Has anyone here driven peltier devices from a switching regulator? How much ripple would you expect to allow? Essentially I am looking to minimise the size of output capacitor on the regulator, so if >200mV ripple on 1.5V supply is permitted, that would be great. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist