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Old 16th April 2010, 06:51 PM   #1
chipper is offline chipper  United States
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Default I have a question about outputs on RF amplifiers?

I have a rf punch 40x2 it works powers on fine but the right channel puts out DC voltage it's deliverings it's full rail voltage to the speaker. What's causing this problem? Bad outputs? They are IRF540 and IRF9540. Or if not the outputs what else could it be? Thanks
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Old 16th April 2010, 07:17 PM   #2
chipper is offline chipper  United States
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Any know what's wrong???
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Old 16th April 2010, 07:28 PM   #3
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Bad outputs my 800a2 did the same thing.
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Old 16th April 2010, 07:36 PM   #4
chipper is offline chipper  United States
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Quote:
Originally Posted by Brain Fried View Post
Bad outputs my 800a2 did the same thing.
Okay my best bet is to order a new set of IR fets. Do you happen to have any? I'm kinda afriad of buying counterfeit transistors. Haha orrr I have a blown punch 225.2 sitting here that has the same fets. But those mite be shorted.
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Old 16th April 2010, 07:43 PM   #5
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Quote:
Originally Posted by chipper View Post
Okay my best bet is to order a new set of IR fets. Do you happen to have any? I'm kinda afriad of buying counterfeit transistors. Haha orrr I have a blown punch 225.2 sitting here that has the same fets. But those mite be shorted.
could be if i was you i wait for Perry to reply to your thread he the man you want to talk for troubleshooting you amp's.
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Old 16th April 2010, 08:17 PM   #6
chipper is offline chipper  United States
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I can't find an IRF9540 fet anywhere!!
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Old 16th April 2010, 08:47 PM   #7
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I've never purchased from this seller but they have the parts you need.
Gerber Electronics - Browse Parts - Our Greatest Component is Your Satisfaction

Did you find that one of the 9540s was shorted?
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Old 16th April 2010, 10:12 PM   #8
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
I've never purchased from this seller but they have the parts you need.
Gerber Electronics - Browse Parts - Our Greatest Component is Your Satisfaction

Did you find that one of the 9540s was shorted?
Yes indeed I did find it to be shorted out. It had a very low resistance when I pulled them out. Do you think it's just a bad output MOSFET?
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Old 16th April 2010, 11:03 PM   #9
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Quote:
Originally Posted by chipper View Post
I can't find an IRF9540 fet anywhere!!
Go here > IRF9540 19A, 100V, 0.200 Ohm, P-Channel Power MOSFET (IR)-The Electronic Goldmine

Last edited by Brain Fried; 16th April 2010 at 11:06 PM.
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Old 16th April 2010, 11:16 PM   #10
jol50 is offline jol50  United States
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This one?
Digi-Key - IRF9540PBF-ND (Manufacturer - IRF9540PBF)
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