MOTM

If I understand this correctly, the vactrol is a variable resistor who's
value is set by the brightness of an internal led. Wouldn't this be a
somewhat easy solution to those of us looking to add cv control over an
existing pot? Of course, I don't even know if these pieces are still in
production, readily available, or what the specs are. (value, tollerance,
current) -Nate


>I would replace it. It's off-the shelf, nothing special.
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>The vactrol is a combination LED and photocell. It's a variable resistor!
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>Paul S.
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>----- Original Message -----
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>From: Nathan Hunsicker <nate@...>
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>To: <motm@egroups.com>
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>Sent: Friday, April 28, 2000 7:52 AM
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>Subject: Re: [motm] 410 HELP!!!
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>> Also, could I have done any damage to the op amp by running it backwards?
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>> (it was only for 2 or so minutes) If I damaged it, is it any different
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>> thana standard off-the-shelf TL074? And just a curiosity question, what
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>> the vactrol units actally designed to do? some sort of LED driver? -Nate
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>> >You're absolutely right!!! Why do they have to confuse me by putting a
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>dot
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>> >and a notch on the case? I must have checked it 10 times before noticing.
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>> >-Nate
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>> >>IT'S IN BACKWARDS!!!!
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>> >>Paul S.
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>> >>----- Original Message -----
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>> >>From: Nathan Alan Hunsicker <nate@...>
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>> >>To: MOTM Newsgroup <motm@egroups.com>
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>> >>Sent: Thursday, April 27, 2000 10:57 PM
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>> >>Subject: [motm] 410 HELP!!!
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>> >>> I just finished the 410 tonight, the filters work fine as do the depth
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>> >>> sweep controls however, I cannot get the internal LFOs to work. My
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>rate
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>> >>> knob does nothing and upon further investigation I found that the
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>TL074
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>> >>> op amp is getting VERY hot. Any ideas? I double checked all my
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>> >>> connections and solder joints, everything is in the right place and
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>> >>> facing the right way. I cannot figure it out, any help would be
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>> >>> appreciated. Thanks -Nate
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>>>> ------------------------------------------------------------------------
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>> >>> Was the salesman clueless? Productopia has the answers.
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>>>><<<http://click.egroups.com/1/3019/3/_/529958/_/956894148/>http://click.egro
>>>>ups.com/1/3019/3/_/529958/_/956894148/><http://click.eg>http://click.eg
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>roup
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>>>>s.com/1/3019/3/_/529958/_/956894148/><<http://click.egroups.co>http://click.
>>>>egroups.co><http://clic>http://clic
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>k.egrou
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>> >>>ps.co
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>> >>>m/1/3019/3/_/529958/_/956894148/
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>> ------------------------------------------------------------------------
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>> music fans of Rock, Soul, HipHop, Jazz, Country & Dance.
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>>
>><http://click.egroups.com/1/3760/3/_/529958/_/956926630/>http://click.egroups.co
>>m/1/3760/3/_/529958/_/956926630/
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>> ------------------------------------------------------------------------
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