On Jun 28, 2008, at 5:19 AM, Tom=E1s =D3 h=C9ilidhe wrote: > therefore I don't see why you think I'll lose an entire volt in the > lowside driver. We analyzed darlingtons in EE class. The second transistor never gets into saturation and has Vce much higher than Vce(sat); I forget the exact reasons, and I remember being rather ... stunned. Also, I read the ULN2803 spec sheet... BillW -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist