200 ohm D.P

[Torkemada]

Hello !

I want to make a mod with OKR-t module and i want to replace 200 ohm mecanical trimmer with digital one.
Unfortunately I have not found one yet.
Does anyone have idea where to find ?

 

[breaktru]

yes and no, unfortunately the mod police frown on directing to another site where I have the solution. Sorry
The mod you see in my avatar has one.

 

[Torkemada]

i find it and read all your posts....18ohm with PD 10k
THX

 

[breaktru]

There is an update on it.

Note on Parallel resistor for pot wiper - The way I have the 18 ohm across the 10k D.P. wiper will effect the Linearity of the pot making fine adjustments impossible as voltage stepping are large jumps. It is very hard to adjust with a 1s6s DM because you have to wait for the pulsing display and a little more practical to adjust w/ a multi-meter. Several attempts maybe be needed to find your desired target voltage.
See graph image below.
To calculate your own values see: Parallel Resitor - Pot Graph

Just found this but haven't tried it yet:
Tricking a pot to be Linear w/ parallel resistor see: See Linear and Taper Pot Link

See the images: Parallel resistor / Pot

 

[Str8V8ping]

My CYprus mod is using the same digital pot as Breaktru's

 

[Torkemada]

This DP work well with 4050