yes the audio works fine when i place headphones to the raspberry pi jack, after short loading period sounds good. but when i change there input going to the 2W future kit amplifier to the jack no more sound. this kind of 2W amp has been very good in other projects.....now i just don't know what does the rasberry would like to have as an amplifier.....alphanumeric wrote:I'd plug a set of headphones in and make sure the jack is still outputting audio first.
The raspberry pi sound works fine when i place headphones to the output phones jack, that's why it seems like unnecessary to change the setting (also it's beyond my know-how with this tool)......the problem is i think to find an amplifier that would works with the raspberry pi and play the instrument sound through its speakers. Could the problem be that 2W is too low power for the job? what would be better?fruitoftheloom wrote:https://www.raspberrypi.org/documentati ... -config.md
yes. when i replaced the 2 W amplifier for the first time i tried it with cd-player and there it worked fine....there i got the thought that there is something in this two machines that stops them working together. Although when i replaced new future kit 2 W amp to the Raspberry output jack it worked fine maybe 10 times and now stops working again completely...alphanumeric wrote:Does that amplifier work if you plug it into another device, like a PC or MP3 player?
in the amplifier i have a speaker that is bigger than 0.25Watt.....i wonder if this is causing the problem.....the instruction sheet shows 0.25 Watt speaker used for this kind of amplifieralphanumeric wrote:I can't think of a reason why that would happen? If there is no mechanical fault the audio source must be switching to HDMI on the Pi or something?
amplifier is actually powered by 12V/ 2A cord.Burngate wrote:The Pi doesn't care what gets plugged into its A-V socket - it doesn't sense it, it just outputs the audio (and the video) at a more-or-less standard level, on the assumption that something can use it, be that a pair of ear-buds, a small or large amplifier, or the whole of the PA system at Reading.
Similarly, the amplifier doesn't care what's plugged into it - anything injected into its input will come out of its output, as long as it's somewhere in the audio band.
Your system worked to begin with, so you're not too far wrong.
You say, in your third post, you tried a new amp, and that also worked for a short while before stopping.
The amp (both of them?) still works with another source, so you haven't properly broken it, and the Pi still puts out audio through headphones, so that's alright.
Which "Future Kit 2W amplifier" are you using? - they seem to make more than one, with varying amounts of data on them.
About the only thing wrong with them is the polarised capacitor on the input, which shouldn't cause problems, though I'd put a non-polarised one there, myself.
And how are you powering it?
the speaker that i now have there should be 8ohm,it was measured ( but it's more than 0.25W quite a lot more...)Burngate wrote:Future Kit don't provide enough information - though more than many places do.
Still, from what I can see, it's a mono amplifier, with one input and ground.
Earphones are generally stereo, with two inputs and ground, and the Pi gives out stereo, again two outputs and ground.
It's not easy to see from your photo, but could it be that you haven't correctly mixed left and right into the amp?
The only pdf I could find said 2W, using a 12v supply and 8Ω speaker
Its figure of 0.25W is in their spec for current consumption - in other words, if you want 0.25W and you use an 8Ω speaker, it'll take 300mA
Having a speaker rated at greater than 2W won't be a problem. It just means you won't break the speaker even at full volume.
The impedence of the speaker is more important - They talk about 8Ω, but don't say whether 4Ω would be ok.
They also don't say what the chip is, so we can't go and look at its spec.
But if it couldn't handle a 4Ω load with a 12v supply, then the chip would die.
If the chip hasn't died with the speaker and supply you've got, then everything's hunky-dory.
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