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Old 10th February 2004, 08:11 AM   #1
Dxvideo is offline Dxvideo  Turkey
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Default Live!Value's Output Level?

Does anyone know that? In fact the real question is; Do I need a preamplifier to drive a TDA2052 gainclone with Sound Blaster Live!Value? Without a preamp does TDA2052 give real 40W?

Thanks in advance..
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Old 10th February 2004, 03:36 PM   #2
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I can get about .9V rms out of my SB live, and I'm sure you would be somewhere around there too.

I would think thatís plenty to drive an amp.
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Old 10th February 2004, 08:56 PM   #3
GregGC is offline GregGC  Canada
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You can calculate how much in volts you need based on the gain of your amp and the load impedance.

Vout=sqr(P*Rload)
Vin=Vout/A
A is the AC voltage gain of the amp. (Rf/Rg)

For example:
P=40W and Rload=8Ohm
Vout=17.9V
for a gain of 22
Vin=0.813V
It means that the amp with 0.9 V from the SB will drive the speaker to a little more than 40W
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Old 11th February 2004, 07:21 AM   #4
Dxvideo is offline Dxvideo  Turkey
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My TDA2052 gainclone's gain is 22K/680ohm.. So you say its enough?

Thanks
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Old 11th February 2004, 02:30 PM   #5
GregGC is offline GregGC  Canada
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Quote:
Originally posted by Dxvideo
My TDA2052 gainclone's gain is 22K/680ohm.. So you say its enough?

Thanks

More than you need:

gain: 22k/.68k=32
Vout= 32x0.9=29Vac
Pout=29x29/8=100W
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Old 12th February 2004, 07:00 AM   #6
Dxvideo is offline Dxvideo  Turkey
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I see.. Thanks a lot.
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