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Old 9th December 2009, 10:23 AM   #11
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Wondering on thoose caps what ones do i need to order so i get the right size of cap i know its 4700 uf 80 volt but i dont know what size it is like 22 to 35 mm wondering if you could help thanks
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Old 9th December 2009, 07:03 PM   #12
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Check the dimensions on this one to see if it will fit. On a board I have here, the caps are ~38mm tall. These are 40mm. You'll have to determine if the extra height will cause any problems.
Digi-Key - P7512-ND (Manufacturer - ECO-S1KA472EA)
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Old 14th December 2009, 10:27 PM   #13
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I orderd new outputs for this amp irf640's. Thet sent me irf640's but a to262 package instead of to220 Wondering if theese will work?
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Old 14th December 2009, 10:32 PM   #14
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They are the same part so they should work without any problems. That said... If this is for a paying customer, you should reorder the correct parts. You could use these temporarily to allow you to determine if there were any other problems.
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Old 16th December 2009, 04:30 PM   #15
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Ok i have the first amp fixed 100% working. The second amp is also the same (massive 1500.1). The problem im having with this amp is on the outputs i replaced the output and as soon as i hook the remote wire up the outputs blow up. I checked the drivers but they test ok and also tested the resistors they also check fine.

Wondering if i should replace the drivers and resistors or where should i go from here?
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Old 16th December 2009, 04:37 PM   #16
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Did you confirm that the drive waveform on the gate of the outputs was essentially the same as the waveforms posted earlier in this thread (before installing the outputs)?

Are all of the gate resistors for the outputs within tolerance?
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Old 16th December 2009, 04:59 PM   #17
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Ok further checking some of the gate resistors were bad. And 2 of the drivers were also bad. the drivers are marked 2t and 2x wondering if u know the part numbers i need for theese so i can order them
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Old 16th December 2009, 05:37 PM   #18
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mmbt4401 and mmbt4403

If you need part numbers and have the codes google 'smd codebook'.
smd codebook - Google Search
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Old 16th December 2009, 05:43 PM   #19
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Ok thanks Perry. The other question is the surface mount resistors (10 ohm)
they look like 1/8 watt since they are tiny wondering whats the package i need to order?
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Old 16th December 2009, 06:14 PM   #20
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You have to use the physical size. The wattage rating will vary depending on the construction.

These are 0805.
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