Dorcy board mod question..

[Robocop]

I know the dorcy AAA board is a simple step up circuit and I am playing around with the idea of attatching 2 5mm LEDs to this board.I am attempting to adapt a 2 AA light to use this board and will run the 2 LEDs from 2 AA cells.This will be 3 volts in and I know the circuit will boost the output but will it be enough to run two LEDs?If so would it be better to wire in series or parallel for ultimate brightness?I have adapted this board to a host using one AA cell with good results.Also is a step up circuit set to a certain level?If using this board for example and supply 1.5 volts will it be the same output as if 3 volts were supplied?
The LEDs are both from dorcy AAA boards and I am simply using one board for two identical Leds.

 

[red_robby]

wire the leds in parallel, i've done a 2AA mods with the dorcy board(LS) and it's very bright. i'm sure it will run 2 or 3 5mm leds.

 

[Doug S]

[ QUOTE ]
Robocop said:
I know the dorcy AAA board is a simple step up circuit and I am playing around with the idea of attatching 2 5mm LEDs to this board.I am attempting to adapt a 2 AA light to use this board and will run the 2 LEDs from 2 AA cells.This will be 3 volts in and I know the circuit will boost the output but will it be enough to run two LEDs?If so would it be better to wire in series or parallel for ultimate brightness?I have adapted this board to a host using one AA cell with good results.Also is a step up circuit set to a certain level?If using this board for example and supply 1.5 volts will it be the same output as if 3 volts were supplied?
The LEDs are both from dorcy AAA boards and I am simply using one board for two identical Leds.

[/ QUOTE ]
The circuit can only put out 5V max so two in series will not work. At 3V in, this circuit will severely overdrive two 5mm LEDs in parallel. Have you considered using 1AA to drive your 2 LEDs in parallel? Drive currents would be more reasonable.

 

[Robocop]

DougS I actually like the idea of one AA cell better however I thought the amps would not be high enough with only a single AA.I am still a newbie and only learning this but if one AA can do it then yes I will use this and thanks a lot for the idea.I could not remember how to wire this for best results.Series keeps amps the same and splits volts(I think)and parallel divides amps and voltage remains the same across multiple LEDs(is this correct)I am using a cheap 2 AA light from wally world as a host.It has a very nice clickie tail cap and a very good reflector.I have taken the head off and held it down on the dorcy LED and the beam quality is much better.If you cut the light down small enough for a single AA you still have room for the board.I had to dremel a little material from the inside of the cut off tail cap but with patience it will slide over the cut body.The light body is actually a little smaller than the tail in diameter so it does not take much material for a good fit.Anyway thanks again and any other suggestions would be welcomed.

 

[Doug S]

RC, even at 1AA input you should be able to exceed the 30mA max rating for 5mm leds [as if anyone seems to pay attention to this limit]. Your understanding of the series vs parallel is correct.
Happy modding.