Switch direction above X volts

[wireaudio]

Hello again everyone,

I have a little project im working on.



Basically i need R1 to be connected where it stands when voltage is under 25V otherwise i need R2 to be connected. (in other words, once or the other). I tried using a transistor (with a voltage divider) going towards R2 with gate activated from R1's line, and it works fine to activate R2, however, when R2 is activated i need R1 to be taken out. And that's where i'm stuck.

A relay is also out of the question because they don't last long and are pricy.

Anyone have any ideas?

Thanks in advance!

 

[MikeMl]

Since you want either 1K, or 18K, can you just always leave the 18K in the circuit, and then when the voltage is below 25V, parallel a 1059Ω resistor across the 18K?

(18000*1059)/(18000+1059) = 19062000/19059 = 1000.157Ω