Electronics > Beginners
Need help with noise on headphone amp! (op-amp issue?)
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Mp3:

--- Quote from: Whales on September 12, 2019, 09:26:50 am ---Ninja edited with more details, apologies.

--- End quote ---

Not a problem! I know i've been refreshing this page like mad  :palm:


--- Quote from: blackdog on September 12, 2019, 09:27:15 am ---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

--- End quote ---

Thank you Bram!!

 for clarification: when you say power splitters, you mean with resistors? or also you mean this is bad too?  https://www.amazon.com/gp/product/B0752CK8DK/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

I am looking around online for bipolar power supply, i won't use a switching supply! it's hard to find one, though. This looks like it might be good:
https://www.ebay.com/itm/Car-Audio-Isolated-Power-Supply-Module-Buck-Converter-DC-12-6-24V-To-12V-Output/332134726757?hash=item4d54c5bc65:g:eJkAAOSwDrBc3c6Q
DimitriP:

--- Quote --- I do not have the power ground hooked up at all since i don't know what to do about it.
--- End quote ---
When you have three power connections to make and only two leads from a power supply, you STOP!
In the meantime why not use two lousy 9V batteries to see if the thing works before this thread gets any longer ?

themadhippy:
for testing 2  9v batteries should get you going,infact the original circuit diagram shows the chip supply as +9v and -9v
Mp3:
I tested with two 9v's and all is good. My amp sounds great now. Thank you, thank you both.  :-+

I will await delivery of my isolated bipolar power supply and think this thread has served its purpose and for that I am very grateful  :-/O
magic:
This schematic shows how to make a passive rail splitter from unipolar 18V. Few things are simpler than that.

https://diyaudioprojects.com/Chip/CMoy-Grado-RA1-Headphone-Amp/
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