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27th July 2010, 09:04 PM
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#1 |
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diyAudio Member
Join Date: Aug 2008
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Testing mosfets in circuit
In a mosfet power amplifier, using multiple-parallel mosfets, what's the surest way to check in an otherwise working amp that you haven't got the odd one gone o/c?
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27th July 2010, 09:13 PM
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#2 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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They usually fail short if that helps! With the amp playing a 50Hz tone, if you can measure any AC voltage across the source resistor then the FET is conducting OK. Compare with readings across the other resistors to improve confidence.
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27th July 2010, 10:27 PM
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#3 |
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diyAudio Member
Join Date: Aug 2008
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They don't always fail short; if they do, the amp is no longer a 'working' one!
Many designs of power amp dont use source resistors, they're all parallelled with individual gate resistors. |
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