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Old 01-03-2010, 04:22 PM #17
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Default Re: Boost drivers for $2.00 -Yes it's true! (EDIT)

Does the inductance become more hot ? ..... i have similar circuits in little flashlights that uses a single AAA battery, and when dismantled one of them that stopped to work, i seen they used a low current inductance that was melted .....


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Old 01-03-2010, 04:29 PM #18
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Default Re: Boost drivers for $2.00 -Yes it's true! (EDIT)

Since this driver makes pulses, you might only measure the average current, or just maybe a get a completely false reading. I suggest you connect a 47uf cap across the LD and a Schottky diode in series with the LD and cap. This driver's input current is higher than the output when boosting, so you have to measure the current at the LD.
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Old 01-03-2010, 06:51 PM #19
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Default Re: Boost drivers for $2.00 -Yes it's true! (EDIT)

Quote:
Does the inductance become more hot ? ..... i have similar circuits in little flashlights that uses a single AAA battery, and when dismantled one of them that stopped to work, i seen they used a low current inductance that was melted ..
So far I have never felt it "hot" warm maybe.
I'm going to dig out my themocouple thermometer and attach it to the inductor and graph it's temp. at various output ranges. I have plenty of these drivers now, so I going to try to "kill" one to see the max. V in and max mA forward and the temps. produced.

Quote:
Since this driver makes pulses, you might only measure the average current, or just maybe a get a completely false reading. I suggest you connect a 47uf cap across the LD and a Schottky diode in series with the LD and cap. This driver's input current is higher than the output when boosting, so you have to measure the current at the LD.
Thanks for this tip, I was going to use the 47uF cap. I'll have to check and see if I have any Schottky diodes on hand. (probably not)
Like I said in the last post, over 1 hour run time and the LD is still producing the same power it was hooked up to a Flexdrive.
LD and driver life is going to be the key factors, I believe. Also all testing has been done with the same PHR, so with a different one, who knows?
Just ordered a bunch of LD's off of Glenn, so in 4 to 6 days ,I should know more.
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Old 01-03-2010, 07:30 PM #20
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Default Re: Boost drivers for $2.00 -Yes it's true! (EDIT)

Quote:
Originally Posted by Greenmechanic View Post
I'll have to check and see if I have any Schottky diodes on hand. (probably not)
Why would you need Schottky diodes? You already have one on the driver .
And, LOL, the pictures really give false impression of the size of this driver. Last picture made me realise how small is this thing .
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Old 01-03-2010, 07:43 PM #21
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Default Re: Boost drivers for $2.00 -Yes it's true! (EDIT)

Because he needs another one... It's like saying "why do you need that spare tire, you already have 4 on the car".
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Old 01-04-2010, 09:54 PM #22
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Default Re: Boost drivers for $2.00 -Yes it's true! (EDIT)

Thanx Green I didn't recall seeing the ones you posted, I drove over there today and as I figured they didn't have them. It looks like an easy circuit to build tho Just need a components list, then I can do a PCB layout etch up a few boards and build it. if anyone can give some components info that would be great.


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Old 01-05-2010, 08:00 PM #23
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Default Re: Boost drivers for $2.00 -Yes it's true! (EDIT)

awesome! I always thought drivers were overpriced..... Although the flexdrive does make up for it with great performance. I think these things have more potential driving <50mW micro builds (eg for EDC or xmas presents) than higher powered diodes...

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Old 01-05-2010, 11:53 PM #24
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Default Re: Boost drivers for $2.00 -Yes it's true! (EDIT)

Ok I started a PCB lay out and have my components on the way to build this little gem. I also am working on a prototype build to convert 3) 1.5 cells to 9volts out adjustable up to 1A will take a great deal of research to come up with components required and also try to keep it as tiny as possible. working tiny is what I like to do
this is the size of a pinky nail on you finger and weighs 100mg it's a 2 ch IR RC reciever


this one is 3 ch



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Old 01-06-2010, 12:15 AM #25
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Default Re: Boost drivers for $2.00 -Yes it's true! (EDIT)

^nice! How much is it costing you per board?

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