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Old 9th November 2012, 05:23 AM   #11
pra3718 is offline pra3718  India
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Quote:
Must the LM1876 have both pins 2 and 15 connected?
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Old 9th November 2012, 07:30 AM   #12
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Yes I can see you have them both connected.
Must they be? Or can you use just one?
I really do not know this and im curious about it.
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Old 9th November 2012, 07:53 AM   #13
pra3718 is offline pra3718  India
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Pin 2, 15 should be connected to +V, it depend on you how do you connect.
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Old 9th November 2012, 08:59 AM   #14
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OK,

if there is an alternative to choose from, either pin 2 or pin 15 connected.
Then I believe you have a possibility to make a much smaller PCB and realise Andrews advise in that.
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Old 9th November 2012, 09:06 AM   #15
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Pin 2 is the Vcc connection for one amp, pin 15 is Vcc for the other. If you measure 0.00 ohms between the pins it may not make any difference, but you most likely have to connect both (because it won't be 0.00 ohms).
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Old 9th November 2012, 12:03 PM   #16
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Quote:
Originally Posted by AndrewT View Post
But the 1876 only has one Vcc Pin.
This is the typical rubbish posted by ill-informed Members.
Take your version of pin outs to another Forum.

Oh you deleted the post. How unsporting!

Last edited by Robert Kesh; 9th November 2012 at 12:26 PM.
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Old 10th November 2012, 03:31 PM   #17
pra3718 is offline pra3718  India
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Another try
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Old 10th November 2012, 03:34 PM   #18
AndrewT is offline AndrewT  Scotland
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You are on the right track/trace.
Instead of the Zobel coming to the front of the PCB. Could you take it straight back to the decoupling ground?
Ah! single sided stops that. How about a wire link?
RF filters?
Is Pin10 clean? I would take that to Power Ground, if there is a risk it could contaminate Signal Ground.
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Last edited by AndrewT; 10th November 2012 at 03:40 PM.
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Old 10th November 2012, 03:47 PM   #19
pra3718 is offline pra3718  India
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Thanks,

Parts selection :

Cin = 1uf
Rin = 10k
Rb = 220r
Ri = 220r
Rf = 10k
Rsn = 4.7r
Csn = 0.1uf
Cs = 0.1uf
= 10uf
= 1000uf

Gain = 45
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Old 10th November 2012, 03:52 PM   #20
AndrewT is offline AndrewT  Scotland
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Cin Rin @ 10ms will severely cut low bass and affect upper bass.

Gain at 45times would require only 440mVac for clipping of a 50W into 8ohms amplifier. Even lower (340mVac) for a 60W into 4ohms amplifier. Are your Sources that low in output?
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