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Chip Amps Amplifiers based on integrated circuits

Whats Wrong with My Chips!
Whats Wrong with My Chips!
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Old 23rd April 2004, 01:46 PM   #1
Marvellous is offline Marvellous  South Africa
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Default Whats Wrong with My Chips!

Yesterday I Made my first gainclone 2x_LM3886 & 2X_LM3875
after being solid state crazy for a very long time
I must say I expected verry little from these
little chips but I was blown away by their sound quality
and output was lot more than what I expected

I build mine from the Decibel Dungeon Site for both Chips

the problem on my is when I add the zobel network on my
Lm3875 I get a loud buzz on the output
without it it is dead quiet!

& When I try To add 100n decoupling caps to LM3886
I get a loud buzz on the output
without them it is dead quiet!

I cant understand why this happens
as far as I understand they sould both be
basically the same thing just one with more
power!

the lm3875 works fine with decoupling Caps
the lm3886 works fine with Zobel Network!

The big Question is Why?
Thank U in Advance!
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Old 23rd April 2004, 02:11 PM   #2
Ropie is offline Ropie  United Kingdom
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Hi,

What kind of capacitor are you using for the zobel?
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Old 28th April 2004, 07:01 AM   #3
Marvellous is offline Marvellous  South Africa
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Sorry for the delayed reply!

10E 1watt resistor & 100nf Ceremic zobel network

100nf Ceremic for Decoupling Caps
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Old 28th April 2004, 07:30 AM   #4
analog_sa is offline analog_sa  Europe
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Quote:
The big Question is Why?
Bad grounding layout seems like a reasonable answer.
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Old 28th April 2004, 09:38 AM   #5
Marvellous is offline Marvellous  South Africa
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Ill Try & Change it Today & see if there is a Change

But shouldn't I always get a hum if I have grounging
problems?

Thanks Again!
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Old 29th April 2004, 12:16 PM   #6
Marvellous is offline Marvellous  South Africa
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changed my grounding X4 still same problem!

I guess my lm3875 will have to do without Zobel Network!
& my lm3886 will have to do without decoupling Caps

But I Have to say I expected less from GainClones!
Their Sound is Amazing!
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