alan smith wrote: > OK audio guys..... > > I have an amplifier that can deliver up to 50W of audio per channel, and > need to switch on and off differnent channels outputs depending on some > control inputs. I was thinking of relays but that rather a large real > estate usage, so wondering about just using some of those small solid > state photoMOS relays, like those used in telco applications. > > Its a one-off project, so production costs aren't of a real issue other > than I do want to keep costs down of course. Is there a question in there somewhere? Keep in mind that 50W at 8 ohms is 2.5 A rms. The little photo-mos relays are usually only good for a few hundred mA. A larger SSR will probably have significant distortion on the zero crossings. -- Dave Tweed -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist