Maplin mosfet problems

bobcat · 15th July 2009, 08:29 AM

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

AndrewT · 15th July 2009, 08:58 AM

Hi,
what bias current passes the drivers in the quiescent state?
What heatsinks are fitted to the drivers?
Are the driver Collectors isolated from ground?

15th July 2009, 08:29 AM	#1
bobcat diyAudio Member Join Date: Jan 2004 Location: devon england	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

15th July 2009, 08:58 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, 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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