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Old 25th April 2012, 05:16 PM   #1
jeepy is offline jeepy  Switzerland
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Default TPA6120 power supply?

Hello, what will I miss if I use a +/- 10 V regulated PSU instead of 12-15V as suggested sometimes, to be used with a 70 ohms/120dB headphone? Thanks!
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Old 25th April 2012, 08:38 PM   #2
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your spl=120db per 1mW
P=I*I*R=IU=U*U/R
your amp must give : I=0,003779~0,004A=4mA(for 120db peak)
U=0,004mA*70Ohm=0,28V(for 120db peak)
with +/-10V amp can give ~ 6,5/7V of signal.
But you need only ~0,3V(for 120db peak)
for 120db rms you need U=0,3*1,4=0,42V => you can easy use +/-10V

Last edited by stridervvv; 25th April 2012 at 08:46 PM.
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Old 26th April 2012, 05:47 AM   #3
jeepy is offline jeepy  Switzerland
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Join Date: Feb 2010
Quote:
Originally Posted by stridervvv View Post
your spl=120db per 1mW
P=I*I*R=IU=U*U/R
your amp must give : I=0,003779~0,004A=4mA(for 120db peak)
U=0,004mA*70Ohm=0,28V(for 120db peak)
with +/-10V amp can give ~ 6,5/7V of signal.
But you need only ~0,3V(for 120db peak)
for 120db rms you need U=0,3*1,4=0,42V => you can easy use +/-10V
Wonderful. Thank you!
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