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Corect test load?

M

mikey395

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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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Cyparagon

Cyparagon

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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?
 
Kevlar

Kevlar

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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.
 
M

mikey395

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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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Cyparagon

Cyparagon

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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.
 
M

mikey395

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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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Kevlar

Kevlar

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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.
 
lasersbee

lasersbee

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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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