[Blabber] Switching long strings of LEDs

Silence Dogood matt at nycresistor.com
Fri Dec 30 21:26:51 UTC 2016


You might look at the pixel pusher

On Dec 30, 2016 10:01 PM, "Robert Diamond" <rmd6502 at gmail.com> wrote:

> 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> 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> 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.
>>
>> TL;DR
>> 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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