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Bertje 1st January 2009 11:06 AM

Noise from Ground Zero GZPA1.5000SPL
I have this class D poweramp for repair here.
When turn on with just a speaker connected, without RCA, I can here a lot of noise. From SMPS??

Everything else is working OK, delivers al lot of power.

Idle current is 3,5-4A

Output filters are OK.

Any suggestions?


luka 1st January 2009 11:25 AM

what noise? from where? inside of amp? from speaker?

Bertje 1st January 2009 12:25 PM

From the speaker, high frequenty noise. The SMPS itself is quiet and is working normal.
I measured at the primary side squarewaves with a little overshoot, I think it's normal.

luka 1st January 2009 11:15 PM

Small sinewave on output is normal [this is how D amps works], few Vpp at some high freq., @ what amp works, say about 100kHz or so [output stage]...

You can check this before output inductor... you have two, since this amp is bridge already if i'm not mistaken...

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