Multi circuit switch

I'm sure everyone on here has seen a million post on switches but this is a bit different... maybe. I need a switch that has 3 positions on-off-on. I have seen these. The only thing is I need it with multiple circuits. I don't know how to explain it, but I think I need something different. More like 4 pins instead of 3. Im very new to the DIY scene so if this is a absolutely stupid question let me know. I'm sure I'll have more to come! lol

Picture of Multi circuit switch
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Jackhole8 years ago
Couldn't you just make the middle pins on a 3 pin Switch the common ground?
Foreverhex (author)  Jackhole8 years ago
I don't know if that would work, unless you could use the two red cords to attach to the middle. Like both of then soldered on one pin. I don't know if the chip would freak out about that.
NachoMahma8 years ago
. I think you're looking for a DPDT switch. Wikipedia's entry for Switch may help.
. Something like this TOGGLE SWITCH HD DPDT (CENTER OFF) ON-OFF-ON 20A / 125V on EBay (not a recommendation, just the first one I found).
Foreverhex (author)  NachoMahma8 years ago
Thanks! That sent me on the right track. The DPDT normally don't have a center off. But with the wiki page you sent me there was a type under it called DPCO. Which is the same a DPDT but with a center off. Exactly what I needed! Thanks! While I have your attention, do you know anything about rotary switches?
rotary switches can switch a TON of contacts at once, like those switches for the parallel port on you computer (buy it at a thrift store for like 50 cents) can switch 25 individual switches to 4 positions
Foreverhex (author)  guyfrom7up8 years ago
Yeah I've seen pictures of the switch and they look awesome. What do you mean the switches for a parallel port? I've never seen one... I've seen a parallel port (printers) but not a switch.
. Back when parallel printers were the norm, computers were much more expensive, and networking was still for the big boys only, the switches were used to run multiple printers from a single computer.
I use mine for devices that are supposed to be "pass thru" but don't quite work that way, my scanner is parallel port and the printer can hook up at the scanner, but then either the scanner or the printer would act up at weird times. Got 2-position switch, then I just select which I'm using. Actually used that switch before getting the scanner, back then I had a parallel port backup tape drive, switched between that and printer.