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Smart Phones / Re: Phone sensor fusion demo
« on: January 02, 2024, 06:23:09 PM »
That looks quite cool. Would you mind sharing your code? I'm interested in it.
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Smart Phones / Re: Phone sensor fusion demo« on: January 02, 2024, 06:23:09 PM »
That looks quite cool. Would you mind sharing your code? I'm interested in it.
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General Chat / Re: PCB Test point, probe insert« on: July 06, 2023, 05:09:05 PM »
Hello,
I did some research and found out that those Tektronix things were released in 1998, which is probably because it is so hard to find them. I didn't find any similar products from other manufactuers. There is this thread, but there isn't a satisfying answer: https://electronics.stackexchange.com/questions/491355/oscilloscope-probe-points But I did find this video of someone building something similar. You could adopt the construction to make it vertical, I'm pretty sure: 3
Computers, Microcontrollers, Programmable Logic, Interfaces and Displays / Re: CPU Stock Cooler Failure on My i7-4970K Rendering PC« on: February 24, 2021, 07:55:40 PM »
I think I found a motherboard worth considering: MSI B550-A PRO
It can flash the bios without a CPU installed, it has a good enough VRAM for non-overclocked (to lightly-overclocked) CPUs, good connectivity, Diagnostic LEDs, an ok price, and good reviews. And this might be an unpopular opinion, but the ryzen 7 3700x from last generation is still a good CPU and offers better price to performance than ryzen 5000. So if you are after a good value that's it. For Ram there are too many kits. You should look for something like:
As a boot drive
I think you should wait to buy a GPU and make do with what you currently have in your build. And you don't have to get a stronger PSU if you don't get a new GPU. I hope this gives you some sort of direction to make your own decisions. EDIT: I thought about it and the ryzen 7 3700x is a pretty nice option. 4
Computers, Microcontrollers, Programmable Logic, Interfaces and Displays / Re: CPU Stock Cooler Failure on My i7-4970K Rendering PC« on: February 19, 2021, 08:02:48 PM »
In my opinion, Ryzen is currently better for a productivity-oriented build. Depending on your budget I would recommend a 5900x or 5800x (or maybe a 5900, or 5800 when those come out). The 5600x is also a good CPU, but I'm not too sure if 6 cores are enough for you.
But objectively it is not a good time to buy a new pc. The prices are crazy. You should really consider waiting for the prices to come to a reasonable level and use the other cooler in the meantime. In Austria, for some products, the prices are not too far off, from the recommended price, but for others... If you tell me what you want from your PC, I can go into more details. (ie: Price, Formfactor (tower to itx), how futureproof should it be, what do you use your pc for, RGB??) I'd be happy to give you a list of components. 5
General Chat / Re: Tesla coil records and extremes« on: January 28, 2021, 08:35:36 AM »Saw this youtube claim for longest DRSSTC arcs at 3.48m: Isn't it meant like a record for himself? 7
Electronic Circuits / Re: Server PSU Hack - HP DPS-800GB A, 12VDC 1000W« on: July 11, 2020, 04:45:18 PM »
This kind of trick works with most computer PSUs. As a tutorial here is one for an ATX PSU: On proprietary PSUs, it will probably be harder to figure out what contacts to jump.
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Solid State Tesla Coils (SSTC) / Re: Freewheeling diodes are burning« on: May 14, 2020, 06:56:16 PM »
Yeah the primary is great. I just wanted to make sure the bridge output isn't just floating, but that there is an actual load.
Quick question, what exactly did you change for that improvement? Just a bigger cap? 9
Solid State Tesla Coils (SSTC) / Re: Freewheeling diodes are burning« on: May 14, 2020, 05:21:49 PM »
Hi,
I guess the yellow graph is the Gdt output? I think that the voltage for the driver IC's drops too low during switching. Do you mind scoping the 12V on the driver IC? If thats the case a big cap might fix it. Do you currently have any pseudoload at the bridge output? That could result in some spikes too. You should twist the wires from the Gdt in the corresponding pairs. Twisting Green and White for example might even be counterproductive. 10
Solid State Tesla Coils (SSTC) / Re: SSTC GDT troubleshooting« on: May 14, 2020, 08:08:24 AM »
There is this website which is a great source for gdt troubleshooting. There are the most typical problems listed and how to fix them.
http://www.richieburnett.co.uk/temp/gdt/gdt2.html I think when testing the gdt's performance, you should use a frequency close to the driving frequency of the tesla coil (I guess 200kHz-300kHz). Additionally you should connect the secondary of the gdt to the load i.e. mosfets, resistors, diodes or whatever you plan to use, to get as close to realworld testing as possible. (you dont need to have the bridge finished or even powered on for the first tests) You should post some pictures of the driver board and setup. If there are any errors, someone might be able to spot them before they become a problem. 11
Computers, Microcontrollers, Programmable Logic, Interfaces and Displays / Re: VPN and IP spoofing« on: December 19, 2019, 06:40:38 PM »
No lawyer, just an it student here. Therefore I can only comment on the technical aspects.
I wouldn't think they could just say the IP address in court with out the actual packet data. Another thing to consider is that the public IP i.e. the one seen from the internet, belongs to the ISP. Most of the time the ISP uses 1 public IP to serve multiple endusers, meaning that multiple people connect through the same IP to the internet/look the same. The backtracking who sent the packet can only be done via the ISP. To my knowledge only enterprises have their own IP, which can be tracked directly to them. To me it sounds like your friend used a torrent client, to download the game. Google "torrent filesharing" if you want an explaination, but in short by downloading something, others can download the same thing from you. For this to happen, you dont need to configure your router or any firewall. It happens pretty much on its own. So unfortunately she could have done it on accident. Although this would only work if her PC was running while she was away and starting the PC while not physically there would be pretty much impossible for a normal enduser. No VPN would make that happen. Do I understand correctly: A lawfirm downloaded the game from your friend? To me it sounds like the lawfirm was fishing for a case. I think you should contact a lawyer yourself. Edit: You might want to post your problem on reddit https://www.reddit.com/r/legaladvice/. I think they can be of more help from a legal perspective. PS: If you dont mind, keep us updated with how it plays out. 12
Solid State Tesla Coils (SSTC) / Re: Full bridge much "weaker" than half bridge?« on: December 11, 2019, 03:11:42 PM »
try switching the connections of the gdt on the driver side. It sounds like a polarity issue
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Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Problems with my first DRSSTC« on: September 24, 2019, 10:40:36 PM »
Isn't that a 1:1 Transformer? The white wire has 1 Turn on each other Core. You would need the brown wire to have a single turn on the middle core and the white wire one turn on the blue wire core.
That might be the source of your problems Turns out it is not, my bad. 14
Solid State Tesla Coils (SSTC) / Re: SSTC not getting interrupted« on: September 11, 2019, 02:38:40 PM »MCP14E5 is only available in smd package.It's not Can you suggest me some suitable gate drive IC's in THT package?There is a whole family. like the msp14e11. You have to search yourself. Look for something with
The datasheet tells alot, like what gatecharge the chip can handle and you have to match it with your other components. Can I use IR2184? It's maximum current output is only 1.8A so could that be a problem?Probably not, but the chip has long delay times, which result in switching losses (which are bad) 15
Electronic Circuits / Re: I need a developed circuit for induction heater« on: September 10, 2019, 05:23:45 PM »
First of all I'm sorry if I seemed rude, but it happens too often that people ask for something without having done their own research.
At first you should think about what you want. Do you want a working Induction Heather? Buy one from Ikea. Do you want a bit your DIY? Ebay-Kit. Do you want to dive into inductionheaters? Read something first and then decide. Do you want to make everything (PCB, soldering, ...) yourself? Start with a simple circuit and in the future worry about power. ... 16
Electronic Circuits / Re: I need a developed circuit for induction heater« on: September 10, 2019, 02:27:52 PM »17
Spark Gap Tesla Coils (SGTC) / Re: You would think this would be easy to find.« on: August 17, 2019, 09:44:07 PM »
My opinion is that you should start out simple and then improve/make your system more complex. This way you can learn a lot more than by building an UD-kit coil.
With the driver board do I have to have an interupter and is a interupter just for music and what is arc extenguishing feature. I know what arc extengusing is on spark gap, but on sstc what does it do. If you want to build a sstc (one resonant coil) you probably dont need an interrupter (most designs dont, but some do), with a drsstc (two resonant coils) you probably do need an interrupter. A use for an interrupter is the music functionality. Other uses of interrupters can be to limit heat production in sstcs. For drsstc you have to have an accurate interrupter, which can vary the ontime and not just the frequency. Arc extinguishing is probably the detection of groundstrikes and then an interrupter pulse, to kill the arc and prevent excessive current draw. The UD2.X doesn't have this feature and it works good enough. Would this be close to correct. Need power supply for the igbt, need the driver board to fire the igbt. What is the frequency limit of the UD2.5 driver board. Just trying to get a simple block diagram of sstc in my brain. This is going to be next prodject. So much info and bad info it really is making me pissed. Have a look at this diagramm from the book: DRSSTC BUILDING THE MODERN DAY TESLA COIL The diagram isnt perfect (like the feedback is commonly on the primary) but it should give you a good idea. btw I can recomend the book for further reading, also you might want to check out mads drsstc and sstc design guides, or loneoceans sstc II guide. 18
Solid State Tesla Coils (SSTC) / tesla coil varnish is dumb« on: July 14, 2019, 05:29:10 PM »
Dear High Voltage Forum!
Some time ago I started to wind a new coil. I chose a PU-dispersion paint, which turned out to be a mistake. My guess is that normal PU-paint would have worked, but the watersolvable-dispersion-stuff didn't. Now my coil has countless fingernail wide cracks. I don't think that is that big of an issue, as I have a layer of electricaltape underneath to make it structurally sound. But I'm still worried about the insulation aspect. That's why I'm asking for your thoughts on this. Does anybody think is should fix it? And what do you suggest? I can't reccomend this lacker. 19
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: Driving the LED lights with the streamers« on: July 08, 2019, 12:05:54 PM »
It is most likely part of the interrupter/driver curcuit, but the "stealing" could look cool too. Especially as the brightness will vary, depending on the fieldstrength.
It would be enough to have a few loops of wire soldered to either leg of the led. You will need to experiment how big the loops and how many turns light the led brightly, without killing it. 20
Solid State Tesla Coils (SSTC) / Re: SSTC interruptor not working« on: July 03, 2019, 09:10:32 PM »
I don't think that it was inrushcurrent. Did you calculate how much reactance your primarycurcuit has? And therefore how much current should flow?
If it worked with 30V before, my guess is that your primary reactance is too low. Btw: The dutycycle doesn't really matter in terms of limiting current, just the heat generation. |