Does anyone have a formula for calculating the distributed capacitance of copper planes? I Know I have seen this before in PCD magazine but I seem to have *lost* the issue. Thanks in advance for your assistance. Jeffrey McGlaughlin BFGoodrich Avionics Systems Inc. 1105 Schrock Road Suite 800 Columbus Ohio 43229 (614)825-2232 (voice) (614)825-2037 (fax) [log in to unmask]