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Chip Amps Amplifiers based on integrated circuits

how can I fix this.. please help.
how can I fix this.. please help.
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Old 22nd December 2017, 01:11 PM   #1
xXBrunoXx is offline xXBrunoXx
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Unhappy how can I fix this.. please help.

Hello, I recently build a mini sistem, one old cd-rom that can play by it self cs tracks, and one tda7394, problem is if tbey both share the same power supply (pc psu) I hear in the speakers all the '' cd spinning'' if I connect the tda to other power supply there's no noise, no strange cd spinning sound. Can I fix this without usi using two power supplys?. Thank you.
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Old 22nd December 2017, 03:20 PM   #2
AndrewT is offline AndrewT  Scotland
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seems there is interference.
First
look at your amplifier and assess it RF attenuation capability. From there accept as is, or improve it, or throw it in the bin.
Second
look at the emi emitting capability of the CD rom. Does it send loads of crap down the power lines. Accept as is, or improve it, or throw it in the bin.
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Old 24th December 2017, 03:32 AM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by AndrewT View Post

look at your amplifier and assess it RF attenuation capability. From there accept as is, or improve it, or throw it in the bin.
Try a 2k2 and 2200pf RC filter on front end of amp.
It that fixes it then you are getting RF interference.
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Old 27th December 2017, 04:53 PM   #4
OffGridKindaGuy is offline OffGridKindaGuy  United States
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Perhaps ground loop? Isolate the audio path from the two and see what happens.
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Old 28th December 2017, 05:45 PM   #5
xXBrunoXx is offline xXBrunoXx
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Yes , it was some kind of ground loop, I put all the GND,s to one point on the box, now the " cd sound " is very low .
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Old 28th December 2017, 06:39 PM   #6
OffGridKindaGuy is offline OffGridKindaGuy  United States
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Install one of these in the audio path. These are the best I've ever used..


KROAK Car Auto 3.5mm Aux Audio Noise Filter Ground Loop Isolator Eliminate Car Electrical Noise-in Bluetooth Car Kit from Automobiles & Motorcycles on Aliexpress.com | Alibaba Group
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