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Old 08-19-2013, 10:16 PM #209
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

@jander6442: Oh wow! I think that's the biggest heat sink I've seen put on the test load lol.

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532nm SKY Lasers DPL - 200mW
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Old 08-21-2013, 02:04 AM #210
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Sold out until the next batch of boards arrive!
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Old 08-24-2013, 03:43 AM #211
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

I am wondering why you decided to go with a 5W resistor. At the full rated 3A, it will be dropping 3V. 3 * 3 = 9W. That is almost twice the rating. It's probably not a big deal since it's not for continuous use, but still what was your reasoning behind this? Resistors can get extremely hot even when run at their rated wattage. Like hot enough to burn boards unless they are heatsinked. With no heatsink, I usually derate them by 1/3. I'm not criticizing or anything because obviously it's proven and works well for what it was designed for.
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Old 08-24-2013, 05:34 AM #212
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

To me it was the best cost effective choice. Since it's not for continuous long duration usage they are perfect for testing drivers. Also, without having to resort to wire-wound resistors. A simple current check or setting shouldn't take longer a minute or so. Temperature drift will come into play, but shouldn't affect readings drastically.

If there is enough demand I've been thinking of using an axial style resistor with heat sink installed instead for an extra few bucks. Although, there are other heavier duty test loads out there already other than mines. Just keeping mines simple, effective, and cheap.
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445nm 1500 mA A140 SOLARFORCE L2 GUNMETAL (FLEXDRIVE V5) - link
445nm 1566 mA A140 SIPIK HK21 (G2 Drive) - link
473nm B&W Tek BWB-10-OEM - 10mW
532nm SKY Lasers DPL - 200mW
638nm 1071 mA GUIDESMAN (AMC7135) - link
638nm 1053 mA SS 26650 (AMC7135) - link

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Old 08-24-2013, 05:58 AM #213
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Makes sense It's tough to find anything over 3W that isn't wirewound and they have poor tolerance. I'm looking at some stud mount diodes here to possibly make a really high current test load for 5-10W diodes.

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Old 08-24-2013, 08:33 AM #214
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

The diodes aren't much of an issue afaik. A little heatsinking on them and they seem to be rock solid for a long time. Its the resistor that can take a beating if you run the load for extended periods. I for one haven't run mine for more than like 30 seconds at a time since it only takes 5-10 seconds to get a good solid reading on a driver anyway. However, I like overkill and actually wouldn't mind having an easy way to torture test my drivers for longer periods.

Jufran, have you looked into using two 5W 500mOhm resistors in series? I found one that is 5W at 1% tolerance for $0.62 each over at mouser. Here it is if you want to check it out:
WHER50FET Ohmite | Mouser
With twice the heat dissipation capability the resistors should be able to hold up to reasonably longer tests.

Unfortunately the 500mOhm 1% tolerance 10W resistors are $2.34 at the cheapest there. If 5% tolerance is acceptable these 10W resistors are only $0.64:
280-CR10-0.5-RC Xicon | Mouser
You could get some seriously long torture tests with two of those lol.
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Old 08-24-2013, 08:47 AM #215
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Really, even at 6.5A? Wouldn't they start coming apart? The resistor idea sounds good although it would push the tolerance to 2%. Same as the original resistor though
For even better heatsinking on those diodes, you could try cutting thorough some of that plastic. Carefully though lest you should reach the meaty core.
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Old 08-24-2013, 05:33 PM #216
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Unfortunately those are wirewound resistors =[

They tend to be inductive and mess with the switching frequencies of buck/boost drivers. I don't think they affect linear drivers though.

I did find a non-inductive wirewound, but the cost outweighed its functionality.

I did find some radial style resistors with higher power ratings (30W) that can be heat sinked properly. I would add maybe 5-7 dollars more depending on what heat sink and if it would add to the board size.
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405nm 455 mA BDR-S06J GUIDESMAN (G2 Drive) - link
445nm 1500 mA A140 SOLARFORCE L2 GUNMETAL (FLEXDRIVE V5) - link
445nm 1566 mA A140 SIPIK HK21 (G2 Drive) - link
473nm B&W Tek BWB-10-OEM - 10mW
532nm SKY Lasers DPL - 200mW
638nm 1071 mA GUIDESMAN (AMC7135) - link
638nm 1053 mA SS 26650 (AMC7135) - link

LED Maglite 3D DD SST-90 5700K w/ Aspheric lens - link
LED Maglite 3D XM-L U2 bin - link
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Old 08-24-2013, 08:12 PM #217
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Hmm, I didn't know that inductance would be an issue. Now I'm wondering exactly how it effects the driver though. I understand what inductance is but what I wonder about is how it would effect the driver which would be far enough from the resistor not to be within range of the field. Anyone have some insight on this?
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Some of the collection:
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-445nm -3.04W - 9mm@2.2A - Ultrafire L2
-445nm -2.95W - M140@2A - "Hyperion" Black Ice/Flash Freeze hybrid
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-445nm -1.93W - M140@1.8A - Blue Ice by yobresal
-450nm -1.67W - PLTB450@1.7A - Survival Laser S4
-488nm ~25mW - "The Beast" JDSU Argon Ion
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-532nm -374mW - Skylaser HL532 300mW
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-543nm ~.3mW Melles Griot HeNe
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Old 08-24-2013, 08:33 PM #218
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Switchmode drivers work on the principle of inductance. A simple explanation would be that an inductor resists a change in current. The resistance to change has a value and is measured in henries. Adding another inductance in series with this inductance will effectively increase the resistance to change and therefore the inductance. A higher inductance will cause less current to flow in the circuit. So if you attach a wirewound resistor of unknown inductance, it will reduce the current flowing into the test load by an unknown amount. Then you attach your precious laser diode without said resistor and the driver overdrives it and bad things may start happening. Even worse, the amount of error depends on the frequency and pulse width of the driver. Basically it's a design nightmare.
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Old 08-24-2013, 09:19 PM #219
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

There's also inductive kick back. Basically the inductor wants to keep current at a constant. Switching frequency drivers (buck/boost) switch on and off. Inductors don't like this and a voltage spike occurs that could potentially destroy the driver and or test load.
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405nm 455 mA BDR-S06J GUIDESMAN (G2 Drive) - link
445nm 1500 mA A140 SOLARFORCE L2 GUNMETAL (FLEXDRIVE V5) - link
445nm 1566 mA A140 SIPIK HK21 (G2 Drive) - link
473nm B&W Tek BWB-10-OEM - 10mW
532nm SKY Lasers DPL - 200mW
638nm 1071 mA GUIDESMAN (AMC7135) - link
638nm 1053 mA SS 26650 (AMC7135) - link

LED Maglite 3D DD SST-90 5700K w/ Aspheric lens - link
LED Maglite 3D XM-L U2 bin - link
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Old 08-24-2013, 10:21 PM #220
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Wow ok thanks for the info guys. What about metal oxide resistors?

I found this 5W 330mOhm resistor that I think could work with 3 in series:
MOSX5LR33J KOA Speer | Mouser

I also found some 5W 500mOhm resistors that could work with 2 in series:
286-0.5-RC Xicon | Mouser
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Old 08-25-2013, 05:11 PM #221
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Ah those would be ok. However, in series only the ohms adds up, while wattage stays the same. 2 2 ohm resistors with 5W rating would amount to 1 ohm with 10W rating (in parallel)
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Old 08-25-2013, 11:29 PM #222
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Hmm, are you certain? I have heard that the wattage adds for both configurations. It sort of makes sense but at the same time it sort of makes sense that it would add for both configurations.

In the case of setting up ballast resistors for some HeNe tubes I have Sam(Sam's FAQ) told me that using two resistors in series to achieve the required resistance would allow the two resistors to share the heat dissipation.
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-405nm -811mW - S06J@490mA - Aurora C6
-445nm -3.04W - 9mm@2.2A - Ultrafire L2
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-445nm -1.93W - M140@1.8A - Blue Ice by yobresal
-450nm -1.67W - PLTB450@1.7A - Survival Laser S4
-488nm ~25mW - "The Beast" JDSU Argon Ion
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-532nm -374mW - Skylaser HL532 300mW
-532nm -90mW - SD-303
-532nm -110mW - 50mW FastTech Module - DTR Skyray
-543nm ~.3mW Melles Griot HeNe
-638nm -1.3W - ML501P73@1.5A - Survival Laser S4
-638nm -1W - ML501P73@1.4A - Ultrafire WF-602C
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Old 08-25-2013, 11:33 PM #223
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

It adds up in both configurations. Here's an example:

@1A:

1Ohm resistor:
1V drop across, 1A through, 1W dissipated

2Ohm resistors in parallel:
1V drop across, 0.5A through each, 0.5W dissipated on each, 1W total

0.5Ohm resistors in series:
0.5V drop across each, 1A through, 0.5W dissipated on each, 1W total
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Old 08-25-2013, 11:47 PM #224
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Quote:
Originally Posted by Atomicrox View Post
It adds up in both configurations. Here's an example:

@1A:

1Ohm resistor:
1V drop across, 1A through, 1W dissipated

2Ohm resistors in parallel:
1V drop across, 0.5A through each, 0.5W dissipated on each, 1W total

0.5Ohm resistors in series:
0.5V drop across each, 1A through, 0.5W dissipated on each, 1W total
That's pretty much how it worked out in my head. Though I sort of just figured that was the case based on logic. I am not really very well versed on circuitry but I am working on it and picking things up where I can

Anyway, I may just build myself a test load with way overkill heat dissipation capabilities so I can run super extended driver torture tests. Like literally run the driver at max unheatsinked to see how long it lives and how it reacts to the excessive heat.
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NEW 1.5-2.5W 445nm Blue Ice/Black Ice/Flash Freeze Lasers FREE US Shipping!
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Some of the collection:
-405nm -811mW - S06J@490mA - Aurora C6
-445nm -3.04W - 9mm@2.2A - Ultrafire L2
-445nm -2.95W - M140@2A - "Hyperion" Black Ice/Flash Freeze hybrid
-445nm -2.2W - M140@1.8A - Aurora C6
-445nm -1.93W - M140@1.8A - Blue Ice by yobresal
-450nm -1.67W - PLTB450@1.7A - Survival Laser S4
-488nm ~25mW - "The Beast" JDSU Argon Ion
-520nm -132mW - PL520@390mA - Minisabre V2
-532nm -374mW - Skylaser HL532 300mW
-532nm -90mW - SD-303
-532nm -110mW - 50mW FastTech Module - DTR Skyray
-543nm ~.3mW Melles Griot HeNe
-638nm -1.3W - ML501P73@1.5A - Survival Laser S4
-638nm -1W - ML501P73@1.4A - Ultrafire WF-602C
-650nm -324mW - 3.8mm OpenCan@428mA - C6
-650nm -128mW - 3.8mm OpenCan@200mA - C6 (Mohgasm JAD)
Laserbee II 3.2W and 5W Ophir LPM
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