metal–oxide–semiconductor field-effect transistor
Good call it may say it's a transistor, but it's does say "field-effect transistor" and acts more like a vacuum tube, then a straight dual P/N junction transistor that's either NPN or PNP I'm just defining the difference between the two even though they both either switch or do gain
Sort of like a Triode and a Pentode , both are " Vacuum tubes" , and they both either switch or do gain for amplification . But their functionality on how they operate internally is different due to how it's manufactured
Found a nice video what the HTC Vive tracker does:
Here is an explanation how it works, includes the video as well. Accuracy is about 1.5 mm, and it even works with just one station (with less accuracy).
I once tried a HTV Vive VR, and it is amazing how good the tracker is. But the headset was not very comfortable, and the field of view and display resolution not that great, and at least when I tried it, the image was only sharp in a small area, e.g. I couldn't read text when it was not in the center. Maybe needed some calibrations or adjustments. I tried a Microsoft Hololens as well, and it was much better, but much more expensive as well.
@Dave,
The serrations you noted in front of the image sensor on the scanner are called baffling. The purpose is to mitigate stray light issues. The image sensor does a good job absorbing the light, but light coming into the system can be off-axis and bounce off the sides. In general, this would reduce the SNR of your resulting image or create false images and ghosting. Another method to mitigate stray light is the finish and painting of the optical channel. This is one of the practical applications Vantablack.
Related reading:
https://www.newport.com/t/stray-light-in-monochromators-and-spectrographs
"Don't eat the desiccant" such wise words... I wonder if bigclive eats his?
"Desiccants are the most common foreign object ingestion by children under 6 years of age"
Sounds like the choking is the issue, so probably best to eat them in small pieces.
I remember a huge thread here on the forum about development of a high voltage power supply for Nixies, was that the same guy? Must have been about half a year ago.
HTC Vive VR Base Station has what looks like two spinning laser lines
the corrugated or ripple laser lens on the side of rotating drum outputs a sweeping line.
laser beam gos down the middle, axis of the drum. rotating cylinder & mirror.
two spinning laser lines give you X & Y if your motor degrees of rotation is a know value.
by timing your laser lines a 3D space is mapped out. robot eyes
the tools & Bits
quality hand tools gos next to quality test equipment.
a must have. for my bench.
Those USB to CAN adapters are handy for debugging, or capturing traffic for reverse engineering.
I should be doing more CAN stuff at the moment, but the last CAN device I bought of ebay isn't turning up
Seems there are two versions of the Hadou, bare PCB and cased, so Dave actually has two of these.
Dave, when you said you didn't have a 40W resistor on hand that was a bit cringey for me. you have $10K in oscilloscopes but you don't have a $3 dummy load? I went on ebay. you can get a 300R and a 500R for $2.20 USD with free shipping. close enough to 810 Ohms to test that nixie driver. please do a part two.
https://www.ebay.com/itm/25-50-100W-0-01-5k-Ohm-Watt-Shell-Power-Aluminum-Housed-Case-Wirewound-Resistor/152815608794at work we have a 600A dummy load built into a (stolen?) shopping cart. we don't have current sense shunts over 150A though. we do all the power supply calibrations at 150A or 140A. then we load test at up to 600A.
Dave, when you said you didn't have a 40W resistor on hand that was a bit cringey for me.
I agree. That PSU claims 40W (although I don't know why you need to go that high, I am sure my small tube display draws 5W ish... Maybe big tubes need more). We want to see it cranked up to 11 with smoke coming out and some FLIR action.
Good idea with a short follow up video for the Nixie power supply. In the mailbag video, I expected that he would at least test the short circuit protection with a screwdriver or something, when he measured the voltage. Sometimes they are a bit optimistic with such claims
Would be a very useful device for me, someday I plan to finish my
Nixie clock. Price is a bit high, but if it meets the spec, and doesn't cause EMC problems etc., I would pay it.
"Don't eat the desiccant" such wise words... I wonder if bigclive eats his?
"Desiccants are the most common foreign object ingestion by children under 6 years of age"
Sounds like the choking is the issue, so probably best to eat them in small pieces.
Apparently eating desiccant isn't an issue at all.
"Silica gel is chemically inert and is considered to be non-toxic. The concern with this substances it that it can be a choking hazard (this is why these packets often say ‘DO NOT EAT’ on them). If your child is choking on silica gel, call 911 immediately."
Hi all,
This is Kevin A. I'm the guy who made the nixie power supply.
I did drop ship Dave the same resistor I used for load testing from Digikey. Hopefully he does a follow up with some load testing.
I did also take some FLIR images and videos of the supply running at a 200 milliamp load on the high voltage. You can check it out at the bottom of the post I did on this topic at:
https://neonkev.com/2019/10/15/success-201-boost-at-40-watts-without-a-transformer/
that robot warehouse ...
3months after their robot video
some faulty battery charger starts a fire
>GBP100 million lost
Some decent coverage here:
https://www.bbc.com/news/uk-england-hampshire-49071456Some key points from the article:
- fire started in a robot's battery charger
- not detected by fire detection system
- engineer noticed the fire half an hour later
- sprinkler system activated, but was disabled for five minutes while they attempted to fight the fire by hand
- this allowed the fire to spread to the point where most of the facility was impacted
- 400 staff laid off
Why not load the 180V power supply with a 240-volt incandescent light bulb? Better than not being able to do the test at all.