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Old 5th May 2010, 08:00 PM   #11
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Do you have rail voltage on the 0.1 ohm resistors (black probe on the amp's ground terminal)?

Did you measure across the resistor or from ground?
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Old 5th May 2010, 08:13 PM   #12
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Quote:
Originally Posted by Perry Babin View Post
Do you have rail voltage on the 0.1 ohm resistors (black probe on the amp's ground terminal)?

Did you measure across the resistor or from ground?
from ground to resistor/rail.
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Old 5th May 2010, 08:17 PM   #13
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'Across' means one probe on each end of the resistor. There's no point in measuring across until you reconnect the power supply transistors and change the resistors. At that point, I doubt you'll have any more problems with the amp.
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Old 5th May 2010, 08:30 PM   #14
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Quote:
Originally Posted by Perry Babin View Post
'Across' means one probe on each end of the resistor. There's no point in measuring across until you reconnect the power supply transistors and change the resistors. At that point, I doubt you'll have any more problems with the amp.
My bad its 0v on all of them and i will change the resistors on the irf3205 to 47ohms should i change the resistors on the mtp75n05hd also?
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Old 3rd August 2011, 10:01 PM   #15
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Hey Perry i know this is old i was looking at the Schematic for the fosgate 601S and they use the irf 3205 with a 51ohm gate resistor in the power supply. My Question is can i use the same setup as the 601S in the 800@2 power supply.

Last edited by Brain Fried; 3rd August 2011 at 10:05 PM.
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Old 3rd August 2011, 10:22 PM   #16
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That should be OK. In amps with gate resistors of 51 ohms or less, I leave them when I use the 3205s. Anything higher, I replace them with 47 ohm resistors. If you want to change the 68 ohm gate resistors to 51 ohm resistors instead of 47, that would be OK.
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