Witch amplitude on F5 entrance (calculation check)\ or preamp amplification for F5 - diyAudio
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Old 8th January 2014, 07:31 AM   #1
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Join Date: Dec 2009
Default Witch amplitude on F5 entrance (calculation check)\ or preamp amplification for F5

Hi
I just want to be sure about how much voltage I need in the F5 entrance for achieve max power to the speaker:

My PS produce +-30vdc, the F5 is 15db amplification so the amplification factor is 10^15/20=5.6.

Now if I want for example 25v on the speaker I need in the entrance Vin=25/5.6=4.5v.

if my DAC (audio source) produce 0.3v I need preamp with amplification factor of 4.5/0.3=15
Something like 20db
Please if I have some mistake or if I doing here something wrong tell me.
thanks
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Old 8th January 2014, 07:39 AM   #2
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Join Date: Apr 2008
A tip: if your DAC is commercial and not too old, it will put out 2VRMS or 5.6Vpp maximum.
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Old 8th January 2014, 07:44 AM   #3
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Join Date: Dec 2009
my DAC based on PCM2707:

http://www.ti.com/lit/ds/sles081f/sles081f.pdf

"DAC outputs through the headphone amplifier VOUTL and VOUTR can provide 12 mW at 32 Ω, as well as 1.8 VPP into a 10-kΩ load."

don't tell me that i don't need preamp !! i just order one

Last edited by erez1012; 8th January 2014 at 07:49 AM.
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