marcoreps posts
Posts: 464
Files: 717
3 Power Supplies: Past, Present, Future
I think it is possible to turn the Siglent into a 1 mV 1 mA resolution semiconductor curve tracer with NI LabView. Would that be interesting to anyone? I had some problems connecting with the free evaluation version of the software, so I didn't pursue that any further for now ...
Wonder if Siglent knew what they were getting themselves into
when asking me for a product video 😈
Laser drivers shipped to 'customer'
I thought they needed a little bit more thermal head room, so I mounted them on these big 100x100 mm heat sinks.There are a few more hotfixes and combined with suggestions from the last YouTube video I think this calls for a revision 2.
Good thing we won that twitter thingy
They even included a spare ES121 gearbox ... maybe there's hope still for a brushless ES121?
Lapping is surprisingly hard work
And what is shown is not even perfect. I suspect that grains from the coarser lapping film got embedded in the epoxy at first and caused the scratch later. Will try again tomorrow and am hoping to finally start lasing then.
Another Patron-Package with Hightechstuff
How does one acquire spacecraft parts?
All work no fun vid about USB charger and laser driver
I've accepted a boring USB charger because I needed one and the guy was nice 😑Also I wanted some verification of my laser driver circuit before connecting anything expensive to it.
Lazer driver: Done.
I've used a differential probe to look at the current shunt voltage during interesting events like power up, power down, connect and disconnect of the control voltage input etc.That way I can see even short transient events, which might not be picked up by a current clamp.The only things that could kill a laser are electrostatic discharge (which a Lasorb should absorb) and connection of the laser module while driver is turned on and trying to source current into an open connection.The driver has a 40A fuse at the input because good practice...
Giving away the Sunfounder PiCar-V
With a Raspberry Pi, with the standard USB webcam, but not with the thermal camera. I have some more plans for that :)Most hearted comment in 7 days wins. Go!
Laser emitter simulator?
Oh boy, we've reached the 500$ Patreon goal, haven't we? Does that mean I have to move out of my cozy apartment? :LI've assembled a laser driver and found an old phase control thyristor module, that has almost exactly the same forward voltage drop as my fiber laser when using its diode and the thyristor in series.That way I can stress test the driver and measure / correct parameters like turn-on-spikes, slew rate, modulation bandwidth, thermal dissipation etc. without taking any risk with the actual laser.In case of miscalculation I...
This video didn't want to end.
Not sure if this guy is legit, but he promised a few ES121s for the winner to give away, so why not: https://twitter.com/Mini_Cen/status/983523553793327105
Laser driver boards arrived
My first 'high current' design ever. Since they don't charge extra for excessive amounts of vias I thought I'd add a few more :)
Motor video tomorrow!
How did it get so warm so suddenly? 2 days ago I had to wear gloves and scarf to walk the dogs and today we had to trespass on this "private property" to cool down.2 days ago: https://www.youtube.com/watch?v=udibMERzpJ8 (Don't mind the video, I just had to vent my frustration with the manure-hoarding, animal-abusing, monsanto-spraying farmers around here ... )Anyways the precision motor video is only missing one more segment which should be done tomorrow. It better be, because I have to start right away with the next one about a few...
Precision motor chaos
Trinamic and ODrive were a bit difficult to set up, but now all are chugging along nicely!I've got a feeling that the blue Chinese hybrid thing will be my choice for the CNC machine and ODrive will be the motion control system for the new laser machine or a robot arm that might be coming ...Trinamic is also wonderful obviously, but they are really a chip manufacturer and since I am building a CNC machine and not a stepper motor driver I don't really want to work on a component level this time.
50A DC-DC converters *_*
https://power.murata.com/data/power/okr-t50-w12.pdfWhat do you think about the pinout on page 9? What exactly is pin J13 aka Vin- connected to?
Got a fiber cleaver and lapping paper
To re-arrange and polish the fibers of this thing: https://www.youtube.com/watch?v=VV05Knn-4goUp to 0.3 micron = ~12,000 gritThat enough? 🙄
Giving away 3 TMC2208 stepper drivers
Happy Easter if that is a thing where you live :)The most hearted comment in 7 days wins these wonderful Pololu-compatible Trinamic drivers (and a cool sticker).
Do me a favor?
Go back 3 posts and give your favorite comment a heart. Click twice 'load more comments'.I'll gladly give away more stuff, but I want clear results!
HT02: Heat seeking robot from cheap thermal camera
Pretty cool and easy to use sensor in this one. I wonder if one can buy them in small quantities.
Made an adjustable motor dynamometer
for repeatable load testing in the next CNC episode. To give the BLDC servo a chance I needed it to be switchable while running.It's super simple too: The rotary switch shunts the two stepper motor phases with equal resistances between 4 and 0 ohm, the on/off switch just disconnects everything.
Giving away the TS100 suitcase with spare parts
The TS100 itself is broken, needs new MOSFET, spring contacts and display (someone must have carelessly used a hot air blower on that poor thing ...)You know the drill, most hearted comment wins in 7 days :)
Any fiber laser experts here?
Are modules like this replaced routinely even if not broken yet? ("Is it likely that this thing has already served a few thousand hours?")What if I wanted a small round dot? Rearrange the fibers, get a lens, remove the fibers or get a laser rod and try to DIY a Diode-pumped solid-state laser?What's with the black ends on some of the fibers? Are they damaged or not properly cut and being burnt? Do I have to take care of that before powering the thing or is it safe to ignore for now?
Next CNC video is about to start ....
Just gotta wait for 1 more contestant which is currently in Frankfurt undergoing customs examination ... for the last 6 days btw ...
Can I post google hosted video links here?
That'd be a really useful feature, because I could just share directly out of the automatic backup, without going through YouTube ... ah well, it was nothing exciting this time, just some foamy drinks with a lemon https://www.youtube.com/watch?v=7TgxQ2F_lzo
Package from a Patron
Thanks Jonáš :)
Giving away 2 'KX' voltage reference PCBs for LTZ1000
The comment with the most hearts in 7 days gets a perfect one, the second place gets a working one with a ground off corner :) Free shipping, but the components for it are partially hard to get. Article about the board: https://xdevs.com/article/kx-ref/
