C and the R to keep adjustments more separate. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

Re: DISA Vari-mu, add variable release/attack
« Reply #3 on: November 21, 2018, 09:58:58 AM »
Thanks guys.
Ok so C1/R4 are release. You know what, I'll leve it as it is. don't fix it if it aint broken right.

EmRR

Re: DISA Vari-mu, add variable release/attack
« Reply #4 on: November 21, 2018, 11:48:27 AM »
I should say they are ’primarily’ release, there is still the charge time of the cap which is part of the attack.  At any rate it’s meant to be as fast as possible. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde


 

Related Topics

  Subject / Started by Replies Last post
17 Replies
4751 Views
Last post November 12, 2004, 08:04:41 AM
by StephenGiles
2 Replies
1555 Views
Last post February 07, 2005, 10:02:35 AM
by mikem
5 Replies
2126 Views
Last post July 11, 2005, 01:43:26 AM
by gyraf
15 Replies
5577 Views
Last post December 25, 2008, 07:01:14 PM
by Larrchild