Rudy Wieser wrote: > By the way : You can throw away Q1, Q2, R1 and R2 because you only need to > have the MCLR pin at Zero and +12.5 volts. +5 Volts is only required when > _running_. And you don't want that to happen when programming, do you ? I thought that the AN589 had a bit of the "in circuit programming" philosophy behind it - which is why you can turn off all three transistors and let /bar MCLR just be pulled to +5V along with the power pin. Thanks for the replies; I'll get to testing those possibilities soon. Andrius