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by Buggington
Sat Dec 14, 2013 10:33 pm
Forum: Graphics, sound and multimedia
Topic: Beat detection for 3.5mm jack
Replies: 8
Views: 6478

Beat detection for 3.5mm jack

Hi all, I've currently got a Pi setup with Shairport and hooked up to my speakers. I would like to be able to hook some LEDs up to the GPIO pins so that they flash with the beat of the music that's being played through the 3.5mm jack. I've been looking for some beat detection software that can do th...
by Buggington
Fri Jan 18, 2013 11:50 pm
Forum: Media centres
Topic: Raspberry Pi Spectrum Analyser
Replies: 10
Views: 7608

Re: Raspberry Pi Spectrum Analyser

t is a good idea to use any voltage inverter such as the MAX1720 previously mentioned or the something like the good old ICL7660. But also you could think to use some rail to rail I/O opamps, such LMC6482, MAXIM's MCP6001, LMC7101 to list some. The sequent filter/rectifier should be ac coupled (the...
by Buggington
Fri Jan 18, 2013 11:34 pm
Forum: Media centres
Topic: Raspberry Pi Spectrum Analyser
Replies: 10
Views: 7608

Re: Raspberry Pi Spectrum Analyser

Texy (apparently I can only embed three quotes, so I'm starting afresh): You're right, the FFT option does sound good. I'm using a PICAXE 18M2; I didn't code it, but used a flow chart, which I'll post when I'm next at my desk. I didn't know the PICAXEs could do the offset voltage thing, but that wou...
by Buggington
Sun Jan 13, 2013 7:56 pm
Forum: Media centres
Topic: Raspberry Pi Spectrum Analyser
Replies: 10
Views: 7608

Re: Raspberry Pi Spectrum Analyser

How would that work? Are you suggesting that I could run the op-amp off 5V and 0V? Otherwise I don't really understand what you mean by a half rail point, sorry :( OK Run the op-amp off 5v and 0v. Connect two resistors, as a potential devider from 5v to 0v, so that the junction will be at 2v5. Conn...
by Buggington
Sun Jan 13, 2013 5:29 pm
Forum: Media centres
Topic: Raspberry Pi Spectrum Analyser
Replies: 10
Views: 7608

Re: Raspberry Pi Spectrum Analyser

Don't know about the rest, but in option 1: Cons Very large circuit Amplifiers require a -5V supply, which the Pi can't supply Where on your circuit you have the +inputs to the opamps connected to ground, could you not create a half-rail point using a couple of 10k resistors (and capacitor)? As lon...
by Buggington
Sun Jan 13, 2013 10:18 am
Forum: Media centres
Topic: Raspberry Pi Spectrum Analyser
Replies: 10
Views: 7608

Raspberry Pi Spectrum Analyser

Hi :) In my A Level Electronics class I have created an LED Audio Spectrum Analyser, where you plug your iPod (or other generic MP3 player) into the 3.5mm jack, and as you play the music it lights up five lines of LEDs in the traditional way. Image below :) http://i1002.photobucket.com/albums/af145/...
by Buggington
Mon Aug 13, 2012 12:40 pm
Forum: General discussion
Topic: Case with fan
Replies: 18
Views: 7467

Re: Case with fan

cashaw wrote:It's temperature is always around 60-70 degrees and has been running perfectly happy for 2+ years without issues.
Hmmm... That's starting to change my mind a little.
by Buggington
Mon Aug 13, 2012 12:32 pm
Forum: General discussion
Topic: Case with fan
Replies: 18
Views: 7467

Re: Case with fan

How do you guys know the temperature then?
by Buggington
Mon Aug 13, 2012 12:25 pm
Forum: General discussion
Topic: Case with fan
Replies: 18
Views: 7467

Re: Case with fan

True, thanks for all the input. I'm going to continue anyway, partly because it would be quite a cool thing to have sat on my desk. I had no idea that they would be able to run up to that temperature - my logic was if an nVidia graphics card couldn't handle 130 degrees then a £30 computer certainly ...
by Buggington
Mon Aug 13, 2012 9:57 am
Forum: General discussion
Topic: Case with fan
Replies: 18
Views: 7467

Re: Case with fan

Zulucat: I've been having a look at some of the fans on the Mouser site and this seems to fit the bill http://uk.mouser.com/ProductDetail/ADDA/AD4505MX-G70-LF/?qs=sGAEpiMZZMvuXzJ9NcThaqBG%2fSi4pPVaariIjxUmypo%3d Also, do you think these heatsinks would fit in that case? They're 10mm high apparently....
by Buggington
Sun Aug 12, 2012 8:20 pm
Forum: General discussion
Topic: Case with fan
Replies: 18
Views: 7467

Re: Case with fan

Cool, thanks. I've had to solder quite a few wires before, so shouldn't be a problem. I shall google for a wiring diagram. Thanks for the help :D
by Buggington
Sun Aug 12, 2012 6:01 pm
Forum: General discussion
Topic: Case with fan
Replies: 18
Views: 7467

Re: Case with fan

That looks like exactly what I'm looking for - thanks! Unfortunately, it seems to be in the wrong country- I'm in the UK!

Any idea how I would connect to the GPIOs? It's an entirely new thing for me :oops:
by Buggington
Sun Aug 12, 2012 1:48 pm
Forum: General discussion
Topic: Case with fan
Replies: 18
Views: 7467

Re: Case with fan

You're right, I don't need to do it, but it would mean it'll last longer. I might be wrong here but it strikes me that a phone's chipset wouldn't be running at 60% usage the whole time (mine certainly doesn't). I've been planning on getting the heatsinks below - obviously these are the first step to...
by Buggington
Sat Aug 11, 2012 9:02 pm
Forum: General discussion
Topic: Case with fan
Replies: 18
Views: 7467

Case with fan

Hello :) Having installed RaspBMC on my Pi I've noticed it's getting particularly hot (constantly using around 60-100% CPU) when it's been on for a while, so much so that I can feel it through the plastic case. I want to find a case where I can mount a small CPU fan on top, but I haven't really seen...

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