antoniasse wrote: > PWM will be fine.. For some value of "fine" perhaps. PWM is not such a great way to control Peltier coolers. As I said before, running a Peltier cooler at 50% duty cycle full on takes significantly more power than running it at the DC current required to get the same cooling power. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .