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Re: Sequential Switch - using pots

2007-08-14 by John Mahoney

At 03:51 PM 8/13/2007, Andrew wrote:

>I'm working on a Sequential Switch for sequencing. Each of the eight
>steps having an LED, a Gate Out jack, and a pot.
>
>If I use +15v off the PCB (right after the bead), should there be a
>resistor between that voltage and the pot? What size?
>
>I'm guessing there should be since I wired it up without one and it
>blew up the bead (a 10R resistor).
>
>Magic Smoke Drew

IMHO, you shouldn't use the 15 volt rail to be a "reference quality"
voltage source. A sequencer should have a precision voltage reference
(as should a VCO, for example). Not that I can recommend one.*
--
john (of Magic Smoke Electronics, ahem! ;-)

* You can see why Tim Servo handles our engineering.


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