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Chip Amps Amplifiers based on integrated circuits

TDA7265 Humming
TDA7265 Humming
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Old 6th February 2010, 04:02 AM   #1
sexya is offline sexya  India
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Default TDA7265 Humming

hiii
i had used this amp earlier but now when i rebuilt it is sort of humming when no input is give and volume is at max, ( speaker kept next to ear)

and i ahve toriod transformer , 2 4700/35v caps per rail and 104 poly cap on the ic about 4 mm away frompin
posted the pcb, it is made as per the datasheet only change is i dont have mute circuit and my feed back resistor for gain are on the tother side complared to datasheet

help needed
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Old 7th February 2010, 07:22 PM   #2
Minion is offline Minion  Canada
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So with No input and the Vol at max it hums ?? I haven"t played with many amps that didn"t hum with the Vol at max with no input , I believe it is normal .....
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Old 8th February 2010, 10:14 AM   #3
sexya is offline sexya  India
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after taping thing and tie it and doing twisted wire's its gone silent. will post pic shortly
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Old 10th February 2010, 01:47 AM   #4
lanchile is offline lanchile  United States
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Quote:
Originally Posted by sexya View Post
after taping thing and tie it and doing twisted wire's its gone silent. will post pic shortly
Good to hear that! I bet you had a big antenna with all the wires lol.
yeah, we need pictures!
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Old 10th February 2010, 07:25 AM   #5
sexya is offline sexya  India
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Quote:
Originally Posted by lanchile View Post
Good to hear that! I bet you had a big antenna with all the wires lol.
yeah, we need pictures!
hi here are some pictures of the amplifier
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Old 10th February 2010, 07:38 AM   #6
mjf is offline mjf  Austria
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hello.
......it looks like there is a preamp on the backside.........it is built in near the big transformer.......that could cause the humming.
greetings
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Old 10th February 2010, 10:49 AM   #7
sexya is offline sexya  India
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i'm not aware if toroid,s caused any hum but now the hum's gone and that pre needs a micro controller to use. Which is not installed yet. And i'm giving it direct input to amp
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