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jeepy 25th April 2012 05:16 PM

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!

stridervvv 25th April 2012 08:38 PM

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

jeepy 26th April 2012 05:47 AM

Quote:

Originally Posted by stridervvv (Post 3000954)
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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