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Old 05-01-2017, 09:06 PM #1889
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Default Re: Post your random pics!

Quote:
Originally Posted by Cyparagon View Post
Weapons-grade vibrating cock ring.

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Old 05-01-2017, 09:16 PM #1890
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Default Re: Post your random pics!

Quote:
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Weapons-grade vibrating cock ring.
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Old 05-02-2017, 01:14 AM #1891
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Default Re: Post your random pics!

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Weapons-grade vibrating cock ring.
Not quite but it's going to be just as much fun
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Old 05-02-2017, 01:32 AM #1892
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Default Re: Post your random pics!

Looks very promising, will this device emit photons?
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Old 05-02-2017, 03:27 AM #1893
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Default Re: Post your random pics!

Yes and no. It will emit photons but they won't be coherent and that won't be its primary purpose

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Old 05-02-2017, 02:40 PM #1894
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Default Re: Post your random pics!

Quote:
Originally Posted by will manners View Post
Yes and no. It will emit photons but they won't be coherent and that won't be its primary purpose

Giant LED flashlight?
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Old 05-02-2017, 11:25 PM #1895
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Default Re: Post your random pics!

Since we are playing the guessing game here, is it a wheeled device you might be able to ride in or carry some load and it has headlights, or some other type of lighting?
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Old 05-03-2017, 01:43 AM #1896
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Default Re: Post your random pics!

Quote:
Originally Posted by paul1598419 View Post
is it a wheeled device... and it has headlights, or some other type of lighting?
Yes!! It's a DIY electric skateboard It will have headlights, brake lights and turning signals. For science I may attach lasers to the front and ride around,
(in a controlled environment of course!) The lights will draw power via a buck converter connected to the 42V battery pack.

I'm expecting a max 2KW power draw, with a max of 57A per a motor (mainly for startup torque, they won't reach that current at full rpm),
hence the 40 Samsung 25R batteries, hopefully they don't explode. It will have a bluetooth interface connected to the ESC which will feed live
data to an android phone which can be logged for later reference. Here's a screenshot of the data interface overlayed onto a video.



It's an expensive hobby. I've spent well over a grand on parts already and it's nowhere near finished. Part of the reason I'm not as active as I used to be
because you develop new hobbies which are order of magnitudes more expensive... and before you know it you're eating noodles for the rest of the semester.
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Old 05-03-2017, 03:50 AM #1897
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Default Re: Post your random pics!

"Hopefully they don't explode!"

No, that wouldn't be good!

Interesting project, looking forward to seeing more.
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Old 05-03-2017, 04:32 AM #1898
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Default Re: Post your random pics!

It ought to be something to see when it's done, Will. You must post photos when it's done and working.
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Old 05-03-2017, 07:16 AM #1899
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Default Re: Post your random pics!

Quote:
Originally Posted by diachi View Post
"Hopefully they don't explode!"
Yep, well they're samsung cells so it's kinda expected

Quote:
Originally Posted by paul1598419 View Post
It ought to be something to see when it's done, Will. You must post photos when it's done and working.
I've posted a thread on the esk8 forums if anyone's curious.

Boosted clone deck | 10S4P | JLabs Dual 6355 | Dual VESC | Black 90mm | Carbon

Here's a few more photos from that thread.






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Old 05-03-2017, 11:54 AM #1900
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Default Re: Post your random pics!

Quote:
Originally Posted by paul1598419 View Post
It ought to be something to see when it's done, Will. You must post photos when it's done and working.
Great project Will, thanks for sharing, and yes, we will require more photos, and maybe a nice video of you speeding along on this badboy!
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Old 05-04-2017, 05:37 PM #1901
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Default Re: Post your random pics!

This is my latest project, a (really very basic) high power constant current laser driver. Designed to be controlled (Current set will be adjustable from 0%-100% in 1% increments) and monitored (LD Current + LD Voltage) by an Arduino. Going for 20A with this first design, although you can really just keep adding power transistors to increase the limit. This is the first revision, it'll need some improvements (layout could do with some work) and probably some fixes. Ordered the components for the first prototype earlier today.

Would be nice if I could do double sided boards at home easily...



Next task is to add a couple TEC controllers and perhaps some other features.
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Old 05-04-2017, 06:56 PM #1902
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Default Re: Post your random pics!

So, I guess this is to drive a pump diode for some SHG line output. Interesting.
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Old 05-04-2017, 07:38 PM #1903
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Default Re: Post your random pics!

Quote:
Originally Posted by paul1598419 View Post
So, I guess this is to drive a pump diode for some SHG line output. Interesting.

Yep, I've got a couple 15-20W 808nm PM fiber coupled bars sitting around, ideal for end pumping a large chunk of Vanadate. That said - there's no reason this couldn't drive a bank of NUBM44s either.

Downside is that it's linear, so very inefficient. I can reduce losses in the current sense resistor by picking an appropriate resistor and turning down the Vref voltage, which can also be used to set the max operating current for a given resistor size. Still won't come close to a switching supply but I'm not quite ready to tackle one of those yet.

Can't seem to find any Molex KK 3.96mm pitch 7 pin connectors on eBay, may change that out for 2.54mm pitch or just go up to 8 pin 396. Or 6 pin and just leave the GND pin disconnected.
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Last edited by diachi; 05-04-2017 at 07:41 PM.
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Old 05-04-2017, 11:29 PM #1904
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Default Re: Post your random pics!

Not that you asked, but there are several problems I can see already. I made a couple of these a few years back, but minus the digital.

Those traces aren't nearly large enough for 20A. The opamp you've chosen can't supply enough drive current unless you're using a particularly large darlington. At 20A, the darlington will be dissipating a MINIMUM of 40 watts. And that's only if you carefully select the input voltage. Even if you get a darlington rated for 120W, it's going to probably overheat unless you do something goofy like actively cool the heat sink it's on. There's no reason the rating of the cap across the diode needs to be as low at 5V. It is bad practice to leave unused op amp inputs floating, as it will often cause oscillations. It looks like you've attempted kelvin sensing of the laser diode voltage, but they should be AT the LD terminals, not a few mm over. Even then, it's not particularly helpful since your voltage drop on the power leads isn't nulled. Also, you need kelvin sense on the negative side of your shunt to get any decent accuracy.

Quote:
Originally Posted by diachi View Post
there's no reason this couldn't drive a bank of NUBM44s either
*points to the 5V cap again*

Oh, and you'd need to scale down the voltage on the sense line. Arduinos don't last long with 40V on ADC pins.

Quote:
Originally Posted by diachi View Post
I can reduce losses in the current sense resistor by picking an appropriate resistor and turning down the Vref voltage..
Yes, but this increases noise and risk of oscillations.
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