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MUSES 72320 electronic volume
MUSES 72320 electronic volume
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Old 26th January 2021, 11:42 PM   #581
amandarae is offline amandarae  Philippines
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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!
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Old 27th January 2021, 07:47 AM   #582
bambadoo is offline bambadoo  Norway
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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?
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Last edited by bambadoo; 27th January 2021 at 07:50 AM.
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Old 27th January 2021, 07:50 AM   #583
meldano is offline meldano  Germany
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MUSES 72320 electronic volume
Yes!
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Old 27th January 2021, 09:21 AM   #584
bambadoo is offline bambadoo  Norway
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Ok, use what I have and it works. 5v out of pin3.

Guess I got the wrong pinout. Vin then got shorted to gnd.
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Old 27th January 2021, 01:51 PM   #585
bambadoo is offline bambadoo  Norway
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Ok it works fine.
Behold of the beautiful test setup here

Will have to buy a new LDO thats fit to the board...
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Old 27th January 2021, 01:53 PM   #586
meldano is offline meldano  Germany
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MUSES 72320 electronic volume
Perfect
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Old 27th January 2021, 02:36 PM   #587
bambadoo is offline bambadoo  Norway
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Not to self. Read datasheets before ordering components.
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Old 27th January 2021, 04:11 PM   #588
amandarae is offline amandarae  Philippines
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Quote:
Originally Posted by bambadoo View Post
Ok it works fine.
Behold of the beautiful test setup here .
Great!! Nice to know you have sorted it out.
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