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21st December 2009, 02:56 AM
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#1 |
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diyAudio Member
Join Date: Sep 2006
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rockford fosgate bd15001
When you hook power up to this amp the light blinks and u can hear the torriod hissing loudly. I checked the fets and outputs all test good. I tryed twisting the torriod it quiets it a lil til u let go and then hiss's loud again
Wondering what i should check next? |
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21st December 2009, 03:04 AM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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I'm not sure which amp this is. Can you post a photo of the guts?
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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21st December 2009, 03:15 AM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Is it drawing excessive current?
Does it have any DC on the speaker terminals? What DC voltage do you have on pin 6 of U21?
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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21st December 2009, 03:22 AM
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#5 |
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diyAudio Moderator Emeritus
Join Date: Oct 2002
Location: Bandung
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One time I can reduce the noise by painting transformer glue (something like elastic nail polish) to the toroid (to bond the wires) and deflecting that black/red cable (next to the toroid) away from the toroid.
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21st December 2009, 03:31 AM
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#7 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Does the amp produce audio and the only problem is the hissing?
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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21st December 2009, 03:42 AM
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#9 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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When driving the amp with a strong preamp signal (~1v) and the gains set to at least 1/2, do you have any audio on pin 1 of U4?
What is the DC voltage measured directly across the red and black wires? Be careful not to allow the probes to short to anything when measuring the voltage.
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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