[QUOTE=Chryseus;49646297][t]http://mynewsla.com/wp-content/uploads/2015/01/blowtorch.jpg[/t]
The solution to everything.[/QUOTE]
Last resort if you don't have atleast a toaster oven for reflow.
It amazes that between all the specialty irons and hot air guns that are on the market, the fastest way to remove corroded smd caps is needle nosed pliers and a rotational force. :v:
[QUOTE=MIPS;49648165]It amazes that between all the specialty irons and hot air guns that are on the market, the fastest way to remove corroded smd caps is needle nosed pliers and a rotational force. :v:[/QUOTE]
That can rip the pads off though.
[QUOTE=MIPS;49648165] a rotational force. :v:[/QUOTE]
That's called torque and please don't
FTDIgate 2.0 is happening over on the EEVblog forums.
[url=http://www.eevblog.com/forum/microcontrollers/ftdi-gate-2-0/msg856233/#msg856233]Dave's been blocked on FTDI's twitter[/url]
[editline]b[/editline]
[url=http://www.eevblog.com/forum/microcontrollers/ftdi-gate-2-0/msg856399/#msg856399]Heres a quick rundown[/url]
Someone needs to buy FTDI already, seems like that's what everybody else is doing.
[QUOTE=Cakebatyr;49651719]FTDIgate 2.0 is happening over on the EEVblog forums.
[url=http://www.eevblog.com/forum/microcontrollers/ftdi-gate-2-0/msg856233/#msg856233]Dave's been blocked on FTDI's twitter[/url]
[editline]b[/editline]
[url=http://www.eevblog.com/forum/microcontrollers/ftdi-gate-2-0/msg856399/#msg856399]Heres a quick rundown[/url][/QUOTE]
FTDI are just digging a deeper grave. Maybe while they're down that deep they'll remove that horrid bit of code from the driver.
I dunno why you'd use a FTDI chip in the first place, they're expensive compared to the CP2102 or CH340.
[QUOTE=Chryseus;49652204]I dunno why you'd use a FTDI chip in the first place, they're expensive compared to the CP2102 or CH340.[/QUOTE]
literally plug&play on windows.
But now people worry about counterfeits entering their parts supply line so much that going back to supplying a driver disk and using a different chip seems preferable.
I made a comparison of the three most common chips:
[img]http://i.imgur.com/tW6tGr2.png[/img]
Has anyone seen a power supply like this before?
[IMG]http://i.imgur.com/T985y1A.png[/IMG]
I hadn't but apparently you can actually get these from China. No magnetics, which is cool, but it's terrifying. What happens if that cap fails closed?
[QUOTE=r0b0tsquid;49653099]Has anyone seen a power supply like this before?
[img]http://i.imgur.com/T985y1A.png[/img]
I hadn't but apparently you can actually get these from China. No magnetics but it's terrifying. What happens if that cap fails closed?[/QUOTE]
It goes bang, it isn't unusual to see a supply like that in Chinese products that are enclosed, LED bulbs being the most notable, there isn't really any problem with it as long as there is no way to get your fingers on it.
The capacitor being a reactive component drops down the voltage with almost no power dissipation which is why it's so often used, magnetics are comparatively more expensive where only a small amount of current is required.
That power factor tho
[QUOTE=Falcqn;49657666]That power factor tho[/QUOTE]
Its a very messy simulation, and its the kind of products that if they supported greater loads than transformer based solutions, the power companies would have a hell of a time to keep up.
Got my new DMM yesterday. I like it. Haven't used it much yet, but I like it so far.
Calibrated the RC oscillator in an ATTiny85 with it, today.
[media]https://imgur.com/a/zj2sU[/media]
This guy does a nice series reviewing and testing multimeters, in this case the meter shown above:
[media]https://www.youtube.com/watch?v=zFvuigSS2Xk[/media]
[media]https://www.youtube.com/watch?v=F-VaE1Gn1Nw[/media]
So uh... Is this the place where I can ask about raspberry pi's?
I need some help, I'm looking for rgb led's that can work with it. I need a couple of led strips and a bendy matrix. No idea where to look or what to look for though, all I know is I need lights
[QUOTE=Recurracy;49659630]So uh... Is this the place where I can ask about raspberry pi's?
I need some help, I'm looking for rgb led's that can work with it. I need a couple of led strips and a bendy matrix. No idea where to look or what to look for though, all I know is I need lights[/QUOTE]
Yes! This is that place :)
You didn't say, but it sounds like you want addressable LEDs, i.e. individually controllable.
You want WS2812s or similar, see this eBay listing: [url=http://www.ebay.co.uk/itm/5V-WS2812B-5050-RGB-LED-Strip-30-60-144-Led-M-1M-4M-5M-Waterproof-/251947626070?var=&hash=item3aa93fae56:m:mOV4sT5049HrasxoczEDrig]here[/url]
Each WS2812 LED acts like a bit in a shift register, you just wire them up in a strip and send the colour data down the chain (or buy a prewired flex like that one).
There are lots of [url=https://learn.adafruit.com/neopixels-on-raspberry-pi/overview]guides[/url] on using WS2812s with a Raspberry Pi. They're often sold as "Neopixels", so it might help to search for that.
They're pretty power hungry though, keep that in mind. I wanted to use them for a daft punk Helmet, but it would have taken 10A of current to run the damn things :v:
How many LEDs were you planning on using exactly?
[editline]2nd February 2016[/editline]
My entire room's RGB strip lighting only takes 4A max.
A lot. A thoroughly retarded amount.
I mostly gave up on it because I couldn't get the parts 3D printed at the right scale, our vacu-forming machine was still AWOL, and I got busy with school.
I can't wait to use these drill bits on my boards!
[IMG]http://i.imgur.com/QcNmCNw.png[/IMG]
[QUOTE=Chryseus;49649584]That can rip the pads off though.[/QUOTE]
I know. Yes. That's why I never recommended this to anyone or tried this myself because logic states the pads will come off, especially if the leakage is really bad and delamination has started.
But I've tried everything now from heavy flux useage to specialty desoldering tools and hot air rework stations. None of it wanted to work reliably. Either pads got lifted or the caps simply exploded from the heat. For some weird reason though.....this is working the best so far. :v:
I guess I can keep trying this way until the failure rate climbs from it's current 0% after 25 capacitors.
I'm so clueless on digital circuit implementation. Say I wanted to generate 8 sine waves from a single micro. In my mind the way to do it would be to have 8 DACS and feed the data into each consecutively, switching on the appropriate DAC at the right time. But then I think that this would cause all the sine waves to be out of phase slightly with one another. Is that just the way it is? Does the micro just have to be substantially faster than the sampling rate of your data?
[QUOTE=No_Excuses;49670851]I'm so clueless on digital circuit implementation. Say I wanted to generate 8 sine waves from a single micro. In my mind the way to do it would be to have 8 DACS and feed the data into each consecutively, switching on the appropriate DAC at the right time. But then I think that this would cause all the sine waves to be out of phase slightly with one another. Is that just the way it is? Does the micro just have to be substantially faster than the sampling rate of your data?[/QUOTE]
Using a DDS chip would be preferable since it contains its own lookup table to generate a sine wave so you don't need to feed it the actual data just things like the frequency, phase offset, etc, as long as they have a shared clock they will be pretty much exactly matched.
Look at the design for a DDS if you want to try doing your own.
[url]http://www.analog.com/media/en/technical-documentation/data-sheets/AD9850.pdf[/url]
Popular amongst the Arduino community, I believe.
:snip:
no way for me to snip the inane amount of personal info (mostly for other people) :c
I built my QRP-Labs GPS receiver, drilled out holes for the SMA bulkhead connector and the GX16-9 circular connector that I'll wire to a DB9... Then realized my SMA bulkhead connector was an RP.SMA connector!
I need another adapter! :(
[t]http://i.imgur.com/Y5f7dtR.jpg[/t]
I got some thermochromic sheet 30-35c to see how good it is for tracking down shorts / partial shorts, it seems to work pretty well, I put a 1/4W resistor under it and put 15V across it so it dissipates 225mW and sure enough it showed up quite clearly, only minor usage issue is you can't put a large sheet on a board that isn't very level but you could cut it in to smaller squares and put it in suspect areas, it's usefulness is seeing what heats up quickest since that's your most likely suspect, you can also get it in powder form but that seems to have a sharp transition temperature rather than a range.
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Electrical Engineering V3
