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Old 11-26-2008, 10:56 PM #1
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Default possible 3$ boost circuit

I was messing around with the 1aaa rayovac penlight.
The exact same one found http://www.flashlightz.com/product.php?product=171701. Except I got mine from Wal-Mart for $3.88

The first one i bought i measured 78 mA. I removed the resistor and measured over 200mA.. I couldnt tell you how much because my multimeter only goes up to 200mA.
I accidentally broke it (lol), so I got another one and a new multimeter. Here are the results after removing the resistor.


Soldering where the resistor used to be.

I hooked up test leads

set multimeter to 10A, reading 400mA?

This would be an awesome laser 400mA with open can diode using only 1aaa!
I was thinking about making it into a laser, do you guys think its safe?




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Old 11-26-2008, 11:13 PM #2
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Default Re: possible 3$ boost circuit

how many volts
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Old 11-26-2008, 11:15 PM #3
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Default Re: possible 3$ boost circuit

Probably isn't a boost circuit. There should either be an inductor or a few capacitors(charge pump) and an boost converter chip.
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Old 11-26-2008, 11:17 PM #4
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Default Re: possible 3$ boost circuit

yea what jamilm9 said it has to be above the required volt rating of the ld you are using
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Old 11-26-2008, 11:19 PM #5
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Default Re: possible 3$ boost circuit

The output is probably very noisy, full of spikes and such. Maybe not ever regulated, so I'd say no. But maybe there's some room for improvements.

Quote:
Originally Posted by digital_blue
Probably isn't a boost circuit. There should either be an inductor or a few capacitors(charge pump) and an boost converter chip.
LEDs need more than 1.5V to work so it must be a boost driver.
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Old 11-26-2008, 11:19 PM #6
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Default Re: possible 3$ boost circuit

Voltage is the question here. A single AAA can easily put out 400mA, and probably a lot more, the problem is that it is only at 1.5VDC (although I dont think a LED will work at 1.5V... maybe?). Now if it can boost to 3-5VDC and still do 400mA, that will be impressive!
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Old 11-26-2008, 11:35 PM #7
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Default Re: possible 3$ boost circuit

checking....
3.73v
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Old 11-26-2008, 11:46 PM #8
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Default Re: possible 3$ boost circuit

Whoa, this might actually be a boost circuit. Could you get a picture of the other side?
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Old 11-26-2008, 11:48 PM #9
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Default Re: possible 3$ boost circuit

sure one second
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Old 11-26-2008, 11:56 PM #10
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Default Re: possible 3$ boost circuit

Both sides
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Old 11-27-2008, 12:50 AM #11
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Default Re: possible 3$ boost circuit

It looks regulated, and I believe a diode could run from 1.5V @400ma. Doesn't look like a boost circuit though.
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Old 11-27-2008, 12:51 AM #12
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Default Re: possible 3$ boost circuit

It's entirely possible it is a boost circuit capable of delivering that much as long as the batteries supply plenty of input current.

One question is: is it regulated? What is the current at 1.0, 1.2 or 1.5 volts? And what is the current driving different voltages (try 1n400x diodes in series as dummies).
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Old 11-27-2008, 01:34 AM #13
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Default Re: possible 3$ boost circuit

check ac too because led can take a lot of reverse voltage
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Old 11-27-2008, 02:14 AM #14
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Default Re: possible 3$ boost circuit

I believe I've seen ~3.5V boost chips that looked like the chip on the back, but I've yet to see a 5V boost chip in that form factor. *If someone does see one, please let me know.

Edit: There are ways to achieve more than 3.5 V out of a chip like that, but the output would not have good regulation.
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Old 11-27-2008, 02:32 AM #15
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Default Re: possible 3$ boost circuit

Testing... Ill post results when done





* * *BATTERY * * * * * * * * * * * * * * * * * *VOLTAGE AFTER CIRCUIT * * * * * * * * *CURRENT AFTER CIRCUIT
Duracell at 1.60v * * * * * * * * * * * * *-> in between 3.76v and 3.77v, briefly at 420mA and then receded to 400mA within a few seconds.
* * * * * *** * * * * * * *



















BATTERY VOLTAGE * * * * * * *VOLTAGE AFTER CIRCUIT * *CURRENT AFTER CIRCUIT
Duracell rechargeable 1.45v * * *-> * *3.71v, * * * * * * * * * * * * * * * *340mA
*
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Old 11-27-2008, 10:58 AM #16
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Default Re: possible 3$ boost circuit

you said you removed a resistor. maybe it is a voltage regulated boost circuit and the resistor was for current limiting.
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