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Old 2nd February 2011, 07:55 AM   #11
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Hold on a sec... For the irf1404 (TO220AB package)...

LEAD ASSIGNMENTS
1 - GATE
2-DRAIN
3 - SOURCE
4(tab) - DRAIN


Just check we're all talking about the same leads here as per the IRF datasheet.

This doesn't sound completely right. The most useful thing for you to do would be to grab a pencil and paper, the looking at both sides of the PCB, draw up a basic schematic of all the main power devices, transformers, IC etc with pins marked IAW the datasheet. This is a very powerful technique to understanding what's going on. I use it when I can't quite get my head around what a designer has done, and usually it all falls into place. From there we can provide much better assistance when we know exactly what your measurements are connecting to...
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Old 2nd February 2011, 08:00 AM   #12
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Perry, your post about the pic just popped up.

Please enlighten me about what they do as I haven't had the honour to dismantling an amp with a micro in it yet! i.e. does it just do PSU control and protection or does it go as far as including some of the amp functions as well (class D)?

I've got plans for another amp using the AVR PWM range of controllers.
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Old 2nd February 2011, 10:31 AM   #13
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They use the PIC in the Stetsom amps for protection logic and square wave generation for the power supply. This includes a soft start, of sorts. They go from 0-50% duty cycle in about 5 steps. The PIC in the amps I've seen had far fewer pins so this amp may do more with it.
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Old 2nd February 2011, 10:35 AM   #14
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well I guess you could do whole amp from one micro, if it was fast enough, that goes for supply pwm and amp pwm
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Old 2nd February 2011, 11:39 PM   #15
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From gate pads to PIN 1 0.391K with IC out of circuit

From gate to PIN1:1.986K with IC in circuit
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Old 4th February 2011, 09:56 PM   #16
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Back to this amp again. I have replaced anything yet. I took the power supply fets out since they were defective.


Amp wont power up the red led flashes so guessing its stuck in protection mode.

Any ideas where to start?
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Old 4th February 2011, 11:14 PM   #17
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Have you reinstalled the FETs?

Have you looked up the owner's manual? The Stetsom amps (similar in design) have codes that indicate the fault (thermal, over-current, DC offset...).
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Old 4th February 2011, 11:54 PM   #18
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ALL new fets are in the amp.

Do you know of a good site i can get the owers manual from?
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Old 5th February 2011, 03:56 AM   #19
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http://www.stetsom.com.br/Uploads/Do...9114242805.pdf

This is for a stetsom amp. Does the flashing of the red LED match what's shown on the error table?
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Old 5th February 2011, 06:07 AM   #20
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This amps led has a steady flash about 13 times then a pause then flashes about 13 times then pause and so on
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