If all the LEDs draw the same current there is a very simple way to detect a third being switched on by looking at the current they draw
To me personally it makes no sense.for easily understanding only i told its LED but the concept is Solenoid Valves...
I assume: R19 isn´t correctly calculatedI am getting only 15V AC across 24V load. Why ? I should get 24V AC across load (lamp).
Please verify it again. 1k = 10 x 10k in parallel. The simulation should show the same result.Are you telling that I have to replace all 10k resistors in switch circuit with one 10k resistor ? That didn't work for me.
The value is "true RMS"?but still getting only 20V across load
Only one opto if a single triac is needed to cut the supply -or- one relay to do the same thing.Explain the working of your circuit. How many relays or optos it have ?
The solenoids are turned on by the switches themselves, there is no control circuit to the solenoids.How do you turn ON individual solenoids with one relay or opto ?
Yes, the original specification calls for 10 switches. I did not show how to turn off the main supply, it can be by one triac or a relay. Relay is easiest.Do you have 10x SPDT switches ? The main single 12V relay cuts of the 24V power supply if more than three switches not connected to op-amp circuit ?
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