On Sun, 17 May 2009 19:55:34 -0400, Michael B Allen wrote: > That's what I ended up doing. I wanted to see if I could get it to work > with one battery but it seems doing a virtual ground with two resistors > is not as simple as I thought.
This is how I fabricate symmetric +/- voltages from a single supply: http://bibo.iqo.uni-hannover.de/dokuwiki/lib/exe/fetch.php?media=eigenbau:pd-ac:pd-ac_v2_schematic.pdf If you need more than 20 mA current on the rails the OP07 may be replaced by a power opamp like TDA2030. ---<(kaimartin)>--- -- Kai-Martin Knaak http://lilalaser.de/blog _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
