I wish to replace the zener diodes with a programmable chip, so that I can program the chip to do exactly what the zener diodes do in this circuit. This will then make the circuit universal to all my applications, and all I would need to do is reprogram the chip to use it on an application that requires different voltage limitations. In this circuit (if you need to simulate it and play with the POT's and the push to make switch to understand it, do so) they are voltage limiters, limiting either the minimum voltage d2, or limiting the maximum voltage d1 & d6.
Please read this carefully before testing. POT's R1 & R2 are attached to the same wiper, so what happens to one must happen to the other. The switch SW1 is a push to break switch.
simulate this circuit – Schematic created using CircuitLab
Best Answer
in-fact you could probably simulate the whole circuit in software and drive the two meters with PWM signals from the pic.