Pirl Charger + 40A Constant Current Driver for Fiber Coupled Laser 

Instead of reverse polarity protection, I suggest a crowbar circuit with a large low voltage electrolytic capacitor -- something that will go "bang!" and produce a good amount of confetti if the user gets the polarity wrong. It may not offer much protection the first time, but they'll be more careful in the future.

Perperperpot

lol had to rewind to make sure the stutter was in the video and wasn't my computer freaking out

you're under rated. Among an elite group of mind blowingly good content makers on youtube. Keep at it.. your time will come.

Hey Marco ‘Styropyro’ ie the crazy later RU-vid guy, just featured your constant current source in his new IR later video

I spy a precision voltage reference PCB at 4:27, looking forward to the video :)

To get a higher current handling capability out of the same copper thickness, remove the solder mask and let the HASL drop some solder onto the track. That's how it's usually done in lower cost devices, versus going with thicker copper. If you use vias, chances are that some are going to get filled too, adding to current handling capabilities. As for reverse polarity protection, you want a diode, but not to protect against the driver putting the volts in backwards, but rather ESD across the laser diode stack itself, because even a 100V static discharge that you can't feel will kill thousands of dollars worth of diodes(don't ask how I know). Though I do have to note that a 30W fiber-coupled stack can be easily acquired on eBay for less than $150, don't know where the price in that screenshot is coming from.

Just what I needed - another favourite youtube channel.

Quieter with Marco. Look forward to seeing this in action.

Throughout my whole life I was seeking a component like the Lasorb. I was residing to imperfect zeners. Thank you Marco for introducing me. In my experience, If you just use Polarized connectors, you can forget about using reverse blocking diode.

LOVE the Crouder reference!

Mad style points for the Crowder reference!

Elektrosluch from LOM? I love your chanell even more!

Quality content, i love it.

A mosfet based reverse polarity protection would have little impact (low voltage drop) and protect some high value parts for a very cheap price. a TI LM74610-Q1 or something similar would do the job, and they are even build to fail "safe". MAX16914/15 are another similar option. There are even options acting as ideal rectifier but a full h-bridge might be overkill :-P ~30-100cents to protect the DC-DC and potentially the laser would not be too much of an investment, I would certainly consider it.

I'm all for protecting against any mistakes. If the equipment is expensive (and it is), protect it in any and all means possible. I'd make the circuitboard spill proof (turn off by default or fault), reverse polarity proof, with a fuse for over-voltage and over-current, as well as a turn off for too low current, and the ESD as you added it. Or don't add reverse polarity, just put a bridge rectifier to fix the polarity for them C:

Thank you for sharing. Could you do a video protection circuits like the lasorb ESD protection?

Charger is nice but I feel like it is trying to fill a need that good Chinese manufactures have more than covered.

i was usually taught and shown that putting a reverse polarity diode/protection chip is always a good idea and should be a requirement. While i doubt on the requirement part it is a good idea against negligence/accidents and saves in the long run. a friend recently had someone reactor #4(explode) their robot club controller as they somehow put the wires in backwards(it was even marked well to and was a screw terminal so they should of had it by memory) so its always a good idea as it can happen no matter what, in my eyes atleast.

01:08 great! Thanks for sharing!

Reverse protection with a diode? We are not brutes. Use low-side N-channel mosfet or high-side P-channel mosfet.

So its yours 4layer pcbs on jlcpcb channel:) nice!

amper per per per port ;)

Excellent

Nice!

I asked a friend who owns a high power solid state diode pumped YAG Laser how on earth they provide an control 400A at 1.7V....they don't! The simply put all the 808nm arrays in series and then they use around 10 V or so, much better to handle. But I'm afraid that doesn't help you, just saying..... Greetings from Dresden, Saxony, super cool channel!

jlcpcb, yay!

Ever disassembled a meanwell power supply? Mesmerizing watching your videos.

thumbs up for the meme at the end

The Pirl charger is quite similar to charging boards ive seen on Aliexpress about a year ago. They also had quickcharge, a wattmeter, the capability of delivering up to 3.7amps per USB port and also a simple acrylic case. So i guess this idea isn't that new, just with a nicer case. I am curious how much they wan't for it

Waw, awesome !

Some of those fibers look burned over a longer length, good luck! Likely the coupling to the diode bar is purely by proximity, so that's aligning 19 separate fibers to 100~200um emitters on a 500um pitch. The lasorb is supposed to be mounted as close to the laser diode as possible, otherwise protection against static electricity won't be as good. Edit: I didn't see there was a sequel video, the Lasorb is already moved.

Reverse polarity protection: I get to repair or replace 3 or 4 devices a month that the techs manage to connect backward to 24V supplies. This of course requires them to remove and reverse a polarized connector, but they manage it. An input diode saves a lot of cost in the long run, and is dirt cheap compared to the board and whatever is connected to it that might also be fried after the components on the board turn into wires.

Very like. Much wow!

Constant current Circus. Hahaha - Love your work.

Yay, new videwo. Upgraded videocamera? which one you got? :)

I often used to add a bridge rectifier to the front end of such things. If it was foolishly connected in reverse it would still work.

Excellent video as usual. However, a quick note on the Lasorb. It should be installed as close as possible to the diode array to benefit from the protection capability. If you are still looking for data on the diode array, the module inside is a Coherent CCP package. Also, it appears your laser goggles started moving again, hopefully in the right direction this time...

Almost furst Another really interesting video, looking forward to more of your future projects.

That PCB case seems familiar :) maybe they got inspired by my SBMS project. It looks like they glued the PCB's I paid quite a bit for 2Oz 4 layer PCB at JLC and I recived 1Oz. It was quite a bit of work to convince them that was the case (simple 4 wire measurement). The send another board that should be 2Oz so I will need to see if that is the case a bit hard to trust them now with volume production so maybe I will stay with the old PCB provider. At 40A continues that 7mOhm mosfet should dissipate 0.007 x 40 x 40 = 11.2W (around 280mV when fully ON) and that is a fair amount for passive cooling. I see there is an opamp in front so maybe you want to control that in the nonlinear region then the ON resistance is not important at all. You can control the current directly from the DC-DC converter but if you do not know the exact characteristics of the diode you likely wanted to be sure there are no current spikes exceeding the spec. Never heard of LASORB before so I needed to google that. I do not see why you will benefit from using that LASORB. For reverse polarity / ESD you can use just a simple Diode in parallel with the laser diode. The LASORB website is funny reminds me of the 90's webpages even if their product is from 2007. I should not make fun of that website as mine is written in a text editor and not that much better :)

Where did you buy tha Lasorb? also - it should be connected as close to the laser as possible... so maybe on the laser itself?

Never heard of a component named "Lasorb", good to know.

Another method to significantly increase the current handling capability of a trace is to tin it by removing the solder mask. Obviously, compared to thicker copper, this is inferior, but effectively free.

Please do a teardown of the "Lasorb"-thingy!

Hi, i am looking for a current driver (60A) and found your development. I downloaded the schematics and it looks different as in your video. Did you modify your driver?

The Pirl Charger needs a heat sink on the bottom of it and a fan. It gets really hot when charging four items at 2 amps each. I have seen 100 C and at that rate it will not last very long and I agree for the price of it needs an OLED or small color screen that shows output on each channel. Then it would be worth it.

What's that thingy you used to record the inaudible hissing sound ? 🤔

Why laser modules connector is connect together with cable? and should it remove before use?

3:55 constant current circus :D was that intentional?

You could have chosen to not have solder mask in areas of high power so you could add solder to decrease resistance.

what's that induction charger at 1:35? couldn't find it in your videos

Loved Crowder at the end! I’m sure he’d fight your side!! 😂

do you know why Motorola fast chargers make noise? the one that's adaptive (5-9-12v), the black square one, at night when charging it's noticeable and anoying

I would buy a laser driver from you. They are hard to find, and very expensive when you do find them. I am trying to modify a DPS5015 with OpenDPS for this purpose . I don't suppose you would share your schematics and/or PCB layout, would you?

Dear Marco. I saw few boards for the high precision voltage reference project. Have you one for sale? Thanks, Niki

Servus! Can you recommend some Lab Supply either used or new for thin money? On ebay i can either find those rather cheap (and nasty) ones made from chinesium with dubious data. I already have a DSOX1102G Oscar and a old broken Siemens Konstanter, which is probably unfixable (and so old, it still runs 220VAC)

Awesome video. I'd love to see the fiber laser in operation. Also why that MOSFET? It seems to have a high Rds(on) and also seems to have a 200mV drop at 40A flowing through it. At output voltages of ~3V that seems a lot. Perhaps something like this would be more suitable - assets.nexperia.com/documents/data-sheet/PSMN1R8-30PL.pdf. Also maybe add an optocoupler between the gate and the op-amp? More isolation between the power switching component and the logic level circuitry. I like the idea of a redundant MOSFET for the current switching. That way even if one fails, the others can handle the load. A reverse connect protection is ALWAYS a good idea even if it means a few more bucks in terms of components and PCB size.

Put a red lens over the display and the numbers will 'pop' and not cause eye strain.

There may be no need cause "it's my circuit and I know what I'm doing" but one wrong move and poof goes the laser. Add the diodes.

What do you wanna do with laser? 😉 Making of Petabyte DVD drive? 😏 That's in fact the strangest technical discovery in science history i've seen. Some years ago Australian University announced at all world that they have made Petabyte DVD from the ordinary equipment mostly, but they do not disclose anything about it, no schemes, no anything except wague description of how they managed to make laser in nano size and very few info of datarate, like 10Mbits/sec. I'm not sure where to get any info except find authors of this project.

Analog circuits are the best fun! btw, did you really run that without a compensation cap and got no oscillation? nice

Why didn't you put reverse polarity protection?

Do you have headphones plugged in to your scope...? What are you doing? Is that real???? What does it sound like?

What was the photo at the end from?

It's quite a shame that you order 10 of these PCBs and then usually dump 8 or 9 of these.... PS other PCB from the box looks like ultra precision/stable reference voltage on LTZ1000 ;p

0:20 what instrument is that?

Can I use an arbitery waveform generator to play lossless music

what's the distance of your lasorb from the diode? it cannot be too far to work

Do you sell any of your work?

LT1006 is US$3.90 as an SOIC part and US $3.18 as a DIP part.

I would be willing to pay for one of those power supplies

Can you share the pcb files I’m looking for such a driver as well

0:43 amper per per per port ???

what is the device @ 20 seconds?

I thought markorepairs -channel has a new name

Wait, what is a constant current driver?

Pirl… Ponies in real life? :P

@1:15 Blue light causes glare.

0:43

LTZ1000 time?

as always awesome video but i bit too much shilling with the kickstarters

Per per port eh?

🤔

German Customs are a mess. I'm not allowed to import an Eleksmaker Laser Engraver but nobody cares about this laser diode death ray. Really Cool, keep it up!

Anker usb 5 port...

Do you have a PO Box? So I can send crap?

2nd???

if all else fails, pee on it

If you drunked & then you wanna test your equipments or if you are a dummy head who don't know what he is doing then reverse polarity protection for you..... 😂😂😂.... Just use a differential connection.... (no need additional circuits) CHANGE MY MIND......

3:00 WAT DA FAQ IS THAT?

First! ;)

Too fast !