boss rev755

bdgf2004 · 16th January 2012, 02:18 PM

is it acceptable to replace an IRF540N with an IRF540? i've been told that replacing a 540 with 540N will not work sometimes but i'm not sure about the opposite. this one came in with one bank of outputs shorted on each channel. i turned the bias all the way down and checked the drivers and resistors. but when i power up the amp (limited current) the new fets get hot very fast (no audio).

Osvaldo de Banfield · 16th January 2012, 02:44 PM

Verify the driver at the gate of the MOSFET. A bad transistor or diode in the gate can bias the fet at class A or directly into full on condition. I work daily with SMPS´s an motor drivers, and anytime the fet is damaged, the driver also is.

Good luck !!!

bdgf2004 · 16th January 2012, 04:32 PM

i found the problem... i overlooked a bad FET in the output. it wasn't shorted but it was out of tolerance so i replaced that bank of FETs also and now all is good!

thanks

16th January 2012, 02:18 PM	#1
bdgf2004 diyAudio Member Join Date: Oct 2010	boss rev755 is it acceptable to replace an IRF540N with an IRF540? i've been told that replacing a 540 with 540N will not work sometimes but i'm not sure about the opposite. this one came in with one bank of outputs shorted on each channel. i turned the bias all the way down and checked the drivers and resistors. but when i power up the amp (limited current) the new fets get hot very fast (no audio).

16th January 2012, 02:44 PM	#2
Osvaldo de Banfield diyAudio Member Join Date: Dec 2011 Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina	Verify the driver at the gate of the MOSFET. A bad transistor or diode in the gate can bias the fet at class A or directly into full on condition. I work daily with SMPS´s an motor drivers, and anytime the fet is damaged, the driver also is. Good luck !!! __________________ A veces pongo un circo y me crecen los enanos... "Que se llama soledad", Joaquin Sabina, el capo.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
BOSS GE-7 NEW	vangelis	Instruments and Amps	2	7th July 2011 01:59 PM
boss amplifier	cris13fdz	Car Audio	4	8th October 2010 06:43 AM
boss amplifier need trasistors	cris13fdz	Parts	0	6th October 2010 03:19 AM
Boss American amp	mike49504	Car Audio	10	12th May 2010 04:13 PM
BOSS Amp	soundNERD	Car Audio	3	17th August 2004 12:06 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

16th January 2012, 04:32 PM	#3
bdgf2004 diyAudio Member Join Date: Oct 2010	i found the problem... i overlooked a bad FET in the output. it wasn't shorted but it was out of tolerance so i replaced that bank of FETs also and now all is good! thanks

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)