[Blabber] Switching long strings of LEDs

Robert Diamond rmd6502 at gmail.com
Fri Dec 30 21:01:06 UTC 2016

You could put them in series-parallel, to reduce the voltage requirement, though then differing voltage drops could bite you
> On Dec 30, 2016, at 12:22 PM, Rob Johnson <darnrascal at gmail.com> wrote:
> Wait no Eugene confused me and I was right the first time
> On Fri, Dec 30, 2016, 3:17 PM Rob Johnson <darnrascal at gmail.com <mailto:darnrascal at gmail.com>> wrote:
> Oops! I mean 60-75v @ 1w or even 1/4w no need for an amp!
> On Fri, Dec 30, 2016, 3:05 PM Rob Johnson <darnrascal at gmail.com <mailto:darnrascal at gmail.com>> wrote:
> Looking for some advice:
> I'm helping a friend with a project, she's trying to control "strings" of LEDs, i.e. a chain of 10-25 LEDs in series. Control == switch them on and off sometimes, don't even need to do pwm. 
> Because the current requirement for a string is pretty low (30ma, or so), I'm thinking of playing around with a MAX6922 VFD tube driver, as this is serially controllable, and can output 76v*40ma per pin. 
> I'm now stuck trying to find a reasonable Boost converter that's small, and can get me 60-75v from 12v (preferably 9v or 5v). Ebay has a few things that can get me 40v <http://www.ebay.com/itm/DC-DC-3V-35V-To-4V-40V-Step-Up-Power-Supply-Module-Adjustable-Boost-Converter-/122271129659?tfrom=121419164360&tpos=right&ttype=coupon&talgo=undefined&autorefresh=true>, but I can't find anything better. A 40v source will be ok, since that can power 13-20 LEDs but if I can get more volts, I can get a better result, and it would be a shame not to. 
> Where can I get a small boost converter that will give me 60-75v @ 1amp, or even less (I can probably make 1/4amp work)? 
> Happy new year,
> -Rob J
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