chrisaus2009
New Member
I want to be able to control a hydraullic valve I have where I have two sources, one is from my PLC (variable voltage -10 to +10V), one is a constant +24V DC supply from a switch mode PSU I have. The hydraullic valve sits at rest with +12V, spins one way at +7V and the other at +17V, I have made this circuit **broken link removed**
the circuit does exactly what I want, the only problem is I want to be able to isolate the PLC from the +24V supply so either terminal (common/supply) on the PLC doesn't see more than 10V, otherwise it will cook the PLC. Is there any way to do this without using transistors and without using a POT (even though there's one in there for simulation purposes)? So that the circuit is ONLY controlled by the variable PLC voltage +/-10V (linearly).
Thanks
the circuit does exactly what I want, the only problem is I want to be able to isolate the PLC from the +24V supply so either terminal (common/supply) on the PLC doesn't see more than 10V, otherwise it will cook the PLC. Is there any way to do this without using transistors and without using a POT (even though there's one in there for simulation purposes)? So that the circuit is ONLY controlled by the variable PLC voltage +/-10V (linearly).
Thanks