Adding copper fills and stitching hundreds of vias to ground is always the most satisfying step in PCB routing. "Never trust a copper fill's opinion unless it's well grounded," #electronics
Notices by niconiconi (niconiconi@cybre.space), page 2
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niconiconi (niconiconi@cybre.space)'s status on Sunday, 12-Sep-2021 22:45:25 CEST niconiconi -
niconiconi (niconiconi@cybre.space)'s status on Sunday, 12-Sep-2021 22:45:25 CEST niconiconi Rearranged components, looks better now. #electronics
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niconiconi (niconiconi@cybre.space)'s status on Sunday, 12-Sep-2021 22:45:24 CEST niconiconi Before sending this circuit board to the factory, I have to add the most important thing: Let's all love Lain! #electronics #lain
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niconiconi (niconiconi@cybre.space)'s status on Sunday, 12-Sep-2021 22:45:23 CEST niconiconi Low-noise DCDC converter is a success. 🎉 The buck converter's output noise is 8.2 mV peak to peak, and noise after the post filter is less than 1 mV, undetectable on this oscilloscope, it's under the noise floor.
I even appear to "beat" the published results by National/TI by not having any switching spikes. Though, I don't think it's because my layout is better, more likely my SMA test ports with full 50-ohm signal paths simply have less measurement artifacts than the banana plugs on the official reference design. #electronics
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niconiconi (niconiconi@cybre.space)'s status on Sunday, 12-Sep-2021 22:45:23 CEST niconiconi My circuit board arrived. I found a stupid bug immediately: the 3.3 V power supply could not turn on - there was no ENABLE signal whatsoever, but the pull-up resistor for ENABLE is right there, why?
Then I noticed the ENABLE signal is pulled up to... 3.3 V. :blobfacepalm: 🤣 #electronics
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niconiconi (niconiconi@cybre.space)'s status on Wednesday, 01-Sep-2021 16:17:04 CEST niconiconi - Click "Download PDF"- IEEE: Pay $30 first!- Open the paper via Sci-Hub- "This paper is U.S. Government work, not protected by U.S. copyright."
#TIL Fun fact: some papers on Sci-Hub is 100% legal.
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niconiconi (niconiconi@cybre.space)'s status on Tuesday, 31-Aug-2021 16:45:07 CEST niconiconi Q: Why can't the UK just cancel Brexit?
A: The instruction "br exit" is an unconditional jump.
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niconiconi (niconiconi@cybre.space)'s status on Sunday, 22-Aug-2021 00:01:10 CEST niconiconi The SFP+ power supply specification is the most convoluted standard I've seen so far. First, your power supply, preferably, should use a reference LC filter. Then you take a measurement at the output side the PSU. Finally you import the data to your computer and divide the results by the transfer function H(f) of that LC filter to deembed that filter and reconstruct the noise voltage before the reference filter.
WTF? (What The Filter?) #electronics
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niconiconi (niconiconi@cybre.space)'s status on Saturday, 21-Aug-2021 12:27:43 CEST niconiconi "Dog Bone" layout 🤣 #electronics
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niconiconi (niconiconi@cybre.space)'s status on Sunday, 15-Aug-2021 16:05:04 CEST niconiconi > Some fab equipment makers are finding it difficult to get FPGA chips needed to make their equipment.
http://www.thelec.net/news/articleView.html?idxno=3179
The chip shortage is going full circle now. #electronics
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niconiconi (niconiconi@cybre.space)'s status on Sunday, 15-Aug-2021 14:46:24 CEST niconiconi I got 4 followers on #NeoCities (I didn't even know you could follow people there), I'd call it a win.
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niconiconi (niconiconi@cybre.space)'s status on Thursday, 12-Aug-2021 08:41:21 CEST niconiconi > I can do all of my programming and system admin work with an iPad Pro because I work on remote servers over ssh
I see, so the iPad Pro is not really more powerful than a TRS-80 Model 100 for this purpose. :doge:
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niconiconi (niconiconi@cybre.space)'s status on Monday, 09-Aug-2021 20:38:42 CEST niconiconi /me starts hunting for another forbidden USB ASIC you cannot buy - Norelsys NS1021. This chip can transparently convert the USB 2.0 electrical signals to a true AC-balanced form for transmission over CAT-6 or coax cable, with capacitor or transformer isolation.
Not sure if I can use it. There's nothing you can't get from Shenzhen with enough persistence, but getting a leaked datasheet is more difficult...
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niconiconi (niconiconi@cybre.space)'s status on Thursday, 29-Jul-2021 20:19:52 CEST niconiconi Found vintage #Tektronix sampling oscilloscope online with 20 GHz sampling + TDR modules installed at a great price. 🤓 But the screen in the photo actually displays a self-test failure :oh_no: Can either be a module fault (replaceable) or a mainframe fault (can be impossible to fix), let's see if I can convince the seller to do some tests... #electronics
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niconiconi (niconiconi@cybre.space)'s status on Thursday, 29-Jul-2021 20:19:51 CEST niconiconi Sent a message to the seller. I was told the machine was already sold since a long time ago :blobshrug:
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niconiconi (niconiconi@cybre.space)'s status on Thursday, 29-Jul-2021 20:19:50 CEST niconiconi Continue my hunt of old test equipment above 1 GHz. Last week I ordered a similar Tektronix sampling oscilloscope from another seller, but it's still not shipped yet. I'm not sure whether the vendor wants to sell it at this point... :blobshrug: Finding a cheap one is the exception rather than the rule (*), but I'll continue searching for them... #electronics
(*) unless you live in the Silicon Valley or near the MIT, both locations have the biggest electronic flea markets in the U.S., you can find a lot of unusual equipment there...
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niconiconi (niconiconi@cybre.space)'s status on Thursday, 29-Jul-2021 20:19:48 CEST niconiconi Ha, the scope seller said they are on a business trip and will take a look of the scope for me later. Good news. #electronics
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niconiconi (niconiconi@cybre.space)'s status on Thursday, 29-Jul-2021 20:19:47 CEST niconiconi Found another #Tektronix 11801 mainframe. I hope I get better luck this time. #electronics
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niconiconi (niconiconi@cybre.space)'s status on Thursday, 29-Jul-2021 20:19:47 CEST niconiconi Sad ending. The vendor said the oscilloscope I wanted was listed online for a long time without any buyer, so it has already been completely dismantled by the company for parts. :oh_no: RIP, scope. Tektronix CSA803 & 11801 were the best engineered sampling oscilloscopes from the early 1990s. #electronics
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niconiconi (niconiconi@cybre.space)'s status on Thursday, 29-Jul-2021 20:19:46 CEST niconiconi Too bad that a vintage 20 GHz oscilloscope is still unable to do any USB 3.0 testing because there's no clock recovery, and you CANNOT trigger the scope from an external clock either because USB uses spread spectrum clock. The best thing it can do is TDR, which should be good enough, but still leaves a lot to be desired. The brutal reality of high-speed digital systems - $30,000 test equipment needed to verify a $10 disposable computer gadget. #electronics #usb