Hi All

I want to replace some old legacy analog pots with modern digital pot(chips) such as the microchip MCP4xxx range.
This ‎will then allow me to control the pot values from a remote panel or external control equipment.

Some of the original pots are high values like 250k, 500k and even 2meg, but i see that digital pots are 'upto' 100kohms, but mainly 10k or 50k are more popular.

So, is there a sneaky way i can add an external resistor network to effectivly change a 50k digipot into a 500k pot as 'seen' by the existing circuit????

I remember years ago seeing an article about changing log into linear pots (and/or vica versa) by adding a few additional resistors, so i wonder if a similar method can extend the range of a digpots total resistance????


Thanks in advance,
Marty.