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Old 9th May 2011, 12:38 AM   #1
timwebb is offline timwebb  United States
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Default brutus 1600w

ok i got this amp had a blown powers supply so i replaced fets gate resistors and drive transistors. the one in there were cracked i replaced them and they are over heating fast.
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Old 9th May 2011, 12:52 AM   #2
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How much current is it drawing?
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Old 9th May 2011, 01:32 AM   #3
timwebb is offline timwebb  United States
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5 amps. it comes on and idles.
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Old 9th May 2011, 01:34 AM   #4
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Do you have a scope?
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Old 9th May 2011, 01:35 AM   #5
timwebb is offline timwebb  United States
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yes
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Old 9th May 2011, 01:45 AM   #6
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Clamp the FETs tightly to the sink and check the drive signal at the gates of the power supply FETs. Does the falling edge of the waveform drop straight down to below 2v?

If you're not sure, post photos of the waveforms.

If you get tired of me asking what equipment you have (there's no way for me to remember what equipment everyone has), use your sig file to list the equipment you have (power supplies, meters, scope...).
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Old 9th May 2011, 02:24 AM   #7
timwebb is offline timwebb  United States
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...
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Old 9th May 2011, 02:26 AM   #8
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Post one of the drive signal on pin 9 of the 7500/494.
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Old 9th May 2011, 03:20 AM   #9
timwebb is offline timwebb  United States
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there is not a signal there.
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Old 9th May 2011, 03:27 AM   #10
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Pin 10?

Which IC are they using?
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