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Old 14th December 2012, 11:21 AM   #141
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I did but i saw at the first page of the data sheet this..."Wide supply range 20V - 94V". ( http://www.ti.com/lit/ds/snas091b/snas091b.pdf)
So I am lost
Please guide me.

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Old 14th December 2012, 11:30 AM   #142
AndrewT is offline AndrewT  Scotland
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learn the difference between AC and DC voltages !
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Old 14th December 2012, 11:33 AM   #143
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Okay, what is the suitable transformer for my amp ? Sorry if I missed the earlier posts. I want to use 4 X 4700 ufd.

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Old 14th December 2012, 11:48 AM   #144
AndrewT is offline AndrewT  Scotland
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15Vac+15Vac upto 27Vac+27Vac is usable if you ensure that Vdc <=42V.
If you use lower than 8ohms speakers then the upper limit becomes 22Vac+22Vac

Your 63V capacitors are a waste of resources for an amplifier that cannot operate above 42Vdc.
25V, 35V & 40V capacitors can be used with chipamps, if you ensure your worst case operating voltage is below the maximum for the capacitor you choose.
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Old 14th December 2012, 12:01 PM   #145
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Thank you Andrew. I think i will start with a 15Vac+15Vac at first to be on the safe side since I intend to do bi-amping.
My tweeters are of 4 Ohms.

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P.S. I just found an old 12-0-12 @ 4 amp
I might use that as a test
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Old 29th January 2013, 11:08 PM   #146
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Can I somehow re-modefy the schematic for 40W max out? My speakers are bass=60w, mid=50w and high=50w. I don't want to damage them, and what power would i need to use then? Thanks for the reply.
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Old 30th January 2013, 01:19 AM   #147
kumori is offline kumori  Europe
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Quote:
Originally Posted by LazaKamikaza View Post
Can I somehow re-modefy the schematic for 40W max out? My speakers are bass=60w, mid=50w and high=50w. I don't want to damage them, and what power would i need to use then? Thanks for the reply.
There is no need for this. The speakers draw as much current as they need.
You can install a 1000W amp at this speaker and - provided you donīt listen TOO loud, the speakers will be fine. The amps power rating only means the maximum available power, not the one that is used on (normal ) listening levels.

In my opinion, more power recources from the amp are never a bad idea.

However, if you know the impedance of your speakers, you can check the datasheet of the LM3886 and reduce the transformer voltage (and consequently the operating voltage of the chip). So with a given voltage, you only get a certain maximum output power.

But again, I would rather try to maximise the output power for a given speaker impedance, meaning about 20V-22V Transformers for 4 Ohm speakers and about 25V-27V (?) volt ones for 8 Ohm speakers.
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Old 13th February 2013, 04:41 PM   #148
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my LM3886
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Old 15th April 2013, 08:33 PM   #149
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Originally Posted by shravanth View Post
my LM3886
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Nice work
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Old 17th April 2013, 01:32 AM   #150
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excelent
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