Quote:
terrym wrote:
 Hope this isn't too dumb a question but could we not use the microphone inputs on our laptops by placing a 40dB pad (and possibly a capacitor to block DC if bias in present on plug) in between the RS meter and the mic input? |
I did some loopback measurements on a laptop mic input a while back with a suitable attenuator in the loop, aside from the high noise floor Bruce mentioned (less than 40dB S/N) the frequency range was also restricted at both the top and bottom ends. Only tried that one, so others may be better - can't hurt to try a soundcard measurement with the pad in the loop and see how it comes out. If you do try connecting an RS meter you will need the blocking cap else the mic input's 5V bias output pegs the RS meter to the end of its scale.