You might want to consider pulling the PCB out of the servo and extending the
motor and pot leads.  I don't know that any electronic components you put in tha
t
temperature will last long.

BTW, you can also put a high power H bridge after the motor drive electronics an
d
use a big motor if you ever needed to.

You can also make your own driver board with a PIC to keep this relevant.  The
signal going to the servo is just a duty cycle modulated square wave.

Jon Petty wrote:

> Hi
>
> I have an application where I am using RC servos (Airtronics 94102) in hi
> temp areas 150-175 deg F.
> The servos are failing (duh!). I would like to replace the servo ic's with
> higher temp versions. The first problem is Airtronics uses a custom
> mitsubishi ic (#M51791AL) that I cannot get. It looks like there are a couple
> of transistors (I think) labeled #8561.
>
> Does anyone know of replacement servo ic parts or a servo board schematic to
> build my own servo board?
>
> Anyone know of hi-temp servos?
>
> The housing is machined aluminum especially for the airtronics servo, I would
> like to find a way to modify the servos rather then replace.
>
> Thanks
>
> Jon