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Old 06-07-2011, 03:52 PM #1
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Default My new baby 6A Dummy Load

I recently built my new dummy load. I use 1N5408 diode, ten of them. Can hold up to 6A 1000V.
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Old 06-07-2011, 04:17 PM #2
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Default Re: My new baby 6A Dummy Load

Nice Work!

At 6A you need Heatsink/Fan
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Old 06-07-2011, 04:26 PM #3
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Default Re: My new baby 6A Dummy Load

I will put it on later, but mostly use under 3A. Fan is not necessary.
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Old 06-07-2011, 04:29 PM #4
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Default Re: My new baby 6A Dummy Load

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Originally Posted by wee40811 View Post
I will put it on later, but mostly use under 3A. Fan is not necessary.
For my 3A i use fan.
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Old 06-07-2011, 04:34 PM #5
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Default Re: My new baby 6A Dummy Load

I'll see what will happened later on. I use a massive 5W resister. we'll se if it can hold.
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Old 06-07-2011, 05:23 PM #6
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Default Re: My new baby 6A Dummy Load

Nice Work. I alway like looking at other testload/dummy loads that members create.

What ohms resistor do you use that is in between the 2 connectors in the very front.?

That 5W resistor is big but i would not call it massive. It will take ~3A for about 15-20 second but after that it will be to hot and you will see the heat coming off the thing.

A 10 watt one would help out alot but not sure if it will even mater at 6A. Or add a heatsink on top of the diodes an resistor.

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Old 06-07-2011, 05:52 PM #7
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Default Re: My new baby 6A Dummy Load

The small one is for discharging the drive. It's 2.7K ohms. I have some 30Watts resister on hand I will see if it fits or some how fit it on the board.
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Old 06-07-2011, 06:06 PM #8
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Default Re: My new baby 6A Dummy Load

Radioshack sell ones that are basically the same size as 2 of the board you used. There like $2 Bucks.
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Old 06-07-2011, 06:48 PM #9
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Default Re: My new baby 6A Dummy Load

Nice work. The ability to use a jumper is pretty neat.

A word of caution, though. Those diodes still get HOT under load. I used similar diodes for my test load (1N5404 rated for 3A), and I didn't give much thought into heat because they had such a high rating.

I wired them point-to-point with a 10W resistor, and when I used my test load to set my driver at 1.5A, the diodes got so hot after a couple minutes they melted the solder. So yeah don't use it for too long and let it cool off between uses. Doesn't matter what the rating of the diode is, it's still gonna get HOT.
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Old 06-08-2011, 03:51 AM #10
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Default Re: My new baby 6A Dummy Load

Why 6A? Show me a diode powered by a buck/boost that needs 6A. Hell, show me a buck/boost capable of reliably running a diode at 6A.

Each one of the diodes will generate ~6 watts of heat at full load. If they're in close proximity like that, they'll probably melt the solder.

6A across that 5W resistor means 36W of heat. Good luck with that.
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Old 06-08-2011, 03:59 AM #11
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Default Re: My new baby 6A Dummy Load

Quote:
Originally Posted by lazeerer View Post
Radioshack sell ones that are basically the same size as 2 of the board you used. There like $2 Bucks.
Well there were two of them together, I just cut one of because I don't need it.
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Old 06-08-2011, 04:10 AM #12
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Default Re: My new baby 6A Dummy Load

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Originally Posted by Cyparagon View Post
Why 6A? Show me a diode powered by a buck/boost that needs 6A. Hell, show me a buck/boost capable of reliably running a diode at 6A.
There are some 750mW green portables that probably run off IRs in the range of 5 or so Watts - and presumably take nearly that amount in Amperage to drive. They probably use buck drivers.
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Old 06-08-2011, 04:14 AM #13
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Default Re: My new baby 6A Dummy Load

If you want wattage just buy a 200watt cheapie 1 ohm resistor. No heat sinking required and a god insane amount of current can be pumped through it. Only danger is you have to be careful about high wattage resistors. They are wire wound and thus you can get something called inductive kickback that can hurt all sorts of things.
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Old 06-08-2011, 04:18 AM #14
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Default Re: My new baby 6A Dummy Load

What type of resistor is that? It looks like a sandstone wirewound type to me. If it is a wirewound, It is most likely inductive.
According to Dr Lava, if you use an inductive, wirewound resistor on your test load, you can burn out the inductor if used to set a boost driver. I'd suggest swapping that out for a metal oxide or a thick film type resistor.

Edit ^^^^^ some random person must have posted seconds before me
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Old 06-08-2011, 03:27 PM #15
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Default Re: My new baby 6A Dummy Load

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If you want wattage just buy a 200watt cheapie 1 ohm resistor.
Or a shunt with 5+ times the current capacity and 99% less heat, perhaps.
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Default Re: My new baby 6A Dummy Load

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Originally Posted by Cyparagon View Post
Or a shunt with 5+ times the current capacity and 99% less heat, perhaps.
Very good point...should have thought of that.. a shunt would work provided whatever wires you hook to the shunt have less resistance then the shunt itself. Otherwise you would drop the power across the wires which isn't always a good thing. 20A shunt can cost >8 bucks... and i'm sure they make them for much hire wattage. I just happen to have a few 20Amps on hand.
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