Raspberry Pi Forums

davidcoton

OTOH, I've just set up a Ryzen Threadripper 3960X 24-Core 3.9GHz, which is fairly much cutting edge. A cutting edge GPU is 5-6 times more productive. I'm also impressed, for example, even with the first generation Threadripper CPUs such as the 12-core 1920X. Are you running Linux or a Microsoft ope...

davidcoton

A Pi will not drive a 4Ω speaker directly. So you need an amplifier (at least, possibly an alternative DAC as well). The power rating of the amplifier specifies its maximum output. The speaker power rating specifies its maximum input. So as long as the speaker can cope with all that the amp can prod...

davidcoton

I can use my Raspberry Pi with Raspbian Buster to monitor Folding@home on my Windows 10 computer. Would it be possible to run Folding at Home using x86 emulation on a Pi? Is qemu the obvious choice? Has anyone tried this? How's the performance? It would be interesting to try, but I suspect fairly p...

davidcoton

Heater wrote: ↑
Mon May 18, 2020 11:38 am
... unless I was suitably enclosed.

While that may be appropriate, particularly in present conditions, I'm not entirely certain that it's what you meant to say.

davidcoton

Thanks! Contact details entered.

davidcoton

Please! Especially the A+ which is a gap in my collection. (UK but I hope we are still EU this year for this purpose!)

davidcoton

Plastic standoffs should be more than adequate unless you have extreme vibrations or mechanics shocks. They are widely used commercially.

davidcoton

ejolson wrote: ↑
Sat May 16, 2020 1:46 am
a broken monitor seems like a small loss

Does that make your monitor the first non-human COVID-19 victim in your area?

davidcoton

I'm hoping some kind Doctor will leave a Police Box in my front garden. Room for all my Pis and much other junk too.

davidcoton

Hi Emma! I'm a cautious bugger, and am willing to spend $ in the name of safety or robustness. Would there be no advantage at all to using the dc-dc converters to bring things close to what the relay and pumps expect, or is it just plain old wasteful? I do indeed have several things plugged in, hum...

davidcoton

For a project on a similar subject, that uses both CPUs (but not ARM) and GPUs, see Folding at Home . Incidentally this may be a more powerful DC project than any single supercomputer -- its actual power is difficult to determine as there are problems counting active hardware when some of it runs on...

davidcoton

can some one conferm that this part " https://www.mouser.co.uk/ProductDetail/Littelfuse/LPWI252010B2R2T?qs=sGAEpiMZZMsg%252By3WlYCkU%2FaHyUAoFbPOhgBlHL6h73I= " will work to replace L5 ? I can confirm that the spec appears correct, as far as it matches the info on the schematic. Will it work? That d...

davidcoton

Heater wrote: ↑
Wed May 13, 2020 8:37 am
I think we should prepare a ready made post with all the usual replies to this endlessly recurring question.

I think that is what @klricks did in the first reply

davidcoton

Cyprus125 wrote: ↑
Wed May 13, 2020 12:55 am
any idea how much power can a Pi put out it's GPIO. cause if it's under 5W there is no restrictions on transmitting in the FM band.

Caution to others reading this: Laws in other areas (specifically UK and Europe) may not permit 5W FM transmitters.

davidcoton

I also wanted just numbers and found a way that does not require any programming at all. A few lines in config.txt with buttons connected to GPIO pins. All the Raspbian programs tried, including VLC video player, work a though a real keyboard is attached but no coding at all: dtoverlay=gpio-key,gpi...

davidcoton

Botspot wrote: ↑
Tue May 12, 2020 7:11 pm
Since those damaged parts are right next to the usb power port, is there any chance that powering the Pi from the 5v GPIO pon would bypass that?

No.

davidcoton

sudo apt-get update && sudo apt-get dist-upgrade @topguy has described the main problem. Note also that the recommended update/upgrade procedure is: sudo apt update sudo apt full-upgrade The differences are subtle but real. "apt" is better suited to interactive use than "apt-get", "full-upgrade" is...

davidcoton

Yes I saw the 4.4A, although I didn't put too much emphasis on that. Is that a max current spec that has something to do with the saturation of the ferrite? 4.4 A seems quite a bit though... if it's powering the ram only then how can it expect a current of more than 1A? At 1.1v that would mean over...

davidcoton

Well - I 'borrowed' the card out of my camera and installed Buster and after a few attempts, it came back to life. Looks like I'm ordering a new SD card today... I've tried to read the card in several other devices and none of them can see it so it looks like I'm starting from scratch. In the absen...

davidcoton

Something is definitely not well, even if not quite dead. I can think of three possibilities: The power strip (or one outlet on it) The power supply (or the connected cable) The Pi OR, if you are really unlucky, some combination of the above (which gives another four possibilities, plus the variants...

davidcoton

Please add me to the list of people who want a Pi 4 with 16 GB. Browser tabs, caches, temp directories in tmpfs, PDF viewer, IDE, compiling in the background plus sometimes having to use Firefox and Chromium simultaneously....I'm now at the point where even with 4 GB everything crashes twice a day ...

davidcoton

Isn't a 555 a timer? Wouldn't a comparator (or op-amp wired as such) be easier? Try LM324 or many others, but not 555. :roll: :lol: Can be. A 555 is only a timer when you put it in a suitable circuit with capacitor, resistor and perhaps feedback. A 555 is very versatile. It contains: 1) A comparato...

davidcoton

Heater wrote: ↑
Wed May 06, 2020 4:48 am

So what this poor mans power supply needs is a 10 cent 555 chip,

Isn't a 555 a timer? Wouldn't a comparator (or op-amp wired as such) be easier? Try LM324 or many others, but not 555.

davidcoton

I wouldn't buy from the ebay seller you quote. Doesn't know the difference between halogen and LED.

davidcoton

...The key to brilliant engineering is to use the cheapest method, and produce a result that cannot be improved by the other approach... FTFY Maybe. It depends on the constraints for the current project. Some projects are more time-critical than cost-critical. Quality/reliability may also be a fact...

Search found 5008 matches

Re: Get your Pi to fight COVID-19

Re: 160 Watt 4 ohm speaker with pi zero

Re: Get your Pi to fight COVID-19

Re: Raspberry Pi 4 no boot: Extreme (too hot to touch) heat on microsd card reader [SOLVED]

Re: [EU/US] Giveaway 1 x RPI A, 1 x RPI A+, RPI Zero

Re: [EU/US] Giveaway 1 x RPI A, 1 x RPI A+, RPI Zero

Re: Standoffs - plastic or brass?

Re: Get your Pi to fight COVID-19

Re: What do you guys store your pi boards in when not in use?

Re: One power plug to rule them all?

Re: Get your Pi to fight COVID-19

Re: broke a component :(

Re: Running Regular Application with Raspberry Pi Clusters

Re: FM Transmitter for Kodi?

Re: keypad connection

Re: More a Hardware Problem

Re: Can't update anything or download

Re: Rpi4: need help identifying power components

Re: Suddenly stopped working

Re: Pi4 No Longer Boots

Re: Resoldering Ram on Rpi4?

Re: Poor Man's Pi Power Supply Tester

Re: Poor Man's Pi Power Supply Tester

Re: Poor Man's Pi Power Supply Tester

Re: LEDs and resistors