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Old 11-04-2012, 08:54 AM #1
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Default Super 3 Amp V2.1 test load

Well I just finished the first new V2.1 Super 3Amp test load and it works great, here is a few pictures.







As you can see there is machining involved and these are very ruggedly made so they are not cheap so think about it, you will never burn it out or need to buy an other load again.

They can take 3 amps all day long and not burn out, if you have a bunch of drivers that can do 4 or 5 amps just put a small fan on the fined part of the heat sink, it can take it

The copper heat sink model is $58.00 and the all aluminum heat sink model is $50.00 plus shipping and fees.

Copper test load


Aluminum test load


Here are some test leads I made up that will make connecting the load
to your meter much easier, they are $7.00 per set.


Meter Leads



Thanks for looking...


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Old 11-04-2012, 10:05 AM #2
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Default Re: Theres a new load in town

Man... that thing looks like a Monster....

If I hadn't built a high powered Test Load myself
I'd get one of these...


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Old 11-05-2012, 12:13 AM #3
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Default Re: Theres a new load in town

Well thank you for saying so Jerry, I have tried to make them bullet proof so they would last a lifetime.

They use 15 amp diodes and a 35 watt 1% resistor so they are pretty stout
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Old 11-05-2012, 12:58 AM #4
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Default Re: Theres a new load in town

Dang Jeff, sweet work I have your v1 it has served me very well. I used a nice bead of epoxy to reinforce some areas, but if you take care of it, it to will last a life time.
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Old 11-05-2012, 01:07 AM #5
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Default Re: Theres a new load in town

They will be outdated next year if the 50Watt diode comes out
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Old 11-05-2012, 02:26 AM #6
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Default Re: Theres a new load in town

nice Jeff- very nice-

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Old 11-05-2012, 04:29 AM #7
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Default Re: Theres a new load in town

Looks heavy I like the switch design.
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Old 11-05-2012, 04:58 AM #8
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Default Re: Theres a new load in town

I still have one of your epoxy coated ones. If I ever need another one... this one takes the cake!
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Old 11-05-2012, 06:39 AM #9
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Default Re: Theres a new load in town

Actually it weighs in at 6.1 oz which is heavy for a test load

Yes a switch is soooo much better than them little shorting jumpers for picking red or blue.

Guess I'll have to come up with something for the new green diodes now



Quote:
Originally Posted by TheDukeAnumber1 View Post
Looks heavy I like the switch design.
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Old 11-06-2012, 08:32 PM #10
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Default Re: Theres a new load in town

Wow! This is really cool thing, Jeff.
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Old 11-06-2012, 09:09 PM #11
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Default Re: Theres a new load in town

Jeff, so this has an option between red, blue, and 405? What voltage drops did you fix for these options?

Also I realise that simplicity is great for beginners but wouldnt you want to simulate the forward Voltage at specific current as close to the actual drop as you can? Having fixed voltages would not let you do that and you will not know if your driver can handle the ACTUAL load from LD. Correct me if im wrong please.
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Old 11-06-2012, 09:38 PM #12
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Default Re: Theres a new load in town

Quote:
Originally Posted by gillza View Post
Jeff, so this has an option between red, blue, and 405? What voltage drops did ou fix for these options?

Also I realise that simplicity is great for beginners but wouldnt you want to simulate the forward Voltage at specific current as close to the actual drop as you can? Having fixed voltages would not let you do that and you will not know if your driver can handle the ACTUAL load from LD. Correct me if im wrong please.
Problem is that there is no real way to actually change voltage drop and keep the same characteristics as a laser diode.

HOWEVER, this does raise a valid point. Why is it so important to keep the operating characteristics of the diode if you're just checking for the current output anyway? Theoretically you could easily make a transistor do the same thing, with variable voltage drop and still be able to get an accurate reading (with adequate heatsinking).

It would definitely come in handy for figuring out the true drop out of a driver at various currents and input voltage levels.
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Old 11-06-2012, 10:14 PM #13
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Default Re: Theres a new load in town

There is no point, any current based test load will work fine. I just short the driver through my DMM, has never failed me.
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Old 11-07-2012, 01:33 AM #14
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Default Re: Theres a new load in town

I recently was setting microboost using varable test load. Set it at one current and out of curiosity changed the jumpers on the load to lower the drop. The current has increased and driver was heating less. Perhaps it was an isolated case but after this Im trying to set the voltage drop as close to an actual drop as possible
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Old 11-07-2012, 01:35 AM #15
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Default Re: Theres a new load in town

Well, yes, The test load should also prove whether or not your driver can handle a load.

What happened Gzilla is that your driver had to work harder when your VF is higher. It has to boost the voltage more so it draws more current, and also creates more heat.

Lower VF less work, basically.
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Old 11-07-2012, 01:45 AM #16
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Default Re: Theres a new load in town

Right, I do understand this. Thus my question/concern above.
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