My limited knowledge of electronics allowed me to solve a 'problem' that I had with my sprinkler controller.
I wanted to run zones individually, but for some zones also wanted to run them together (in order to essentially have lower water pressure and throw the water to a different locations than what it would at full pressure).
So on the wiring to the controller I would, for example, wire the solenoid of one zone to the controller's zone1, and wire the solenoid of another zone to the controller's zone2 (There's a common wire that is also wired to the controller for all solenoids to complete a circuit). Then I would use two diodes to go from the zone1 wiring to zone3 on the controller, and from the zone2 to zone3.
Yay, it worked.
However, I noticed the solenoids were 'clicking' on any combined runs. I'm guessing this is due to a voltage drop? Is there a way for me to get the correct voltage to each solenoid?
EDIT: Here's a picture of what I did, very convulated to look at but, all I am doing is adding the diodes in at the controller, clearly I have no ide what I did :) I thought of the diode as a one way street, so when (in my example) zone3 is triggered the completed circuit (via the common wire - white) between zone1 and zone2, whereas when zone1 was triggered it would not go through the diode through zone3 and to zone2.
So the green wire(zone6) and yellow wire(zone5) go to zone3, so if I trigger zone3 they both go.
ADDED 2: I think I almost have it, but I feel like my problem is that I have this white common wire coming back from all the solenoid valves, which I can't isolate. In the first diagram I can get what I want (but that isolates every second wire to each solenoid, which I can't do without digging up the yard). On the other diagram with the second wire common, I get undesired current flowing half the time to the unintended valve.
Am I missing something obvious, or is there no way around having the second wires isolated?