Hello everyone. I've been using REW for quite some time and it's a very powerful software. I made my impedance measurement rig as described on the REW website and I used the headphone output and line input from my soundcard.
However, I'd like to use an amplifier to drive the speakers for more accurate results. The website says "If using a power amplifier the sense resistor can be much lower, 33 ohms or less, but the soundcard inputs should be connected via a resistive divider providing around 20dB of attenuation and ideally the inputs should also be protected by back-to-back zener diodes to clamp the input to less than 5V."
How do I pratically build that circuit? Does anyone have any schematics?
Thanks everyone!
However, I'd like to use an amplifier to drive the speakers for more accurate results. The website says "If using a power amplifier the sense resistor can be much lower, 33 ohms or less, but the soundcard inputs should be connected via a resistive divider providing around 20dB of attenuation and ideally the inputs should also be protected by back-to-back zener diodes to clamp the input to less than 5V."
How do I pratically build that circuit? Does anyone have any schematics?
Thanks everyone!