[simpits-tech] Resistor for LEDs?

[Joseph Fagner]

Also, isn't there a way to wire power supplies together such that the
supply voltage stays the same but the amperage is cumulative?  Same way
for constant current and cumulative voltage.  One is parallel and the
other is series, I just can't remember which.

Jay

-----Original Message-----
From: simpits-tech-admin@simpits.org
[mailto:simpits-tech-admin@simpits.org] On Behalf Of Ben Jones
Sent: Thursday, December 26, 2002 12:38 AM
To: simpits-tech@simpits.org
Subject: Re: [simpits-tech] Resistor for LEDs?

not a problem jay,

 give me a while  and i should have a small  rough diagramme for you to
follow,

with this way of wiring up a main 12v buss any thing 12 v can be hooked
up
to it ,
just make sure your transformer can handle the full load.

ben



----- Original Message -----
From: "Joseph Fagner" <crease-guard@attbi.com>
To: <simpits-tech@simpits.org>
Sent: Thursday, December 26, 2002 12:26 PM
Subject: RE: [simpits-tech] Resistor for LEDs?


> Hey Ben, I am planning on using some different power supplies I found
on
> eBay that provide both 5 and 12 volts and were used for disk drive
> enclosures.  Could you diagram what your saying as it's hard to
> visualize, but a picture goes a long way.  I would like to uses this
way
> to power my back lighting as well.
>
> Thanks
> Jay
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
> [mailto:simpits-tech-admin@simpits.org] On Behalf Of Ben Jones
> Sent: Wednesday, December 25, 2002 8:29 AM
> To: simpits-tech@simpits.org
> Subject: Re: [simpits-tech] Resistor for LEDs?
>
> Guys,
>
> Can i suggest from a electrical background , not using your computer
> power
> supply to power led's and there associated resistors,
> for the simple factor that if you have a "misfortune" with a led or
> associated wiring having a blow out or melt down , this could cause
the
> power supply to your pc to either fail or cause dammage to the boards
if
> a
> spike was created.
>
> the power supplys being load dependant will constantly vary the
amperage
> tho
> maintain a constant voltage, if there was any big load changes on the
> supply
> there is a chance that your led's will vary in light intensity being
> given
> off..
>
> My suggestion to solve this problem ( or anticipated problem) is to
have
> a
> separate filtered and proctected powersupply being of 12 v dc ,
> supplying
> your leds by a 12 v bus ( a parallel circuit)  , this is easy to tap
off
> the
> 12 v needed take the active through your switched contact to turn the
> led
> off and on , then through the  power dissapation resistor  onto the
led
> and
> out to  the 12v bus neutral,  because this is all in parallel  only
the
> 1
> wattage resistor is needed for each led , and because the supply is
> constant
> where ever you tapp off ( given the powersupply can handle the full
load
> plus 10%) there should be no drop in intensity throught each led , as
> would
> the cas be in a series circuit.
>
> The only reason i suggest this is because the power supply is feeding
> some
> pretty expensive gear and it works best just powering the computer,
> which is
> the way it was designed for.
>
> If there is any electronic techo's out there please correct me if i'm
> wrong..
>
> regards
>
> ben
>
> ****************************
> bjones@pipecomp.com.au
> *****************************************
>
>
> ----- Original Message -----
> From: "Joseph Fagner" <crease-guard@attbi.com>
>
> > That's simple, don't really need to know the load, just use an free
> > molex connector from one of the systems running your simulator.
Your
> > computer will provide the load.
>
>
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