Electronics > Beginners
Need help with noise on headphone amp! (op-amp issue?)
<< < (4/6) > >>
Mp3:
Hey, thanks again. I did try playing directly off a phone, and didn't notice any changes, so i am like 99% sure all my problems are because of the incorrect power supply. I bought the bipolar converter board I linked above, and the reviews say it's what people needed for their amps so i am hopeful it will solve the problem.

For now, i'm not sure i can do much else unless I can figure out how that voltage divider schematic works :)
Whales:

--- Quote from: Mp3 on September 12, 2019, 08:34:07 am ---
Thank you again! I found this and it seems to be what i want.
https://www.amazon.com/DROK-Converter-Non-isolated-Regulator-Transformer/dp/B0752TRXDC/ref=sr_1_1?keywords=negative+voltage+12v+amplifier&qid=1568277742&sr=8-1


In the meantime, i would like to learn how to implement the resistive divider, but i don't think i properly understand it. In fact, i am almost certain it is wrong. I would like to wait for advice before going further. as you can probably see, i have a hard time implementing EE theory in real life  :)



--- End quote ---

Incorrect wiring.  For this to work you:

(1) Need to wire PSU12V to amplifier+, PSUGND to amplifier-, and use the resistors to make the amplifier's ground.
(2) Need to use an isolated power supply.  The one you show and link above is not isolated.  This will lead to all sorts of *bang* problems when connecting your amplifier to other equipment.

Ie you either need a proper bipolar (3-wire) power supply or an isolated 2-wire power supply.
Mp3:

--- Quote from: Whales on September 12, 2019, 09:24:13 am ---
--- Quote from: Mp3 on September 12, 2019, 08:34:07 am ---
Thank you again! I found this and it seems to be what i want.
https://www.amazon.com/DROK-Converter-Non-isolated-Regulator-Transformer/dp/B0752TRXDC/ref=sr_1_1?keywords=negative+voltage+12v+amplifier&qid=1568277742&sr=8-1


In the meantime, i would like to learn how to implement the resistive divider, but i don't think i properly understand it. In fact, i am almost certain it is wrong. I would like to wait for advice before going further. as you can probably see, i have a hard time implementing EE theory in real life  :)

--- End quote ---

You will want an isolated power supply for this technique to work.  The GND of your amplifier gets shorted to the GND of your sound source (eg a computer) when you plug it in.

--- End quote ---

Noted! I will await delivery of my bipolar converter, and then see if everything works as it should :) Thank you all again very much!
Whales:
Ninja edited with more details, apologies.
blackdog:
Hi,

You need a symetrical powersupply for this device!!!

Buy or create a +12 and a -12V power supply don't mess with SMPS power supplies, that always interferes with audio.
Don't throw away time and money by tampering with power splitters.  :-DD

Kind regarts,
Bram
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod