Electronics > Beginners

Switch wiring id driving me nuts

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AngraMelo:
Hello guys, I have the attached schematic and I´m about to wire the switch. What I have is a 12 position selector switch. It has a common pin that is then connected to the other 12 pins (one at a time) as you rotate it.
I have no idea how to wire it by following the schematic. I dont know if I need 2 switchs or if I need to brigde the contacts.
Can someone please help me?

piguy101:
It looks like to me that the switch is a double pole, five throw switch (DP5T). Is it something like this? 1825080-4 from TE https://www.digikey.com/products/en?keywords=450-2422-ND

Or is it more like a rotary switch, or something else?

AngraMelo:
Hello friend,
it is a rotary switch. here is the video of the guy making this project

rstofer:
Like this:
https://www.digikey.com/product-detail/en/c-k/A20503RNZQK/CKN10620-ND/3752049

Brumby:
It's a double pole 5 position switch.  Each bank has 5 positions and they are labelled SW1-A and SW1-B - which is interpreted as Switch 1, bank A and Switch 1, bank B.  Each bank is electrically isolated from each other, but are operated together through a common mechanical movement.

You can have it in a linear arrangement or rotary.  Rotary is the most common in my experience.

There are many ways to build a rotary switch - so I'm not going to try to describe more than just this one style....

A common style is a single wafer with 12 contacts spaced at 30º around the perimeter.  Inside this ring, there are (typically) 1, 2, 3 or 4 other contacts.  All these are fixed in relation to the body of the switch.  Mounted to the shaft is a switching plate that will have 1, 2, 3 or 4 pairs of wipers.

You can get them with PCB pin or eyelet terminations:
     

The configurations possible are, respectively, 1 pole, 12 position; 2 pole, 6 position; 3 pole, 4 position and 4 pole, 3 position.  This is the general construction - you buy your switch in one of those configurations.



There is usually a mechanical stop at each end of the rotation movement so you know when you've reached the first and the last position - but you can also buy a switch that has these mechanical stops placed differently.  This means what looks like a 2 pole 6 position switch can have a stop after the 5th position - so it pays to check how many positions a switch actually has before soldering it in.

Edit: Spelling

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