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ENV - normal, invert output.
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isak



Joined: Dec 13, 2009
Posts: 725
Location: Israel
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PostPosted: Tue Jun 25, 2013 8:53 am    Post subject: ENV - normal, invert output. Reply with quote  Mark this post and the followings unread

Hi guys.

I have an ENV with 2 outputs, normal out and invert out.
My question is...
If I connect both outputs to a pot, meaning.. the normal to left leg, the invert to right leg, do I get center position off?
my goal is to have a pot when in center position the ENV is off, when turning to left position invert ENV, when turning to right position normal ENV.
will this be the results?

Thanks in advance,
Isak E.

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piedwagtail



Joined: Apr 15, 2006
Posts: 161
Location: shoreditch
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PostPosted: Tue Jun 25, 2013 10:59 am    Post subject: Reply with quote  Mark this post and the followings unread

What's the elephant in the room?

The load impedance on the wiper.

if the two outputs Norm/Inv are driven from low impedance and the wiper is fed to a high impedance load ie.opamp voltage follower(impedance converter) then it might work....empirical study is required to confirm.(See for yourself)

Topics: signal transfer and impedance


Robert
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elmegil



Joined: Mar 20, 2012
Posts: 1505
Location: Chicago
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PostPosted: Tue Jun 25, 2013 11:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Would it be worthwhile to simply put a buffer after it then?

I've seen that used in "blend" type arrangements before (e.g. wet/dry on the Blacet Time Machine).
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analog_backlash



Joined: Sep 04, 2012
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PostPosted: Wed Jun 26, 2013 3:16 am    Post subject: Reply with quote  Mark this post and the followings unread

I don't know if this will be of any use, but my ancient ETI Transcendent 2000 synth has a pot which varies from full non-inverted AD to full inverted AD (via zero). It uses a dual-gang pot (RV30 and RV31 are physically one dual-gang pot). I noticed that mine actually uses a 100K pot rather than the 10K in the schematic. The diodes are 1N4148s and the op-amp is a 741(!) which shows how old his design is. If you go here:

http://rubidium.dyndns.org/cag/

you can find the full circuit description under Synthesizers & Modules/Other ETI Stuff/Transcendent 2000 Synthesizer.

Hope that it helps.

Gary


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isak



Joined: Dec 13, 2009
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PostPosted: Fri Jun 28, 2013 12:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks cool, thanks Smile
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