Hello, We have a portable gadget that uses a PIC16F873 and consumes about 100mA. It could not go to sleep mode. I'm currently using a 9V batery with a 78L05, but the waste of energy is very high. What do you suggest? A switching regulator I could simply put in place of a 78L05 would be super. Thanks, Brusque +------------------------+ | Edson Brusque | | Research & Development | | www.citronics.com.br | +------------------------+