Well, I thought that those diodes "clamp" the voltage to 1.8V and won't let anything more than that go to your sound card even if it is much higher than the 25:1 ratio.
edit: but then clipping will occur and you won't see anytihng that is higher than 1.8V. so basically this setup will work for anything that fits in the 25:1 ratio. If you want to use it for anything that won't fit, just use a 50K resistor in place of the 24K and then your ratio will be 50:1 You could put all this in a small plastic box and have a common ground but several inputs with different ratios. Don't worry about the wattage because your input impedance is so high that those resistors will get very little current. Just pick a couple of resistors that you think will fit the voltage ranges for your different amps and just connect them to the point between R1 and R2. Then use the other ends for your input.
edit: but then clipping will occur and you won't see anytihng that is higher than 1.8V. so basically this setup will work for anything that fits in the 25:1 ratio. If you want to use it for anything that won't fit, just use a 50K resistor in place of the 24K and then your ratio will be 50:1 You could put all this in a small plastic box and have a common ground but several inputs with different ratios. Don't worry about the wattage because your input impedance is so high that those resistors will get very little current. Just pick a couple of resistors that you think will fit the voltage ranges for your different amps and just connect them to the point between R1 and R2. Then use the other ends for your input.
Comment