[DML] LED discussion (was: #5939 at DCS'12)

["Tom Niemczewski" <dmctom@xxxxxxxxx>]

Welmoed,

The LED strips are ready made and you can't really add or change the 
resistors. The strips that are water resistant are covered with clear 
urethane rubber to protect the circuit. So, in order to add resistors to 
each group you would have to cut the strip at every group joint and add 
resistors there. That is not really practical and will destroy the water 
resistant coating. So, to make it easier you can just add one resistor. A 
lot easier.
If you were to make the strip yourself from scratch it would make more sense 
to run three LEDs off of a LM317 connected as a current limiter. It would 
keep the current constant from about 10 to 40 volts. You could connect more 
than one 3-LED branch in parallel to make it more efficient.
In store bought strips you have to work with what you have.


Greetings from Poland!
Tom Niemczewski
Vin 6149 plus 2418, 3633, 5030, 16473, 17086
Google earth: 52°25'17.66"N, 21° 1'58.40"E

--------------------------------------------------
From: "Welmoed" <welmoedj@xxxxxxxxx>
Sent: Wednesday, June 13, 2012 9:52 AM
To: <dmcnews@xxxxxxxxxxxxxxx>
Subject: [DML] Re: #5939 at DCS'12

> I agree, Tom.
> However if the LEDs are grouped (3 or 5) why not add the appropriate 
> resistor to each of the groups?
> In case of failure, it will be only one group that fails, not one after 
> another?
> It's not the cost of the resistors, it's the safety  and reliability that 
> counts.
>
> I presume Bitsyncmaster can elaborate on the subject much better than I 
> can.
>
> Welmoed.
>
> P.S.: Shouldn't the subject line need changing to reflect the LED 
> discussion?
>
>
> --- In dmcnews@xxxxxxxxxxxxxxx, "Tom Niemczewski" <dmctom@...> wrote:
>>
>> If your strip has 10 groups (30 LEDs) you will need a 1250 Ohm 1Watt
>> resistor. If you can't find a resistor of the exact value go with the 
>> next one up.
>> Greetings from Poland!
>
>> Tom Niemczewski
>
>
>
>
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