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Old 13th April 2012, 03:30 AM   #1
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Default Lanzar OPTIDRIVE 2150

Anyone have a pic of the board around the SG3525 ??


Or possibly know the value of R72 ?
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Old 13th April 2012, 09:48 PM   #2
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The orginal power supply fets are P50N06'S with10 ohm gate resistors..


If i switch the fets over to IRF3205's would i need to change the value of the gate resistors and if so what value ??


The drivers for the power supply are 2N4401 and 2N4403
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Old 13th April 2012, 11:36 PM   #3
ultra is offline ultra  Greece
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Can you be a bit more specific about the location of R72?

I got the schematic of a similar amp (125Wx2).

If you change to IRF3205, 47R is a good gate value.
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Old 14th April 2012, 03:19 AM   #4
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I was going thru my stuff and found some STP60N06'S

Would thoose work better then the 3205's as replacements for the
STP50N06'S ??


If so would i need to change the value of the gate resistors from 10 ohms ??


STP60N06-14 pdf, STP60N06-14 description, STP60N06-14 datasheets, STP60N06-14 view ::: ALLDATASHEET :::



STP50N06 pdf, STP50N06 description, STP50N06 datasheets, STP50N06 view ::: ALLDATASHEET :::
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Old 15th April 2012, 01:36 AM   #5
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The 10 ohm gate resistors will work with any of the FETs you listed.

If you're looking for the value of a burned resistor near the PS driver IC, it's likely one of the two resistors that are connected to the output pins of the IC. It's a low value resistor (100 ohms or less). Find the one connected to the other output pin of the IC to get the value.
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