Electronics > Projects, Designs, and Technical Stuff
3 switches, 7 lamps (no solid state)
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ebastler:

--- Quote from: Nusa on February 27, 2019, 10:13:34 pm ---Now take the next step and use switch 2 directly instead of using a relay. And if you decide to allow switch 3 to be 4pdt, you can eliminate all relays.

--- End quote ---

Of course. But the rules in the original post are pretty clear regarding the switches -- SPDT only.
There's room for interpretation regarding the relays.
Cyberdragon:

--- Quote from: Benta on February 27, 2019, 09:52:06 pm ---"DPDT relays allowed"
This is not what you originally wrote.  :--

In that case, 7 SPST for the lamps, and 2 DPDT relays for logic.

Edit: 7 SPST, not SPDT.

--- End quote ---

You misread, I said only the switches had to be spdt. I would have specified spdt relays, I just said relays. Though I should specify common relays, so no 7 pole nonesense.

EDIT: I don't think relays for each light are needed. Ebastlers circuit has switches 2 and 3 isolated so they could be low voltage while only switch one sees mains, allowing for the use of low voltage relay coils.
bsudbrink:
Sorry for the ugly drawing, I don't have access to a real tool right now...
Anyway, is there any reason this wouldn't work:
bsudbrink:
By the way, omit "L0" as required.
Benta:
On thinking a bit further, this can be reduced to two DPDT relays.

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