Jason wrote: > So I need no resistor on my delicate microcontroller ? wrong ! > About 2 weeks ago I thought that might be true. I tried it on > one of my chips , it released it's magical smoke and burned up Instead of 2000 people on this list guessing at what you mean, maybe you should provide a detailed description of the circuit or a schematic drawing of same. You do not need a resistor on the supply or ground rails of a microcontroller. You may or may not need a resistor on other pins -- either input or output. Frequently you need way more than a single resistor -- either multiple resistors, capacitors, inductors, other active components (i.e. transistors, etc). No one here can advise what you need unless you tell us what you are trying to do. On Sat, Apr 24, 2010 at 5:07 PM, Rich wrote: >> A device will only draw what it is rated for. If you have a >> device that is rated for 5 volts at 5 mA and you connect it to >> a source that is rated for 5 volts at 1000 mA your device will >> only draw 5 mA because of its load impedance. One cannot push >> current through a device; a device draws current according to >> its load impedance. Rich's statement is correct. This statement would generally refer to the Vdd (5V supply rail) on a microcontroller. If you don't believe it, then you need to learn more about basic electronic circuit theory. Lee Jones -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist