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Old 17th March 2013, 09:24 PM   #1
timwebb is offline timwebb  United States
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Default saz3k question

ok im working on this amp got it powered up. now i have 30vdc at the speaker. the op amps are looking ok from the measurements. and all the output fets and the drivers are new ic's are new. i cant find where the 30vdc is coming from.
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Old 18th March 2013, 12:47 AM   #2
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Are you measuring the DC directly across the speaker terminals?

Do you have rail-rail oscillation on the output transistors?
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Old 18th March 2013, 02:04 AM   #3
timwebb is offline timwebb  United States
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Quote:
Originally Posted by Perry Babin View Post
Are you measuring the DC directly across the speaker terminals?

yes

Do you have rail-rail oscillation on the output transistors?
i just checked and there is no oscillation.
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Old 18th March 2013, 02:11 AM   #4
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Post a photo of the board.
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Old 18th March 2013, 02:44 AM   #5
timwebb is offline timwebb  United States
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this one uses the irfp360's.
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File Type: jpg IMAG0605.jpg (618.6 KB, 33 views)
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Old 18th March 2013, 03:04 AM   #6
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Do the relays engage?

Does the amp draw excessive current when you connect a load to the speaker terminals?

If it doesn't and the voltage drops to 0v across the terminals, do you also read 0v on the output filter inductors?
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Old 18th March 2013, 03:33 AM   #7
timwebb is offline timwebb  United States
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Quote:
Originally Posted by Perry Babin View Post
Do the relays engage?
yes
Does the amp draw excessive current when you connect a load to the speaker terminals?
no.

If it doesn't and the voltage drops to 0v across the terminals, do you also read 0v on the output filter inductors?
i read 28vdc on the inductors.
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Old 18th March 2013, 04:15 AM   #8
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If the relays are engaged, you should read the same on the output filter inductors as you do on the speaker terminals. If you don't read the same voltage, the relays are either not engaged or they are defective. Confirm that you have 12v across the relay coil terminals.
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Old 18th March 2013, 04:26 AM   #9
timwebb is offline timwebb  United States
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i just put fresh solder on them they both have the same voltage now.
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Old 18th March 2013, 06:39 AM   #10
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What is the voltage?
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