On 11/10/10 06:11, nev young wrote:
So assuming that you want to connect a line-out on one machine (probably not a computer) to the mic-in on the laptop all you need is a simple attenuator.
IIRC, the line out gives 1 volt pp and expects a 100Ω load and the mic in expects 100 mvolt pp from a 10KΩ source.
So a few resistors from the junk box[1] should do the trick.
ISTR that the mic input on most laptops expects a Electret microphone with a built in preamp FET and therefore has a DC Bias (phantom power) you'd want to decouple your Line input from.
So a more suitable circuit would look something like
Line in ---C1-------R1---+---Mic Output | R2 | Ground-------------------+---Ground
(apologies in advance if mail formatting messes up my fine ascii art)