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Old 6th January 2012, 06:22 PM   #31
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Did you check the drive signals with the 1k resistors connected as before?
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Old 6th January 2012, 06:31 PM   #32
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I think i found the problem.. Solder bridge between the legs of 1 driver..


Im gonna replace the gate resistors anyway since they look burnt but measure fine just so it doesnt look like a cheap repair job...


The 22 ohm resistors i put in that i wasent sure of the value 1 supply it worked fine the other supply it got red hot should i try using a 2 watt resistor to see if it works?
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Old 6th January 2012, 08:39 PM   #33
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Are you sure that it's a gate resistor and not a pulldown resistor?

A lot of amps use 220 ohm pulldown resistors and they're often 1/2w resistors. 22 ohms for the gate resistors shouldn't be causing any problems.
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Old 7th January 2012, 01:05 AM   #34
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The 22 ohm resistors just keep burning up..

the resistor in question 1 side connects to the middle leg of the IRFZ44the other side connects to a winding on the transformer..

There are 220 ohm resistors next to the gate resistors what connect to the 3rd leg of the fet..

So any ideas what i could try since the 22 ohm resistors that connect to the middle leg keep burning up and the fets keep heating up in both supplys?
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Old 8th January 2012, 01:07 AM   #35
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Is the capacitor connected to the 22 ohm resistor shorted?

Did you check the drive circuit with the 1k resistors before installing the FETs?
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Old 8th January 2012, 02:29 AM   #36
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Back to having problems with the Drive circuit..

I installed 4 1K resistors again 1 in each bank..

Scope is set to .2us 2 volts div

First pic is the waveform on the gate pad for both supplys..

2ND pic is the waveform on pin 9 of the 494
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File Type: jpg SUN DOWN 002.jpg (246.2 KB, 13 views)
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Old 8th January 2012, 04:15 PM   #37
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If that's 0.2us, the oscillator frequency is too high. Check the resistor and capacitor on pins 5 and 6 of the 494.
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