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by Burngate
Sun May 20, 2018 8:34 am
Forum: Off topic discussion
Topic: Pi Towers at Maker Faire?
Replies: 3
Views: 992

Re: Pi Towers at Maker Faire?

Apparently they had mini-bowls at the reception. Don't know if Sunningdale Bowling club was involved.
by Burngate
Sat May 19, 2018 5:36 pm
Forum: Troubleshooting
Topic: Noise from the board
Replies: 12
Views: 328

Re: Noise from the board

What did you do in your youth? Dougie's 55 & can't hear it; mahjongg's 62 & also can't hear it; I'm 69 and can! Between 18 & 25 I subjected my ears to heavy metal concerts - Stones, Iron Maiden, Cream, Joe Cocker, ... - and as a result I suffer from mild tinnitus. Maybe that whine is beating with th...
by Burngate
Fri May 18, 2018 5:48 pm
Forum: Other projects
Topic: Infrared Bird Box project resistors
Replies: 4
Views: 121

Re: Infrared Bird Box project resistors

Nice article. Thanks, bensimmo. Odd musings ... ... In the good old days, when electronics glowed , the valve filaments, at least the E ones such as ECC83, were 6.3v, which isn't in any E-series (P valves had their filaments in series and needed a current of 300mA, also not in any E-series below E24...
by Burngate
Fri May 18, 2018 9:11 am
Forum: Other projects
Topic: Infrared Bird Box project resistors
Replies: 4
Views: 121

Re: Infrared Bird Box project resistors

I find it slightly annoying that on the "What you will need" page it says "some" resistors and "some" LEDs. How many is "some"? Two? Twenty? Four thousand eight hundred and twenty seven? As for the resistors, they're being used to control the current through the LEDs. Almost certainly the LED won't ...
by Burngate
Thu May 17, 2018 5:39 pm
Forum: Troubleshooting
Topic: All pins fried, don't know why
Replies: 24
Views: 538

Re: All pins fried, don't know why

... I am not convinced that is the case No serial lines (USART) normally use push-pull drivers (actively driven high and low). I think you mean I2C lines, as they indeed use open-collector outputs. Or perhaps you are thinking about a bus-based serial line with drivers that can tri-state (RS485). Yo...
by Burngate
Thu May 17, 2018 9:18 am
Forum: Troubleshooting
Topic: All pins fried, don't know why
Replies: 24
Views: 538

Re: All pins fried, don't know why

IGNORE THIS POST! The serial protocol requires the lines to be driven by an open-collector output - high is open-circuit, low is pull-down to gnd. At one end of the line (probably the rx end) there should be a pull-up resistor. The Pi emulates this by changing between input (high impedance) for high...
by Burngate
Thu May 17, 2018 8:42 am
Forum: Beginners
Topic: Impossible to buy a rasberry... ?
Replies: 2
Views: 147

Re: Impossible to buy a rasberry... ?

Which country are you in?

I'm in the UK, so your experience could be different, but when I click on the "Buy Now" I'm presented with several possibilities; clicking on one of those takes me to a shop where I can buy lots of stuff!
by Burngate
Wed May 16, 2018 10:46 am
Forum: Troubleshooting
Topic: USB voltage slowly dropping
Replies: 16
Views: 432

Re: USB voltage slowly dropping

... I am not using a device that can translate this on the fly, but it looks like the current is adjustable? https://docs-emea.rs-online.com/webdocs/138c/0900766b8138cf36.pdf Meanwell IRM-20-5 No direct experience, but it seems from its spec it should work. Can't remember the details, but the USB 5...
by Burngate
Wed May 16, 2018 9:21 am
Forum: General discussion
Topic: RPi 3 crashed
Replies: 10
Views: 623

Re: RPi 3 crashed

Is it a BGA package? It looks to me as if all the connections are at the edges ... I'm not going to do more than look at it, though. If "smashing" is the way forward, perhaps some precision could be attained using an automatic centre punch. It's worked for me in the past. Side note: some of the pict...
by Burngate
Tue May 15, 2018 4:56 pm
Forum: Troubleshooting
Topic: Power problem
Replies: 6
Views: 183

Re: Power problem

That statement doesn't make sense. Current always goes in circles. If there's no route back into the Pi, the current won't leave the Pi. The circuit on your breadboard is using the Pi's 3v3 for power? So current will come from the Pi's 3v3 pin, go through the breadboard, and back into the Pi's groun...
by Burngate
Tue May 15, 2018 10:56 am
Forum: Troubleshooting
Topic: Pin 1 and Pin 2 short circuited
Replies: 9
Views: 275

Re: Pin 1 and Pin 2 short circuited

For an electronic device, the definition of "dead" used to be the loss of the magic smoke installed when it was manufactured. However, because of health concerns for users, as well as the chronosynclastic issues that some researchers have raised about too much magic smoke in the atmosphere, many mod...
by Burngate
Tue May 15, 2018 10:17 am
Forum: Beginners
Topic: Powering Pi3B+ with UBEC
Replies: 3
Views: 153

Re: Powering Pi3B+ with UBEC

Possibly.
It will depend on whether the monitor's supply can handle the extra load. you're asking it to give an extra 1½A on top of what the monitor requires.

If I were to design a power supply for a monitor, I wouldn't have allowed for that, but I didn't design that one, so you never know!
by Burngate
Tue May 15, 2018 9:53 am
Forum: Beginners
Topic: LED Strip colouring in reverse with PiGPIO
Replies: 18
Views: 377

Re: LED Strip colouring in reverse with PiGPIO

Yeah, you're right - it's not a MOSFET! It's a regulator, and the bottom line says -3.3, so it's a 3v3 version FETs come in many flavours, the major divisions being N-channel (for which the gate has to be positive compared to the source for it to conduct) and P-channel (gate negative, you don't want...
by Burngate
Tue May 15, 2018 9:22 am
Forum: General discussion
Topic: RPi 3 crashed
Replies: 10
Views: 623

Re: RPi 3 crashed

That doesn't sound promising.
That chip is the WiFi & BlueTooth interface. I've no information about it (others might) but my guess is that it's pulling its power rail down.

If someone came to me asking me if I could fix it for real money, I'd advise them to bin it and buy a new Pi. Sorry.
by Burngate
Mon May 14, 2018 5:35 pm
Forum: General discussion
Topic: RPi 3 crashed
Replies: 10
Views: 623

Re: RPi 3 crashed

Here's a crop from the PDF: Q6 ACT LED.png Part number DMG1012T Available from ... well, actually CPC didn't have it, and Mouser were off-line, but I'm sure you could get one in any number of places but ... are you sure the Pi won't boot? Sure the green LED won't flash, but that shouldn't stop it wo...
by Burngate
Mon May 14, 2018 9:59 am
Forum: Beginners
Topic: Using salvaged speakers
Replies: 4
Views: 153

Re: Using salvaged speakers

A speaker is generally characterised by its impedance - 4 or 8Ω is normal - and the maximum power it can handle - 5W is not bad for a small one from a domestic appliance, though you could find stage speakers that can handle hundreds of Watts. The Pi's jack cannot give out much power. Technically, it...
by Burngate
Mon May 14, 2018 8:26 am
Forum: Beginners
Topic: LED Strip colouring in reverse with PiGPIO
Replies: 18
Views: 377

Re: LED Strip colouring in reverse with PiGPIO

Reynastus wrote:
Sun May 13, 2018 10:10 am
... to the middle pin of a MOSFET (LM3940IT to be exact) ...
I was slightly bemused by that - I can't find a FET with that number. The only device numbered LM3940 is a low-drop-out regulator.
Could you confirm that number?
by Burngate
Fri May 11, 2018 8:45 am
Forum: Beginners
Topic: Keyboard config
Replies: 6
Views: 182

Re: Keyboard config

Get a second card, put Raspbian on it, and boot the Pi with it.
Using a usb card reader, edit the appropriate file on the original card.
by Burngate
Thu May 10, 2018 11:04 am
Forum: General discussion
Topic: Raspberry Pi audio HAT with XLR +48v
Replies: 5
Views: 205

Re: Raspberry Pi audio HAT with XLR +48v

Also, your link appears screwed up. It should be https://www.blackboxefx.com/
by Burngate
Thu May 10, 2018 10:54 am
Forum: Troubleshooting
Topic: Pi still has some power after removing power cable
Replies: 8
Views: 254

Re: Pi still has some power after removing power cable

PiGraham wrote:
Thu May 10, 2018 7:45 am
3B and 3B+ are presumably both new enough to count as "later Pi"
Original B: BAT54
B+: AP2331
2B, 3B, 3B+: RT9741
by Burngate
Thu May 10, 2018 10:35 am
Forum: General discussion
Topic: A very modest feature suggestion...
Replies: 8
Views: 487

Re: A very modest feature suggestion...

Question ... Does writing with a marker pen on the bottom of a board constitute a modification that would invalidate the guarantee? If not, doing that means not only is it visible from the bottom, but it can be printed big enough to read without a magnifying glass (that's the other thing you lose wi...
by Burngate
Wed May 09, 2018 9:24 am
Forum: B+ addons
Topic: PI3B+ not work when powered by GPIO pins
Replies: 4
Views: 255

Re: PI3B+ not work when powered by GPIO pins

Just a thought ... ... There are a few differences between the 3B and 3B+, which shouldn't affect most users but may catch some out. Having enlightened us as to what you're attaching to your Pi, as well as using the GPIO header are you also using the 2-pin RUN header? Because, on the 3B the two pins...
by Burngate
Tue May 08, 2018 5:19 pm
Forum: B+ addons
Topic: PI3B+ not work when powered by GPIO pins
Replies: 4
Views: 255

Re: PI3B+ not work when powered by GPIO pins

Nothing regarding the GPIO header has changed between 3B and 3B+, so what worked on the 3B should also work on the 3B+. And the red LED is on, so power is ok. Have you updated the SD card before putting it in the 3B+? I assume so, since you say it works if power is applied through the USB port. Is t...
by Burngate
Tue May 08, 2018 11:04 am
Forum: Graphics, sound and multimedia
Topic: recording 4 microphones at the same time
Replies: 9
Views: 406

Re: recording 4 microphones at the same time

To be able to help, I'd want to know more about the mics - make, model. Knowing they're small and have two connections isn't enough - though we could make some assumptions. Maybe they're moving-coil? They're unlikely to be condenser, since those are likely to be expensive. mic to wire, wire to audio...
by Burngate
Sat May 05, 2018 5:27 pm
Forum: Python
Topic: When if block is ending
Replies: 9
Views: 316

Re: When if block is ending

Check its eggs aren't golden? ... oh, that's only for geese ...
And chicken on its own is rather dry, so maybe look for some chips ... in fact why not get some plaice, and leave the chicken for another day ...

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