For just soundcard input protection (not level matching, etc.), you only need a few diodes and resistors like Pete Millet used on his soundcard measurement board.
Yes, a resistor/lamp and PSU/battery biased diodes that is what 1audio proposed too. It still requires + and - bias voltage for diodes.
stratus46 has proposed a "self biased" multiple diode clamping that does not require + and - PSU/battery voltages. My SPICE simulations shows it works.
I am not sure to what degree SPICE is correct.
Probably it was something wrong with simulations. I've redone the simulations of battery biased and multiple diode clampings. The battery biased shows much less THD with nominal signal level (1.7Vpk).
So, it is way to go. I am not sure if I will be able to find LI batteries of 0.5V and 1.5V or 2V to use for Consumer and Pro biasing. Probably I will have to get required V from PSU that will require to add some more rectifiers and RC filtration and to replace PSU umbilical.
So, it is way to go. I am not sure if I will be able to find LI batteries of 0.5V and 1.5V or 2V to use for Consumer and Pro biasing. Probably I will have to get required V from PSU that will require to add some more rectifiers and RC filtration and to replace PSU umbilical.
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