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Old 4th May 2007, 10:57 AM   #1
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Default TDA1557Q start bum

Does anyone know how to get rid of boom when I turn on my amp? BTW this boom is not heard when the signal cable is not in the amp.

TNX
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Old 4th May 2007, 11:41 AM   #2
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Data sheet of TDA1557 says:
Quote:
No switch-on/switch-off plop
must be some other reason otherwise if the chip's data sheet says it has build in compensation for powerup thump then it is true.
You need to check mute/standby configuration.
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Old 4th May 2007, 12:12 PM   #3
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Does anyone have a circuit which works with no on/off plop?
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Old 4th May 2007, 12:44 PM   #4
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This phenomenon is generally caused from wrong grounding problems and DC offsets on output.
For example I had three TDA1514A amplifiers. In the datasheet they write "no switch on / off clicks" however I had. Then I desoldered all components then matched all resistors and make a good start grounding.
After a full hour works it worked perfectly and no switch on/off plops.
Another example; I have a discrete amplifier and it has exactly no switch on or off plop blocking circuit, but I cannot hear any plop on switching.
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Old 4th May 2007, 12:44 PM   #5
Dxvideo is offline Dxvideo  Turkey
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This phenomenon is generally caused from wrong grounding problems and DC offsets on output.
For example I had three TDA1514A amplifiers. In the datasheet they write "no switch on / off clicks" however I had. Then I desoldered all components then matched all resistors and make a good star grounding.
After a full hour works it worked perfectly and no switch on/off plops.
Another example; I have a discrete amplifier and it has exactly no switch on or off plop blocking circuit, but I cannot hear any plop on switching.
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Ozgur
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