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13th February 2004, 11:34 AM
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#1 |
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diyAudio Member
Join Date: Oct 2002
Location: Sweden
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Problem with high DC on speaker terminals
HI!
I finished my CG with LM3886 late last night. Joy!? Well, no. I went on measuring DC on the speaker terminals. Eek! 33V. Obviuosly I have done something wrong. I was to tired to start checking for errors last night so that became today's problem. I thought maybe you guys can give me some hints about what errors to look for... The chipamp i've built is the one found at Linkwitzlab.com  cheers/Per |
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13th February 2004, 11:51 AM
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#3 |
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diyAudio Moderator
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Do a quick voltage map- start by measuring DC voltage on each pin. 9 times out of 10, that will quickly lead you to where the error is.
__________________
"...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011 |
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13th February 2004, 02:37 PM
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#5 | |
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diyAudio Member
Join Date: Oct 2003
Location: Toronto
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Re: Problem with high DC on speaker terminals
Quote:
The speacker is connected to 0V rail and the rest of the GNDs are connected to GND simbol. The speacker should be connected also to the GND symbol and the GND symbol should be connected to 0V reail directly. The 2Ohm res is between GND/0V and Chassie. The way you have it your decapling caps have 2 ohms res in ser with the speaker. Not good IMHO |
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13th February 2004, 03:18 PM
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#6 |
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diyAudio Member
Join Date: Oct 2002
Location: Sweden
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I forgot to mention that i don't use Ro & Ci
I found out what was wrong! It aparently slipped my mind to connect the signal ground to the powerground. thanks anyways guys! I haven't listened to it yet so ti remains to see if if I have to re-wire the whole damn thing due to the sweet sound of motorboats.   Here's a pic of my amp: 
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