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PostPosted: 24 Mar 2010, 13:53 
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Joined: 17 Jan 2010, 13:50
Posts: 20
Location: Frederick, MD
Hello,

I'm building my first Chipamp (LM3886) and I've stumbled at first power up. I can't get voltage on the secondary windings. I'm using an Antek - 3218, 300Va, 18+18. I'm connecting the primary for 120V and I have connected the secondaries in series, yet I got nothing. I disconnected the rest of the circuit from the rectifier and still nothing. I separated the two middle wires (which I'd connected to make the center tap) and still nothing. Could it be I have a bad transformer?

Thanks for your help,

Luis

EDIT: I just ohm'd out the tranformer and it looks good; no resistance between the two secondary wires.

EDIT: Oh, never mind. I had teh Primary connected wrong. It is working now. Will report when all is connected and I have a listen. Thanks anyway...


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PostPosted: 27 Mar 2010, 22:10 
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Joined: 17 Jan 2010, 13:50
Posts: 20
Location: Frederick, MD
Ok, I have the amp completed and no smoke this time. I fried the rectifier earlier; had a short between one of the connections and the heatsink. Point to Point on crowded spaces is not my forte. I test for DC offset with no load and I have 3 mv in one channel (at 0 vol) but have 320 mv on the other channel. With volume up, I have 32 mv on the 'good' channel but the other channel (the one with the short earlier) goes to -220 mv. What could cause that?

Thanks,

Luis


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PostPosted: 30 Mar 2010, 22:46 
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Joined: 28 May 2008, 21:53
Posts: 4586
Location: Winnipeg, CANADA
Which circuit did you follow? Can you post some photo.

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