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Old 27th December 2009, 12:38 AM   #11
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They are using buz 102's for the power supply fets.

Right now they have a 165 ohm and a75 ohm resistor tied together for the gate resistors
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Old 27th December 2009, 12:47 AM   #12
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Measure the resistance from pin 4 of the TL494 to pin 7 of the 494. What is the resistance?
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Old 27th December 2009, 12:52 AM   #13
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yes this is a zed made amp heres a pic of the gates some one put in =240 ohms. I think they are suppose to be 220 ohm resistors since he was talking about the dead time and telling me the reason they used so high of a value in them is to slow down the supply like the amp wont turn on so fast
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Old 27th December 2009, 12:56 AM   #14
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It would make the FETs turn on/off more slowly and could have been done to prevent ringing on the power supply transformer. To make the amp turn on more slowly, he likely would have used one of the inputs on the 494.
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Old 27th December 2009, 12:58 AM   #15
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for some reason it wont let me load the pic
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Old 27th December 2009, 12:58 AM   #16
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It's likely because the file size is too large.
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Old 27th December 2009, 01:00 AM   #17
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the resistance from pin 4 to pin 7 on the tl494 is 214 ohms
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Old 27th December 2009, 01:11 AM   #18
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That means it very likely has dead-time built in and the 220 ohm resistors may be the correct value.

After replacing the resistors, remember to confirm that the idle current doesn't increase when you reduce the 12v supply voltage to ~11v.
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Old 27th December 2009, 02:17 AM   #19
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ok i replaced all the gate resistors 18 of them.

i was checking the rectifiers and found one with the leads broke off
its a fes16jt wondering where i can find theese since the only thing i have laying around is a mur815 and dont think that will work
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Old 27th December 2009, 02:28 AM   #20
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If the rail capacitors are rated for 75v or less, the MUR815 may work (it's rated for 150v). The original is rated for 600v. The replacement doesn't need to be rated for 600v but should be rated for at least 2x the rail voltage (measured rail to ground).

If you can get the amp to power up, you can measure the rail voltage. Measure from the positive rail to a non-bridging speaker terminal and from the negative rail to a non-bridging speaker terminal.
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