I am wiring a landing lear operating circuit for a 3/4 scale P-51 aircraft. The landing gear is operated by an electrically driven hydraulic pump. The pump has solenoid which powers a valve in parallel with it. The circuit is protected with a 20 amp c.b. I seem to remember using a zener diode to protect the micro switches from fly-back of the inductive loads when power is removed.
Do I merely place the banded end of the diode towards the powered circuit and the unbanded end at ground, or do I have the orientation backwards. Also do I need to put a resistor in series with the diode?
Do I merely place the banded end of the diode towards the powered circuit and the unbanded end at ground, or do I have the orientation backwards. Also do I need to put a resistor in series with the diode?