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| Audio Amplifier |
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| Audioguru:
Whoever told you that 7V is not loud enough and it must be amplified to 10V never tried it and does not understand that our hearing 's sensitivity to loudness is logarithmic. 10 times the power sounds only twice as loud. Maybe the 7V must be reduced to 3V to avoid clipping in the other intercom amplifiers. |
| staticshock:
Well I've just been updated with more information and the input is NOT 7Vrms, but it is 0.7Vrms. I don't think it poses any major issues other than changing resistors???? Also is it better to keep the op amps as non-inverting or change to inverting? I'm also having trouble finding an Automatic Gain Control (AGC) chip that will fit with the existing circuit. |
| HB9EVI:
Well 7Vrms or 0,7Vrms is some difference; for the OPA is just a matter of the dividers, you're right there. If inverting or non-inverting might depend on the output impedance of your 0.7Vrms; if it's low-Z it's possible to use an inverting opamp, if it's hi-Z you rather go for the non-inverting since it has high impedance input. Why do you need an AGC? |
| staticshock:
My senior acquaintance suggested it. I'm assuming for the same reasons as in Radio applications: want the output to be constant no matter what the input is. (It's not a requirement, but could it be beneficial to my circuit?) |
| HB9EVI:
hmm, well an AGC is on the receiver side of a transmission, its existance is owed to the fact of signal fading and other influences on the signal in the transmission path. on the sender side signal conditioning is normally done with a compressor; I wouldn't bother to build that discrete but rather go for a ready product like the SSM2166 |
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