Using optocouplers and self-latching relays is another way to approach switching topologies. Attached is a pdf of a paper I wrote in the January 2007 issue of audioXpress. It is online at: http://www.audioxpress.com/magsdirx/ax/ ... /index.htm then scroll down to 1/07; Low Level Analog Switching.
Dennis
Opto-Coupled Self-Latching Relays
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Opto-Coupled Self-Latching Relays
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