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
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|