FS: ***Selectable test load up to 3A (assembled or DIY kit)*** IN STOCK!

[Lazy Laser]

Mine arrived today!

Looks good, I can't wait to start setting me some drivers

1+

 

[Jufran88]

Awesome! :beer: Let me know if you need anything else!

 

[Bristol]

So, it's ridiculous that I am actually saying this. However, after an hour and a half of searching all over the web, I don't understand how to hook up to a test load... a simple picture would be so much help.

 

[gillza]

So, it's ridiculous that I am actually saying this. However, after an hour and a half of searching all over the web, I don't understand how to hook up to a test load... a simple picture would be so much help.

Here is my awesome sketch done on my n900 just now

 

[Bristol]

Okay, that's kind what I was thinking... connect the driver to the + - on the left side, connect the... meo3ure here? Multimeter? Then, what is the jumper? Is that for the diode?

 

[gillza]

Sorry the S looks like 3. Hard to write with on that phone. Measure the voltage drop across the resistor using multimeter. The voltage drop in mV will be equal to the current that the driver is pushing through the circuit.

The jumpers are there to set and simulate the forward voltage drop that happens across the laser diode. You want to make it as close to the actual Diode voltage drop as possible. Look in my signature, there is a link to my recent 405nm build. I have explained in that thread how to calculate a Vf for 405nm diode and set it with the jumper on the load. Depending on what diode you use and what current you are pushing through it Vf will be different. Search the forum for diode specs.

 

[Jufran88]

Hey Bristol, I just replied to your PM :yh:

What gillza posted is also correct. BTW, not bad on drawing that on the n900! :beer:

 

[gillza]

BTW, not bad on drawing that on the n900! :beer:

Lol thanks! I have seen the most awesome things drawn on that phone by other users on maemo.org - maemo.org: Home of the Maemo community but my computer drawing skills are horrid to the extreme

 

[richard86]

Can anyone help? Where can I find this component ?
metal oxide 1 Ohm 5 Watt 2% tolerance resistor
Thanks in advance


Richard

 

[ARG]

Can anyone help? Where can I find this component ?
metal oxide 1 Ohm 5 Watt 2% tolerance resistor
Thanks in advance


Richard

Here you go, 1% tolerance, 5W 1Ohm
WHE1R0FET Ohmite | WHE1R0FETCT-ND | DigiKey

 

[richard86]

Thanks mate. Much appreciated


Richard

Here you go, 1% tolerance, 5W 1Ohm
WHE1R0FET Ohmite | WHE1R0FETCT-ND | DigiKey

 

[richard86]

Do they sell the 1N5404 diodes on there?
Theres loads on there but im not sure which one


Thanks

 

[mhemling33]

Nice work! I am a little late on this sale so i'll take a completed kit in your next batch please... if you don't mind.

 

[Jufran88]

Hey mhemling33! I should have one available on Monday, if you don't mind waiting. I'll send you a PM on Monday!

 

[Bionic-Badger]

Do they sell the 1N5404 diodes on there?
Theres loads on there but im not sure which one


Thanks

Since you're in the UK, it might help if you can find it at a local online electronics distributor like Farnell rather than Digikey, the latter of which is out of the US. Here's a 1% 1 ohm resistor (30W).

 

[mhemling33]

Hey mhemling33! I should have one available on Monday, if you don't mind waiting. I'll send you a PM on Monday!

Sounds good to me!