[Amps] diodes for motor driven vacuum variable

[Larry Benko]

Jim,

Let's assume for a minute that there are only 2 diodes and the 3rd one 
is maybe something like a zener as only 2 diodes are needed for the 
usual limit switch circuitry.  Also I am assuming that the motor is a DC 
motor.  The diodes connected to the limit switches handle the full motor 
current and need to have reverse voltage greater than the DC motor 
supply.  That is it.   Do a search for DC motor limit switch circuit for 
lots of examples.

Larry, W0QE



On 8/25/2012 9:27 PM, Jim Hoge wrote:
> Hi all,
>
> I have a vacuum variable driven by a 28v motor. Perhaps the assembly had come out of some Harris equipment, it certainly looks Mil Spec. As part of the limit switch assembly, there are 3 diodes, marked TJ4245AKK (maybe TJ4245AXX, the printing isn't real clear.) Anyway, here's the question: Does anyone have the data sheet for these? I need to know what to replace them with as one let the magic smoke out and another is broken. I can run the motor without the limit switches but I would like to keep that feature. BTW, I will be running it on 12 V.
>
> Tnx,
> Jim W5QM
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