TDA7265 Humming

sexya · 6th February 2010, 03:02 AM

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

Minion · 7th February 2010, 06:22 PM

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 .....

sexya · 8th February 2010, 09:14 AM

after taping thing and tie it and doing twisted wire's its gone silent. will post pic shortly

lanchile · 10th February 2010, 12:47 AM

Quote:

Originally Posted by sexya

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!

sexya · 10th February 2010, 06:25 AM

Quote:

Originally Posted by lanchile

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

mjf · 10th February 2010, 06:38 AM

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

sexya · 10th February 2010, 09:49 AM

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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7th February 2010, 06:22 PM	#2
Minion diyAudio Member Join Date: May 2006	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 .....

8th February 2010, 09:14 AM	#3
sexya diyAudio Member Join Date: Jun 2007 Location: Bombay/India	after taping thing and tie it and doing twisted wire's its gone silent. will post pic shortly

10th February 2010, 06:38 AM	#6
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	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

10th February 2010, 09:49 AM	#7
sexya diyAudio Member Join Date: Jun 2007 Location: Bombay/India	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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