Re: That's all it is

Re: That's all it is - except

Posted by Larry Jenkins on Sep. 13, 1998 at 16:32:41

In Reply to: That's all it is - except
posted by Bob Carabbio on September 13, 1998 at 02:17:15

: That you do need to heat-sink the diode.
: The Cathode of the diode is connected to the generator terminal, and the Anode is hooked to the battery.
: Since a Silicon diode drops about .6 - .8 volts in the forward direction when it's conducting, it produces heat - with a 10 amp charge, that's 8 watts which would be in dangerous territory for a top-hat unit supported only by leads inside the cutout can. Not a problem, most likely for the occasional parade, but if you drive a lot, and at night with the generator set accordingly it could lead to trouble.
: If you're going to do it yourself, use a stud-mount diode, and mount the diode directly to the cutout base using a mica insulator AND Heat sink compound (not dielectric grease) between the diode and the metal of the base unit.Radio Shack most likely has everything you'll need.
Hi guys..
I seem to recall when the diode conversion appeared on the scene, and there was controversy regarding the one to use, and the collective opinion was that the diode to use is the Motorola HEP 151 as it was the original and seemed to have all the characteristics to make it work well.Not an electrical person, just seemed to recall that plus I used the HEP 151 in my first Model A with no problems at all.
Larry Jenkins

Follow Ups:
more diode stuff Bill Sep. 13, 1998 at 17:10:58(0)

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