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quad slew
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Author quad slew
Navs
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PostPosted: Wed Jul 07, 2010 4:34 am    Post subject: quad slew Reply with quote Add User to Ignore List

Repurposing an unused A-180 multiple as a quad passive slew:

http://navsmodularlab.blogspot.com/2010/07/diy-quad-slew.html

smile

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dude
fuck yeah!


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PostPosted: Wed Jul 07, 2010 4:36 am    Post subject: Reply with quote Add User to Ignore List

more slew!
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en.
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PostPosted: Wed Jul 07, 2010 5:27 am    Post subject: Reply with quote Add User to Ignore List

uhuh! thank you navs and fonitronik!
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Smooth Operator
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PostPosted: Wed Jul 07, 2010 6:28 am    Post subject: Reply with quote Add User to Ignore List

Great idea! thumbs up
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Monobass
thonk.co.uk


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PostPosted: Wed Jul 07, 2010 7:14 am    Post subject: Reply with quote Add User to Ignore List

brilliant.. am I right in thinking the A180 has no other components, purely ganged connectors? If so then this is a very simple DIY project without an A-180 also.
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fonik
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PostPosted: Wed Jul 07, 2010 7:57 am    Post subject: Reply with quote Add User to Ignore List

absolutely, monobass.

it is actually nothing but a fixed lopass filter. there are quite a few passive module designs you could easily build as a start. what about a switch to select from different cap values? this would give you a passive 6db lopass with selectable cutoff (has been made by moog in the past millenium wink - see below). or what about fixed hipass, attenuators, multiples, switches (selectors)... all you need is a cheap soldering iron from the hardware store, believe me, it is sufficient for a start.

anyways, navs module will be very useful for everyone who frequently uses gates for VCAs...


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www.fonitronik.de
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stk
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PostPosted: Wed Jul 07, 2010 9:26 am    Post subject: Reply with quote Add User to Ignore List

Could this be modified to use a pot for variable cutoff/slew?
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fonik
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PostPosted: Wed Jul 07, 2010 9:33 am    Post subject: Reply with quote Add User to Ignore List

no, actually not.
by replacing the resistor with a pot you would not just change the slew rate but also change the level. in other words, the slower the slew the lower the signal level. for your ears the lowering of the level would simply whitewash the effect of changing the slew.
to prevent this you would have to use opamps as buffers, thus having an active module.

as i mentioned above you could use a switch for selecting capacitors of different values (as seen on the moog schematic above). the larger the cap, the slower the slew...

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Last edited by fonik on Wed Jul 07, 2010 9:36 am; edited 1 time in total
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haesslich
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PostPosted: Wed Jul 07, 2010 9:52 am    Post subject: Reply with quote Add User to Ignore List

with a 4051 and a counter you could replace the switch by a trigger signal... okay, again this would be an active module ;-)
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stk
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PostPosted: Wed Jul 07, 2010 9:58 am    Post subject: Reply with quote Add User to Ignore List

Thanks for the info, fonik.
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itijik
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PostPosted: Wed Jul 07, 2010 11:12 am    Post subject: Reply with quote Add User to Ignore List

This is nice. I was thinking that this would be perfect to use with the A160-161 outputs! hyper

(oh, you mention the RCD on your article...YAH!)
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itijik
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PostPosted: Wed Jul 07, 2010 2:14 pm    Post subject: Reply with quote Add User to Ignore List

Are the values used for this filter the same values used on the fonik mixer, heard here?... http://navsmodularlab.blogspot.com/2010/06/patch-tips-11-ac-coupled-mi xing.html
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fonik
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PostPosted: Wed Jul 07, 2010 4:24 pm    Post subject: Reply with quote Add User to Ignore List

no. far from that. in fact it is a different configuration. the fonitronik attenuverting mixer uses a highpass configuration to remove offset.
and it uses a 22uF, that gives much longer times anyways.
nav wanted to remove the 'pop' of the VCAs caused by those steep rising edges, so he wanted to smooth them just a little bit. yo won't even recognize it on slowly changing CVs.

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matthias
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www.fonitronik.de
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Monobass
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PostPosted: Wed Jul 07, 2010 4:59 pm    Post subject: Reply with quote Add User to Ignore List

fonik wrote:
absolutely, monobass.

it is actually nothing but a fixed lopass filter. there are quite a few passive module designs you could easily build as a start. what about a switch to select from different cap values? this would give you a passive 6db lopass with selectable cutoff (has been made by moog in the past millenium wink - see below). or what about fixed hipass, attenuators, multiples, switches (selectors)... all you need is a cheap soldering iron from the hardware store, believe me, it is sufficient for a start.

anyways, navs module will be very useful for everyone who frequently uses gates for VCAs...



I like the idea of making some manual switches with adjustable slews smile
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itijik
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PostPosted: Wed Jul 07, 2010 5:30 pm    Post subject: Reply with quote Add User to Ignore List

Thanks fonik!
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dequalsrxt
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PostPosted: Wed Jul 07, 2010 5:54 pm    Post subject: Reply with quote Add User to Ignore List

that'd be nice to do to one of the sets of multiples on the 1u modular world utility strip... might have to do that. cheers! Guinness ftw!
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fonik
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PostPosted: Thu Jul 08, 2010 12:55 am    Post subject: Reply with quote Add User to Ignore List

Monobass wrote:
I like the idea of making some manual switches with adjustable slews smile

the values from the moog module are for audio, primary. you may want to try different cap values for CV.

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matthias
www.modular.fonik.de
www.fonitronik.de
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DGTom
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PostPosted: Thu Jul 08, 2010 6:50 am    Post subject: Reply with quote Add User to Ignore List

Great use for a "useless" module hihi

For "random" slew, use an LDR instead of a normal resistor (or in parallel)

Bend the LDR so it faces inside the case or towards the crack in between modules for differant amounts of "random"

@Navs; have you tried stacking multiple RCD outs into the input?
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[Djo]
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PostPosted: Fri Jul 09, 2010 10:17 am    Post subject: Reply with quote Add User to Ignore List

Thank you for this tip navs!

I made mine with a switch. I use 1µ and 4.7µ.

Edit : 4.7µ is too small, I put a 6.3µ on parallel and it's great. wink

Sound example :
Soundcloud A180 Mod Slew


Last edited by [Djo] on Sat Jul 10, 2010 4:26 am; edited 1 time in total
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en.
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PostPosted: Fri Jul 09, 2010 2:58 pm    Post subject: Reply with quote Add User to Ignore List

thumbs up
it could be nice also with a three position selector 1-off-2
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