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Old 07-14-2011, 02:13 AM #1
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Default Corect test load?

hi
im on my way to making a driver for my laser
but first i made the the test load, it consists of 5 N41001 diodes and 1 1ohm 1/2 watt resistor
i have read about test loads and wat they are meant to do
but im just want to run this by every1 that can tell me that ive done it correctly and sorry for the blurry vision
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Old 07-14-2011, 02:32 AM #2
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Default Re: Corect test load?

I assume you mean 1N4001 which is rated for 1A, but a half watt resistor can only handle 0.7A

Are they in parallel? Unless you have some fancy wiring underneath the board, that's wrong. I only see 4 diodes. Your color-coding of polarity is also backwards. We'd need a pic of the underside to be sure.

Also, which driver?
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Old 07-14-2011, 02:48 AM #3
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Default Re: Corect test load?

Yeah, like Cyparagon said, a nice CLEAN, close-up shot of the underside is needed to be sure. That pic is pretty blurry but I think I see 5 diodes.
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Old 07-14-2011, 04:22 AM #4
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Default Re: Corect test load?

yea sorry i meant 1N4001, yea theres 5 of them heres the picturres of the driver im going to be applying the test load to, theres the test load and the soldering om the test load, and the driver (sorry for the blurry vision again, its the best i can get)
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Corect test load?-front.jpg   Corect test load?-driverr.jpg   Corect test load?-test-load-soldering.jpg  

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Old 07-14-2011, 04:48 AM #5
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Default Re: Corect test load?

That's not much better. Maybe if you can draw it or borrow someone else's camera? It still looks to me like they're in parallel.

What power source and diode are you using?

You don't need a test load for linear regulators. Just put your ammeter on the output.
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Old 07-14-2011, 05:00 AM #6
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Default Re: Corect test load?

hope this pic helps
the power source will be about 7.2v
and the laser diode is from a 16x dvd drive (red)
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Old 07-14-2011, 11:31 AM #7
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Default Re: Corect test load?

It's still really hard to tell, do you have a macro setting on that camera?

Like Cyp said, it sure looks like they are in parallel and they should be in series.
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Old 07-14-2011, 11:32 AM #8
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Default Re: Corect test load?

In your drawing...put lines between the diodes to
show how they are connected...
As is in that drawing all the ends of the Diodes and
Resistor are floating... (not connected to anything but
the board)..

Jerry
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Old 07-14-2011, 02:25 PM #9
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Default Re: Corect test load?

May I direct you to my thread... I show a video tutorial as well as have images to build a simple dummy load capable of over 1A current.

Here's the link...
How to make a selectable Dummy Load - VERY in depth

Let us know if you have any further questions.
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Check out my How to Build a Selectable Dummy Load Thread!
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