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Old 15th July 2009, 08:29 AM   #1
bobcat is offline bobcat  United Kingdom
diyAudio Member
Join Date: Jan 2004
Location: devon england
Default Maplin mosfet problems

Hi all i have just built one of these using a genuine board and all the correct discrete transistors all available from rs, but i have a problem the amp works fine but the driver tr's get very hot in fact too hot to touch after about an hour of normal use the supply voltage = 50 0 50, quiescent current is set to 100ma and there is virtually no dc at the output. Any help appreciated B\c
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Old 15th July 2009, 08:58 AM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
what bias current passes the drivers in the quiescent state?
What heatsinks are fitted to the drivers?
Are the driver Collectors isolated from ground?
regards Andrew T.
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