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Old 06-03-2012, 05:40 AM #817
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

This page may help as well...

LTSpice Tutorial: Part 4


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Old 06-03-2012, 06:06 AM #818
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Oh gosh I need a day off to read that proper... or play with it... I think my building electronics day's are numbered... I want something more like this...





RHD is there a board to go on my arduino nano for the ophir? I dont really care how it is powered I would like to try and test one.
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Old 06-03-2012, 10:05 AM #819
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Buy a 3A testload from jufran88. Complete and without hassle.
FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!
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Old 06-03-2012, 01:41 PM #820
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Quote:
Originally Posted by Blord View Post
Buy a 3A testload from jufran88. Complete and without hassle.
FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!
That is the load that I have. Only thing I don't like is the connections are kind of basic, FP has a more elegant choice of connectors. But you can always add your own pins or whatever.

P.s. +1 for helping and being patient. You are a big asset (<----that reads funny) to the forum!
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Old 06-03-2012, 01:57 PM #821
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

I have modified mine a little bit. Adding grappling hooks and alligator clips is much easier to work with and no soldering is required attaching to the driver.

the red wire has also a grappling hook but it just broke off before the picture is taken
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Old 06-03-2012, 05:23 PM #822
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

From my experience using regular round resistor isn't a good idea. You can't heatsink them well and when they heat up their resistance changes. When the resistance changes your voltage reading changes, so you are measuring the wrong current. In my test load I used a to-220 resistor on a nice aluminum heatsink to counter this. The resistor says plenty cool and my readings don't drift.
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Old 06-03-2012, 06:04 PM #823
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Quote:
Originally Posted by benmwv View Post
From my experience using regular round resistor isn't a good idea. You can't heatsink them well and when they heat up their resistance changes. When the resistance changes your voltage reading changes, so you are measuring the wrong current. In my test load I used a to-220 resistor on a nice aluminum heatsink to counter this. The resistor says plenty cool and my readings don't drift.
That is interesting.

It is a 5 watt resistor though. Is it heating up very much?
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Old 06-03-2012, 06:07 PM #824
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Quote:
Originally Posted by tsteele93 View Post
That is interesting.

It is a 5 watt resistor though. Is it heating up very much?
I run mine at ~1.3 Amps most of the time & its not even warm...
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Old 06-03-2012, 06:13 PM #825
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

I didn't know that too. I suppose it will do the job to 3A. I do smell a burning odor when leave it too long.
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Old 06-03-2012, 06:15 PM #826
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

I wouldn't trust it to 3A. It's only rated to approximately 2.2A through it... I^2*R is the power rating.

I wouldn't even touch above 2A.

Hell - I was using a 10W resistor on my home-grown one, and I don't like running it above 3A.
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Old 06-03-2012, 06:16 PM #827
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

I don't understand why we don't just get an amp meter of some sort and just measure the current the right way. That way you can omit the resistor entirely and just rely on what the driver outputs, not what the resistor tolerances are.

Just my thoughts.
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Old 06-03-2012, 06:27 PM #828
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Because it would be more expensive :P And, using the Vdrop from the resistor makes it easier to measure high-power LDs without 9 diodes =p
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Old 06-03-2012, 06:32 PM #829
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

PWR221T-30-1R00F - BOURNS - RESISTOR, THICK FILM, 1OHM, 30W 1% | Newark

That might work?
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Old 06-03-2012, 06:32 PM #830
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

I don't know exactly what resistor is used in those loads, but I tested a few different high wattage resistors at high current (around 2A) and they all warmed up and the resistance changed a bit when they got hot.

At 2A you have 4W, at 3A you have 9W so it's definitely gonna be getting pretty hot. If the resistor is high quality and good tolerance then it shouldn't change much within its rated range, but I like to have plenty of breathing room. The resistor is the most important part and I think it should definitely be heatsinked.

Edit: Yes that one looks good.

Last edited by benmwv; 06-03-2012 at 06:34 PM.
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Old 06-03-2012, 11:52 PM #831
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

I really like my test load I just want to increase the number of diodes on it.. that shouldnt be that hard to do.. I'm going to order some more and make an addon for it. I really like the idea of jumpers for adding a diode here and there.. and I have to buy another multimeter to test V and C so I will get a decent one.. Wish Jeff would jump in here but I know he is busy...
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Old 06-06-2012, 12:23 AM #832
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

OK, I got my scope today. Passes all self tests and to my untrained eye and to some forum members more trained eyes, it looks to be ok.

So... if someone wants to give me a quick walkthrough, I can scope a Mohrenberger BenBoost driver.

I have a TDS210 if that helps.

Let me know what to do, or you'll have to wait until I figure this thing out completely.

I'm headed off to YouTube for o-scope lessons.
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