[sdiy] Rotary Switch Needed

[Don Tillman]

   > From: "john mahoney" <jmahoney at gate.net>
   > Date: Fri, 19 Dec 2003 14:13:12 -0500
   > 
   > I don't think this can be done with a DPDT switch. 

Oh sure it can...

   > Series wiring requires a link from one speaker's negative
   > terminal to the other speaker's positive terminal, but this can
   > not be hardwired because it must NOT be present when running in
   > parallel mode. You can't wire that link into a DP switch.

You just have to be more creative.  Here's one way:

 pos input to speaker1-pos and to switch1-parallel
 neg input to speaker2-neg and to switch2-wiper
 speaker1-neg to switch1-series and to switch2-parallel
 speaker2-pos to switch1-wiper
 switch2-series is left unconnected

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com