I was considering that before I ended up dropping my pack voltage.
I forgot to mention the specs on the light I built, 10x 35ma LEDs so about
350ma, I'm using 2500mah AA rechargeables (Amazon basics, cheap and low self
discharge) in D cell carriers, the case was originally designed for D cells but
rechargeable D cells are expensive and the charger is expensive. The AAs should
have power enough for 5 or 6 hours before the batteries sag too bad and they
get dim. Thats more than I was getting before with the fluorescent bulbs and
10,000mah D cells. I need to do some testing but I think this light will be a
good way to use up D cells that aren't powerful enough to run the camp shower...
-Curt
From: Dan Penoff via Mercedes <mercedes@okiebenz.com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Cc: Dan Penoff <d...@penoff.com>
Sent: Monday, January 11, 2016 9:48 AM
Subject: Re: [MBZ] Using LEDs - was OT: Politics are angrier polls
I got a bag of like 25 LEDs with dropping resistors for operation on 12VDC on
Amazon for $8.00, I think.
Dan
Sent from my iPad
> On Jan 11, 2016, at 9:22 AM, Curt Raymond via Mercedes
> <mercedes@okiebenz.com> wrote:
>
> You can buy LEDs with the resistor already integrated. In fact I think with
> some you can even buy a PWM switching power supply already integrated so you
> can run them at your chosen voltage. Thats what I'd intended to do but not
> what actually happened.
> The LEDs I ruined were surface mount package which wasn't as easy to solder
> as I'd hoped. Looking around I found a bag of through hole LEDs I'd bought
> but never used. Dropping one cell from my battery pack gives me 3.6v using
> rechargeable batteries which I tested and appeared to be acceptable with my
> 35ma LEDs so I rewired the thing with those. I finished it last night and
> testing shows that it works pretty well for a reading light (its intended
> purpose) although it could stand a little work aiming the LEDs better.
> I think you missed the point of my diode, I've got a single pole single throw
> 3 position switch. On low it activates one string of lights, on high it
> activates both. The diode sits on the jumper from the high side so that it
> doesn't turn on when low is called for.
> Also in my experiments LEDs must be used in parallel which matches my
> understanding of how they work. Because they are one way valves the
> electrical pixies won't pass through like they would a normal valve.
> Certainly when I strung them up in series they wouldn't do anything...
> -Curt
>
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