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Audison SRX
Audison SRX
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Old 13th November 2017, 11:38 AM   #1
NadaD is offline NadaD
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Default Audison SRX

Got this amplifier with blown PS fets.
Before installing new fets, i scoped drive signal - which was good.
Installed new fets, new drivers and amplifier now is drawing excessive current.

I removed rectifier from board to isolate output section - no luck.
Could be SG3525 bad? Which shows only under load, because before drive signals were good.

Audison SRX1
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Old 13th November 2017, 01:32 PM   #2
MarioRestucci is offline MarioRestucci  Italy
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bad transformer?
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Old 13th November 2017, 05:26 PM   #3
NadaD is offline NadaD
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Dont want to believe it, as its pain in the *** to remove it.

Powered up through bulb, twisting, pulling/pushing transformer, doesn't change current draw, of course all PS gets warm equally.
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Old 13th November 2017, 06:10 PM   #4
PetruV is offline PetruV  Romania
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Check Gate resistors and pullup resistors,and also diodes used for the gates
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Old 14th November 2017, 07:49 AM   #5
MarioRestucci is offline MarioRestucci  Italy
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Quote:
Originally Posted by PetruV View Post
Check Gate resistors and pullup resistors,and also diodes used for the gates
big quote!!
I forgot, if you have one or more defective gate resistors, the MOSFET load may not be the same for everyone, and worse, if the gate resistors are interrupted, the power supply may not work well and MOSFET would heat up very quickly, absorbing a large amount of current from your main power supply.
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Old 14th November 2017, 10:17 AM   #6
NadaD is offline NadaD
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They are all within tolerance, diodes also measures ok, seems like i am leaving with transformer, if i am not missing something of course.
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Old 21st November 2017, 07:12 AM   #7
ppalli is offline ppalli  Italy
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What is the SRX model and what is the frequency of the driver signal (without mos)?
If you could post a picture, it would be usefull
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Old 21st November 2017, 05:24 PM   #8
NadaD is offline NadaD
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On all gates the same drive signal.


Audison SRX1
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Old 28th November 2017, 07:57 AM   #9
ppalli is offline ppalli  Italy
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I asked you for a picture of the SRX1 because there are two types, the first one having the blue heatsink and the second type that is black
I never happened to have the trsf shortcut
If, without the power rectifier, the current is very high, try to figure out if there is any component on the pcb (not the fets) that heat up a lot or if the wires of the trsf get very warm. Also try to see if there are any burnt track
I know it's difficult but if you can, post 2 picture of the Drain mosfet waveform, on both side of trsf, after turning-on the amplifier (before making any damage, even if it drawing high current, just for 1 sec)
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Old 28th November 2017, 09:43 AM   #10
NadaD is offline NadaD
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Well, I will try it later. Its blue cased.

Also i tried to load transformer with few fets.
I dont know how to explain easier, but when there is installed only 2 fets - it works OK, draws about 400mA. Current increases as I install more fets.

Last edited by NadaD; 28th November 2017 at 10:06 AM.
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