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Old 12-15-2012, 03:02 AM #145
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

How much is shipping to Brazil? first-class!


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Old 12-18-2012, 03:47 PM #146
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

How much is shipping to uk?
Il take one
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Old 12-19-2012, 10:55 PM #147
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

PMs sent!
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Old 12-19-2012, 11:38 PM #148
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Thanks mate
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Old 12-26-2012, 07:47 PM #149
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

It only took 2 days to receive mine and this thing is top quality I am a very happy! it was a nice little present on christmas eve.
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Old 01-02-2013, 03:26 PM #150
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Got mine today

Will be testing it out laser befor a laser build

Thank you
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Old 01-02-2013, 09:34 PM #151
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Awesome! Glad to hear you got it alright.
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Old 03-22-2013, 12:29 PM #152
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Hey, this might sound like a real dumbass question, but how do I know what jumper to use? I know the diode limits the voltage of the input and the resistors limit the current, but how do I know what jumper to use to replicate the load of a diode? is it per wavelength of the diode, or is it current rating of the diode? say I wanted to push a 445nm diode to around 1.8 amps, what location would the jumper sit. I'm new to test loads and I know a little bit about circuitry, but this one has me stumped. :/
Looking forward to your reply and I'm thinking of getting one of these. Also, the resistors are rated at a maximum of 3 amps, but would I be better of using a lower current test load to test low amperage driver settings?
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Old 03-22-2013, 06:14 PM #153
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Hey Roger no problem, basically you just want to get as close as possible to the voltage drop the laser diode. It depends which 445nm diode you'll be using some of them will drop 4.5V or more at that current. The diodes on the test load will drop about .7V-.9V depending on the current each so you just multiply the voltage drop and number of diodes to reach as close to the voltage drop of the laser diode.

For example you wanted to use your 445nm diode at about 1.8A

0.9V x 5 = 4.5V
0.9V x 6 = 5.4V

So you could use 5 or 6. There is a number representing the number of diodes on the side of the jumper pins.

And don't worry too much about using a lower amperage test load. As long as you know the voltage drop for each diode you should be fine. There's a voltage drop chart a few pages back that will show you how much voltage the diode will drop at a given current.
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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
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Old 03-23-2013, 01:40 AM #154
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Thanks for the reply. Would I need to PM you to inquire about shipping costs to Australia or is it alright to ask here?
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Old 03-23-2013, 08:11 AM #155
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

PM sent!
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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 03-27-2013, 04:08 PM #156
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

these are very nice test loads, i have one and like it a lot
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Old 03-27-2013, 05:07 PM #157
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Quote:
Originally Posted by Jufran88 View Post
Hey Roger no problem, basically you just want to get as close as possible to the voltage drop the laser diode. It depends which 445nm diode you'll be using some of them will drop 4.5V or more at that current. The diodes on the test load will drop about .7V-.9V depending on the current each so you just multiply the voltage drop and number of diodes to reach as close to the voltage drop of the laser diode.

For example you wanted to use your 445nm diode at about 1.8A

0.9V x 5 = 4.5V
0.9V x 6 = 5.4V

So you could use 5 or 6. There is a number representing the number of diodes on the side of the jumper pins.

And don't worry too much about using a lower amperage test load. As long as you know the voltage drop for each diode you should be fine. There's a voltage drop chart a few pages back that will show you how much voltage the diode will drop at a given current.
The calculation is flawed. You forgot the voltage drop of the 1Ohm resistor.
First subtract the voltage drop from 4.5V. That is 4.5-1.8=2.7Volt
Then estimate the number of diodes for the 2.7V ~ 4 diodes !
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Old 03-27-2013, 09:25 PM #158
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Quote:
Originally Posted by Blord View Post
The calculation is flawed. You forgot the voltage drop of the 1Ohm resistor.
First subtract the voltage drop from 4.5V. That is 4.5-1.8=2.7Volt
Then estimate the number of diodes for the 2.7V ~ 4 diodes !
So, by this calculation, the Vf of the resistor is 1.8? I am confused..I understand how many diodes you're determining. I'm not sure exactly how you determined it.

Jufran, I would like one of your DIY kits, if you have one available. PM me if that's the case.
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Old 03-28-2013, 01:52 AM #159
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

@blord: Ah, yes I forgot.


@scumbagatheist: Vf of resistor is calculated by Ohm's law (V=IR). Since resistance is 1 with 2% tolerance, V=I or Vf = I

It could be a little higher or lower depending on the actual resistance, but it shouldn't vary that much.

PM incoming.
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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

LED Maglite 3D DD SST-90 5700K w/ Aspheric lens - link
LED Maglite 3D XM-L U2 bin - link
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Old 03-28-2013, 02:14 AM #160
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Default Re: FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

Ok, but in Blord's calculation, he say subtract the Vf of the resistor (1.8) from 4.5 (presumably the diode's Vf) and has a sum of 2.7V. Why is the Vf of the resistor being subtracted from the diode Vf? I would have expected it to be additive, that is that each of the components in the circuit (diodes and resistor) are all contributing to the load on the driver. Is this not the case? And how did Blord get 1.8 in his calculation if the Vf of the resistor is apx 1V?

Thank you all for helping me learn this. It's better than a course as I can ask these kinds of questions. I think I'll sign up for one of the free online courses in electronics.
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