MUSES 72320 electronic volume - Page 59

amandarae · 26th January 2021, 11:42 PM

Hi,
I built two of this and both are working fine with or without the display (Adafruit) and with or without using the LDO. After I solved my noise problem and doing some experimenting, I observed that it work if the supply is less than +-15 but with the +5V external (from a different supply). I was unable to "fire" it up if I use less than +-15 and internal +5V.
The specs says +-8.5V to +-18V. But I am not sure why on my two units, I have to use external 5V if my supply is less than 15. Hope you find the problem!

bambadoo · 07:50 AM

Thats interesting but I dont think it explains this?

Only running the controller board now and the LDO circuit is fed with +14v (also tried +10v). Ideally I assume approx 6-7Vdc would be perfect for that purpose.
No display connected
Of course I can crank it up some but I cannot understand how that would improve things?

Only thing I can come up with is that Mouser sent me LDO with different pinout? (D-config)
This was what I ordered
https://no.mouser.com/ProductDetail/...rrencycode=NOK

https://no.mouser.com/datasheet/2/38...20-1374943.pdf

Not sure how I can check that yet, and could that cause this problem?

meldano · 27th January 2021, 07:50 AM

Yes!

bambadoo · 27th January 2021, 09:21 AM

Ok, use what I have and it works. 5v out of pin3.

Guess I got the wrong pinout. Vin then got shorted to gnd.

bambadoo · 27th January 2021, 01:51 PM

Ok it works fine.
Behold of the beautiful test setup here

Will have to buy a new LDO thats fit to the board...

meldano · 27th January 2021, 01:53 PM

Perfect

bambadoo · 27th January 2021, 02:36 PM

Not to self. Read datasheets before ordering components.

amandarae · 27th January 2021, 04:11 PM

Quote:

Originally Posted by bambadoo

Ok it works fine.
Behold of the beautiful test setup here

.

Great!! Nice to know you have sorted it out.

26th January 2021, 11:42 PM	#581
amandarae diyAudio Member Join Date: Oct 2004 Location: Diamond Bar, CA USA	Hi, I built two of this and both are working fine with or without the display (Adafruit) and with or without using the LDO. After I solved my noise problem and doing some experimenting, I observed that it work if the supply is less than +-15 but with the +5V external (from a different supply). I was unable to "fire" it up if I use less than +-15 and internal +5V. The specs says +-8.5V to +-18V. But I am not sure why on my two units, I have to use external 5V if my supply is less than 15. Hope you find the problem! __________________ The power supply of my power supply is my FRIEND!

27th January 2021, 07:50 AM	#583
meldano diyAudio Member Join Date: Jul 2005 Location: Ruhrgebiet	Yes! __________________ Muses v2 Volume Kits available https://www.diyaudio.com/forums/swap...es-volume.html

27th January 2021, 01:53 PM	#586
meldano diyAudio Member Join Date: Jul 2005 Location: Ruhrgebiet	Perfect __________________ Muses v2 Volume Kits available https://www.diyaudio.com/forums/swap...es-volume.html

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