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timwebb 17th March 2013 08:24 PM

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.

Perry Babin 17th March 2013 11:47 PM

Are you measuring the DC directly across the speaker terminals?

Do you have rail-rail oscillation on the output transistors?

timwebb 18th March 2013 01:04 AM

Quote:

Originally Posted by Perry Babin (Post 3415645)
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.

Perry Babin 18th March 2013 01:11 AM

Post a photo of the board.

timwebb 18th March 2013 01:44 AM

1 Attachment(s)
this one uses the irfp360's.

Perry Babin 18th March 2013 02:04 AM

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?

timwebb 18th March 2013 02:33 AM

Quote:

Originally Posted by Perry Babin (Post 3415776)
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.

Perry Babin 18th March 2013 03:15 AM

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.

timwebb 18th March 2013 03:26 AM

i just put fresh solder on them they both have the same voltage now.

Perry Babin 18th March 2013 05:39 AM

What is the voltage?


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