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4th December 2008, 08:11 PM
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#1 |
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diyAudio Member
Join Date: Jun 2008
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New sick amplifier
Again arrive to me this broken amplifier.
This is one 4040DSM by the punch. The power source is blown.  I find two different mosfets; are two IRFZ44 and two IRFZ46.  ¿What are the right part number? ¿Some one remember the right part for the drivers? I view two resoldered marked like “2A”  The rectifiers diodes, one is resoldered (maybe changed) marked LM7915CT and the original is 7815CT. The amplifier section, apear be fine. I will buy some parts today from Newark. ¿should I buy any more to prevent time delay? |
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4th December 2008, 09:44 PM
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#2 |
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diyAudio Member
Join Date: Oct 2003
Location: Near the sea
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7815 and 7915 are +15V and -15V regulator ICs respectively.
The mix of IRFZ44 and IRFZ46 in the power supply is probably due to a bad repair job and it's enough by itself to cause trouble.
__________________
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4th December 2008, 09:49 PM
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#3 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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The 2A parts are MMBT3906s.
The original FETs were probably BUZ11s but either the Z44 or the Z46 would be a good sub.
__________________
Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links |
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