Hall-Effect pots...

[RayS]

Over the past few months one of my throttle pots has been steadily going south, on occasion even noisy enough to red-line the engine and then I'm dealing with a total engine loss at 19,000ft.

Finally took advantage of some downtime this weekend to install hall-effect pots on the throttles. World of difference! Cleaned up some slop in the throttle linkage, put everything back together and it's like my 1900D just rolled out of the hangar with 2 brand new P&W turbo-props.

As always though, be careful wiring these things up. I discovered 2 seemingly identical datasheets that show VCC and GND reversed. (I of course chose the wrong datasheet to work from.) These things are fairly resilient to incorrect wiring, so no harm done after correcting the wiring.
 

[matta757]

What model hall-effect pots are you using? I'm using Vishay pots on my yoke and am getting a fair bit of noise, curious if the hall-effect ones would be better.

[RayS]

I'm using Clarostat:

HRS100SSAB180 (180 degree total turn radius)

&

HRS100SSAB090 (90 degree total turn radius)

Been using these for some time in my Yoke setup and just now got to installing them in the throttle quadrant. Zero noise.

[Trevor Hale]

Ray do they just connect to the same analog input as a regular pot?

Trev

[RayS]

They do Trevor, and they can hook up directly to the Bodnar cards. They're a drop-in replacement for regular pots. You do need to be careful about throw range. a linkage that forces the pot to travel farther than it's limit (90 or 180 degrees) will most likely ruin it.

Also, the 2 outer lugs are polarized so you have to make sure you connect +5vdc / GND to the correct lugs, otherwise your sim might smell funny. 

[Trevor Hale]

Thanks Bud, I hate it when the magic smoke comes out of these parts

[727737Nut]

Thanks Bud, I hate it when the magic smoke comes out of these parts

Especially when it's a 1600.00 chip

[Bob Reed]

Thanks Bud, I hate it when the magic smoke comes out of these parts

Especially when it's a 1600.00 chip

WHAT??!!!!

[Volante]

At www.mouser.com these units are listed at USD 31.12 a piece.