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What can I try to filter it?
No, noise is still present without the microcontroller.could it be the "seeduinio"?
I've already checked if the power supply is responsible, so I guess you mean the bit about short connections and ground.Probably follow Harald's advice.
Right, this is what I feared. Oh well, suppose step free volume control isn't so bad...If the hum is a pure sinewave with no harmonics (but it probably has harmonics) then a filter for that frequency will cut some parts in music and in speech. But with harmonics then you must cut all bass frequencies which is bad for music and makes male adult voices sound like chipmunks.
My sound systems and many I made over the years produced no hum.
I'll try this when I get somewhere it's possible to buy components...something in the range of 7uH to 33uH
That's just the thing, it will be doing both. Headphones and amp -> larger speakers. I tried reading up on this, but didn't get too far, should I get less, such as 1K?10K should be sufficient, assuming you're going into some kind of amp
Oh yeah, there is provision for flash memory playback, and the ""pro"" version has like 128mb of it. Not sure if that means the one I have doesn't have flash, or if it does because neither of the other playback sources - some of which I have - are documented. You have SD, USB (referenced as "u-disk"...), aux (?), sleep (??) playback too. How do you accessAnd yeah ... I looked at the application list for that module ... Strange that is has removable storage, yet they recommend it for applications similar to a talking greeting card.
That's about where I would be parked on the issue too.I'll try this when I get somewhere it's possible to buy components...
That's just the thing, it will be doing both. Headphones and amp -> larger speakers. I tried reading up on this, but didn't get too far, should I get less, such as 1K?
Oh yeah, there is provision for flash memory playback, and the ""pro"" version has like 128mb of it. Not sure if that means the one I have doesn't have flash, or if it does because neither of the other playback sources - some of which I have - are documented. You have SD, USB (referenced as "u-disk"...), aux (?), sleep (??) playback too. How do you access
While we're on the topic, volume function has to be called twice (Guess how long that took to figure out), if you place files in the root of the SD card it has to be 000x.mp3, but if you place it in a folder it has to be 00x.mp3. despite all of these functions and redundancies, I've had to make my own shuffle function, because it only has "random" which doesn't care how many times it repeats one song in a row... It has "IO" input for next/prev and vol+/- and also you can hook up an array of 20 buttons to handle those functions, where 14 of those buttons just do "segment XX" (???)
Point being, I really think something with the module that I can't do anything about is causing this sound. I also checked another module, same exact noise. I've learnt a lot and been frustrated a lot too, but reading over this does make me laugh at all the weirdness.
Everything. Which is a blessing and a curse in this respect. My motivation for this project is to seperate music playing from my phone, as it is a lot heavier and cumbersome to operate, if your phone in your pocket and get a text you gotta fish it out, unwrap the cord send a text and try to stuff it back in. (among other reasons why) This project has tactile buttons for everything and can be operated from memory. I'm happy to report that I'm getting there!Also, I'm left with the question of what this module is really for.