marcoreps posts
Posts: 464
Files: 717
Analog motor driver, none of this PWM rubbish™
Imagine 3 of those in a single instrument, wouldn't that be wonderful?
Linear Optocouplers
Isolating the 3 OSMU output channels has a ton of advantages. They can be connected in series for higher voltages or in parallel for higher current for example.But communicating with these isolated channels isn't easy. They need to know what voltage and what current they can put out, and they have to report back the actual values of the two parameters.That's at least 4 analog values that have to be transmitted over an isolation barrier with a high bandwidth and no delay ideally.After multiple less-than-ideal attempts, this is my latest ...
>33°C in my roof apartment :(
so sorry about the unfashionable towel :)The typical dry insect chirping ambient sound is not added in post either, it's what's going down in Germany right now.So the FPGA board is here and the to-do shelf is emptier than it been in months :)
Well, it sucks ...
Chieftain Redskin is back with the fume extractor and a master / slave switch.I don't know why my camera doesn't understand skin tones ...
And another quick one
I still have some stuff left ... but the FPGA board will arrive on Monday, practically putting an end to free time 🤔
Been awhile since I played the didgeridoo
https://uk.rs-online.com/web/p/solder-fume-extractors/7645726/RS-components is apparently rebranding a lot of out-sourced products, like this 'BOFA V200' fume extractor.Don't like the flaccid hose a lot, maybe I'll get a proper QUICK in the future
Wrong focus lens diameter
Got 20 mm lens, picked part for a 12 mm :<These are mirror and lens holders for a co2 laser machine.
Not particularly proud of this creation
but I got a cool desk without spending too much time ¯\_(ツ)_/¯
Got a very clean m² behind my bed now
This is a Vanigo A3 vacuum robot, pretty pricey at around 280$, so I thought it might be interesting to look into ...Taking advantage of the Path Recognition system, the carpet cleanersimply remembers each path it has been through and makes decisions accordingly navigated by the inbuilt Gyroscope.With each time of cleaning, it is also a process of ESLAM mapping that helps your robot cleaner get smarter and more customized for your home environment.
Fume extractor idea
I wanted to do this myself, but it seems like I am getting this one for free: https://uk.rs-online.com/web/p/solder-fume-extractors/7645726/So I am just going to leave the idea here for now.I found myself not using my freely standing fume extractor as much as I should, because 'ah what the hell, just a quick solder joint, not gonna set up anything complicated for that'. So I need a permanently installed solution, that automatically turns on when I use the soldering iron. My idea was to get an affordable (in comparison to that profession...
Giving away the worst electronic load
Haven't done one of these in a while ... the rules are simple: In 7 days the comment with the most hearts wins. I for one am getting a new, slightly better one 😋This one is okay-ish because it can actually take almost the specified power, but the UI is sooo horrible ... https://www.banggood.com/150W-Constant-Current-Electronic-Load-60V-10A-Battery-Discharge-Capacity-Tester-1602-LCD-Display-p-1255707.html
Think Camera.. Think e-con!!
I've accepted this thing for a product video >3 months ago. It's cool and all ... but I don't have time for it rn 😭It's a calibrated 'Tara' USB 3.0 stereo vision camera, meaning that one can make reasonably reliable dimensional measurements with it. It also has a built-in IMU, so theoretically one could capture larger 3D views without external precise positioning hardware.
26.5 GHz programmable step attenuator
The voodoo is happening elsewhere, this thing is surprisingly straightforward
OSMU: Which controller?
So I've been trying to find a combination of microcontrollers, DACs and ADCs that can operate 3 OSMU channels (= 12 DACs + 6 ADCs + a few digital pins) simultaneously, with reasonable speed (= hundreds of kHz or even a few MHz?) and are easy to opto-isolate.There are some attractive all-in-one solutions here: http://www.analog.com/en/parametricsearch/11289 or http://www.ti.com/product/LMP92018 or https://www.maximintegrated.com/en/products/analog/data-converters/analog-to-digital-converters/MAX1329.htmlBut my initial plan of controlling all...
Next CNC episode is getting closer
Pretty obvious which one is best - but best suited for my hobbyisch application? Not sure yet ...
Greasy goggles
Two words that are used together rarely...The nice glass-lensed UVEX pair from Mr. Hightechstuff is a fine pair of protective eyewear, but better suited for higher wavelengths. So I got another pair from a surplus shop and sure enough: Smells like an old army depot and is extraordinarily greasy. BUT: OD14 at 1060 14 at 840 nm NEODYMIUM-GALLIUM ARSENIDE it says on the plastic lens. Seems good for my 977 nm laser?
Almost GHz Active Differential Probe
Build the diffprobe from this blog post: http://blog.weinigel.se/2016/03/16/ghz-differential-probe-3.html with a few mods. I don't have a network analyzer yet, or anything near GHz so I can't really test that ... but it works wonderfully for fast differential signals like USB or HDMI and floating shunt measurements etc.Before I used this HP 1141A with it's own PSU. Took a few minutes to set up and plug in, mine is powered directly by the scope with a DC-DC converter.
It could go higher if it wasn't for sloped walls
'Flexispot' wanted a product video, I suggested 3 of these height adjustable desks ... so they sent me one and this goofy thing 😬
Found my old imgur account
With a bunch of lab liquidation hauls ... those were some glorious days :)https://imgur.com/a/k008Thttps://imgur.com/a/srqAPhttps://imgur.com/a/BOfcOAlso, some big ol wooden CNC stuff:https://imgur.com/a/lIXHEAlso my first CNC ever:https://imgur.com/a/Ja7Js
118 Years and 315 days
Spectrum analyzer pretends to have been turned on for much longer than it has existed AND for only periods of 875 ms in average. 🤔 🤔 🤔
And another soldering video 🙄
Unisolder vs. Pace ADS200You MAY have seen the first 4:40 already ...
01005 soldering & micro fluid dynamics
This is the tricky part on an 'SMD Challenge Misery Edition'.I am going to continue trying until there's no solder mask left :)
Do I have to fill it with water before firing?
Or can it take a few pew pews dry ...?
Ladies and Gentlemen: TS80
Didn't like USB power at first, but if it ends up working that well, I don't mind it :)Oh I think we still don't have any ladies here ...
After \ Before bleaching
Pretty cool! I am not sure about the cracked outer frame, but at least the buttons need the same treatment!
TS-80 Soldering Iron Close Up
Yes, it's a soldering iron. But as some of you have noted already, it's a lower power one, so I don't think it's meant to be a replacement for the TS-100. I'll do some more experiments, then video about it tomorrow!
Trying the old H₂O₂ plastic bleaching recipe
Eyeballing all the quantities, what could go wrong? (Nothing yet, don't bother watching this raw footage, I just wanted to document this to show you the result tomorrow :)
What have we here ...?
Hint: It's from Franky
Heat!
Someone on the eevblog forum has suggested to try and heat up some of the components.Worked!! Now to find out precisely which component it is ..... I hope it's not one the unobtainium Advantest specials!
