Mike Keitz wrote: > > >Use a Dallas serial LOG pot! > > Exactly the answer the original poster has already removed from > consideration, due to the peculiar demands of the "hi-fi" set. Using a > semiconductor switch in the signal path can and does produce distortion, > but with some of the newer parts such a small degree that no one would > notice it. There are many people who think they can notice it though. How about having relays AND a Dallas log pot? Use the IC for the audio path, and have your PIC control the relays at the same time as setting the pot. The relays would therefore give 'audio feedback' to the hiphilite. The relays should probably be mounted on the PCB in such a way as to maximize the clicking sound level outside of the box, and also in a way that looks as if it is really involved in switching the audio to anyone opening the box 'just to have a look'. Frank ------------------------------------------------------------------------ Frank A. Vorstenbosch Phone: 0181 - 636 3000 Electronics and Software Engineer Mobile: 0976 - 430 569 Eidos Technologies Ltd., Wimbledon, London Email: fav@eidos.co.uk