I am working on a circuit that allows someone to select between using a pullup resistor or a pulldown resistor by switching a dip switch mounted on a pcb. Sounds simple enough but I am unable to locate a dip switch. I've found tri-state switches but I don't want the middle state. I basically want a single pole double throw with a common pole. I am looking for a 10 position switch. Maybe I'm missing an easier way of doing this...

I need this configuration in this package

 

I am working on a circuit that allows someone to select between using a pullup resistor or a pulldown resistor by switching a dip switch mounted on a pcb. Sounds simple enough but I am unable to locate a dip switch. I've found tri-state switches but I don't want the middle state. I basically want a single pole double throw with a common pole. I am looking for a 10 position switch. Maybe I'm missing an easier way of doing this...

View attachment 124141 I need this configuration in this package View attachment 124142

Those DIL switches are common enough as just simple on off switches - If they exist; you'll only get half as many DPDT switches per block length.

Using both pull up and pull down isn't very common - if its CMOS; I'd go for 100k static pull resistors and oppose them with switched 2k2 resistors to pull the other way.

 

When you switch between pullup and pulldown, are all 10 independent or ganged?

Don't think you're going to find a single DIP switch that will do it.

 

Hello,

There are a couple mentioned on this page:
http://www.grayhill.com/products/dip-switches/

Bertus

 

You can get them in miniature singles, take up a little more real estate!
https://picclick.com/MSSA104D-1-Alco-Slide-Switch-Single-Pole-Double-Throw-201552533664.html
Max.

 

If you go for DIP switches, make sure you specify the contacts correctly. Grayhill has two typs of SPDT:

 

Guess I'll just stick with using a tri-state dip switch.

 

Maybe I'm missing an easier way of doing this...

If you answer my question regarding whether the pullup/down switching can be independent or ganged, we might be able to come up with alternate solutions.

A schematic is always helpful when discussing circuit issues.

 

Sorry, they are all independent of each other.

 

Sorry, they are all independent of each other.

If you want all to change at the same time - it might be easier to use 2 rows of strobed buffer gates.

 

Sorry, they are all independent of each other.

The Grayhill 78 series switches are available in 1-5 switches per package.

Another option is to use male headers and use shorting blocks to configure.

 

Just go with 3-pin headers. They take up the least amount of space.