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Old 04-03-2015, 03:23 AM #1
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Default The REALLY Heavy Load - 30A test load

The underside is meant to be attached to a heatsink / fan, like a CPU cooler. Thin aluminum will be used to level the various ICs, and then arctic silvered to the heatsink.



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The REALLY Heavy Load - 30A test load-img_20150402_201834.jpg   The REALLY Heavy Load - 30A test load-img_20150402_201902.jpg  


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Old 04-03-2015, 03:39 AM #2
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Default Re: The REALLY Heavy Load - 30A test load

Finally something to handle your drivers, eh?
The pic isnt very clear on my phone, are the jacks in the back the inputs/outputs, or the diode selection?
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Old 04-03-2015, 04:05 AM #3
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Default

Quote:
Originally Posted by crazyspaz View Post
Finally something to handle your drivers, eh?
The pic isnt very clear on my phone, are the jacks in the back the inputs/outputs, or the diode selection?
Both. By choosing a jack, you choose the number of diodes.

There are also two jacks on the other half of the board for choosing between a 0.1 and 0.01 ohm sense resistor.
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Old 04-03-2015, 04:21 AM #4
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Default Re: The REALLY Heavy Load - 30A test load

I have my doubts that SMD is appropriate for 30A. I would love to test this if you ever get a fully built version. I'd even pay return shipping. I've got a thermal camera and a bench supply that considers 30A a 4% load.

Quote:
Originally Posted by rhd View Post
Thin aluminum will be used to level the various ICs,
Which of those are ICs?
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Old 04-03-2015, 05:20 AM #5
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Default Re: The REALLY Heavy Load - 30A test load

Quote:
Originally Posted by rhd View Post
Both. By choosing a jack, you choose the number of diodes.

There are also two jacks on the other half of the board for choosing between a 0.1 and 0.01 ohm sense resistor.
Then what is the rectangular socket on the left side?
Also, where'd you get the PCB fabricated? It looks really, really nice!
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Old 04-03-2015, 07:59 AM #6
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Default Re: The REALLY Heavy Load - 30A test load

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Originally Posted by Cyparagon View Post
I have my doubts that SMD is appropriate for 30A. I would love to test this if you ever get a fully built version. I'd even pay return shipping. I've got a thermal camera and a bench supply that considers 30A a 4% load.
The version pictured used slightly cheaper TO252 diodes, and they're only rated for 15A average. Another revision that's otherwise the same swapped those for the 30A TO263 diodes. I may swap for TO220 though, with neutral tabs that can be heatsinked.

Quote:
Originally Posted by crazyspaz View Post
Then what is the rectangular socket on the left side?
Also, where'd you get the PCB fabricated? It looks really, really nice!
Dirty PCBs. They're as cheap as it gets. $14 shipped for 10 giant boards. They're great for things like this with big giant traces. Not great for things like drivers.

Oh, that socket is for DMM leads, but it's not great in practice. I'm going to find an alternative.
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Old 04-03-2015, 09:02 AM #7
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Default Re: The REALLY Heavy Load - 30A test load

It looks really nice and professional! What type of diode needs near 30A!
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Old 04-20-2015, 07:44 AM #8
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Default Re: The REALLY Heavy Load - 30A test load

Oh, one big thing to keep in mind that I've noticed with testloads;

Your resistor acts like a voltage drop too. Aka, if you're using a 1 ohm resistor, at 5 amps, it'll drop 5 volts on top of your diodes.

You'd need to use a much lower resistance if you still want the test load to work right. I'm sure you've thought of that though but still, just for anyone else reading.
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Old 04-20-2015, 08:18 AM #9
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Default

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Originally Posted by Le Quack View Post
Oh, one big thing to keep in mind that I've noticed with testloads;

Your resistor acts like a voltage drop too. Aka, if you're using a 1 ohm resistor, at 5 amps, it'll drop 5 volts on top of your diodes.

You'd need to use a much lower resistance if you still want the test load to work right. I'm sure you've thought of that though but still, just for anyone else reading.
Two resistor options on this one - 0.1 ohm and 0.01 ohm
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Old 04-21-2015, 12:30 AM #10
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Default Re: The REALLY Heavy Load - 30A test load

30 amps on 10mΩ is 9 watts of heat though. The choice of solder mask makes it difficult to see if you've used kelvin sense.
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Old 04-26-2015, 12:51 AM #11
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Default Re: The REALLY Heavy Load - 30A test load

I could use on for 15 amps at 2 VDC
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Old 04-26-2015, 06:23 AM #12
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Default Re: The REALLY Heavy Load - 30A test load

Quote:
Originally Posted by Cyparagon View Post
30 amps on 10mΩ is 9 watts of heat though. The choice of solder mask makes it difficult to see if you've used kelvin sense.
The resistors are through hole, so I'm not using the 90 degree kelvin leads that you'd use under a surface mount resistor. But I am using separate leads (not part of the current path) directly from the through holes, for vdrop measurement.
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Old 05-13-2015, 06:01 AM #13
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Default Re: The REALLY Heavy Load - 30A test load

Are these being offered for sale? If so, please PM me, I don't always see responses.
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Old 06-05-2015, 08:51 AM #14
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Default Re: The REALLY Heavy Load - 30A test load

Yeah it's really great and looks so nice
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Old 06-23-2015, 11:27 PM #15
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Default Re: The REALLY Heavy Load - 30A test load

I'd love to have one of these. I think I might try and build one my self..
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Old 08-24-2015, 04:52 PM #16
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Default Re: The REALLY Heavy Load - 30A test load

RHD, whatever happened with this?
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Wavelengths - 405, 445, 447, 450, 455, 462, 464, 470, 473, 473+, <515, 515, 520, 532, 589, 635, 638, 650, 660, 685, 808, 830, 980
Projector - PD2
O-Like mini red/green to yellow module
Beam Expanders - Dragon Lasers 2x & 5x with universal adapters
LPM's - Modified AW TEC, Custom 6.8W+ Ophir
Datalogger - ARG
Chargers - Ultrafire WF139, (2) Xtar WP2, Nitecore i2, UM20, (3) i4, (2) D4 , Opus BTC-3400 V2.2
Phlatlights - Jayrob PT-54 green 1000lm maglight, PT-54 red project box build, (3) PT-54 red, (2) PT-54 orange (3) PT-121 red, (2) PT-121 blue, (1) PT-121 green project work in progress 5000lm (1) PT-121 green

Links:

**"Pen Laser Thread"**
"Post your pics of unique builds no-one else has"
"Make your way overspec $5 pen focusable"
"Share your inexpensive builds thread"
"Pman special"
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