John, Ah, now I understand. Stud mounting diodes can be either stud anode or stud cathode - if you stuck with the same diode you would have been OK. I was talking about the diode symbol where the forward pointing arrow (the pointy bit!) touches the vertical bar which is the cathode (+) and what I would attach to the battery end. Cheers Peter On Wednesday, March 30, 2005 4:30 PM, John Rippengal [SMTP:j.rippengal@xxxxxxxxxxxxxx] wrote: > Rich, > I'm 100 percent with you on the current flow from anode to cathode BUT "the > cathode is at the pointy end"??????? > > The picture I have of the diodes I mounted in the system I constructed is of > a top hat shape. The top of the hat has a terminal - the pointy end?. The > bottom of the hat - the brim sort of - has a mounting screw. You fix the > brim to a heat sink using a mica washer etc and a nut on the screw. (The > mica is because the heat sink could well be earthed). With my diodes the > pointy bit was the anode and the base/brim was the cathode. I thought they > were all made that way? > > Anyway my aeroplane flew for 13 years and charged its batteries ok with them > wired that way. > > John > > From: "R.L. Roebuck" <rlr20@xxxxxxxxxxxxx> > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.