Good Octal Rotary switches...

[Govmnt_Lacky]

I have been looking for a good panel mount OCTAL rotary switch for quite some time. Anyone know where I can get one?

[Govmnt_Lacky]

Anyone? Any ideas or leads? 

[davent]

Not sure what you mean by an OCTAL switch. 1×8, 2×8? Could you clarify that?

dave

[Govmnt_Lacky]

Not sure what you mean by an OCTAL switch. 1×8, 2×8? Could you clarify that?

dave

A panel mount switch with 3 inputs and 3 outputs that operates in an Octal format. Like this one but something I can put a knob on and mount into an enclosure.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=GH7264-ND

This might work however, I would like something a bit more hearty.

They might also be called Rotary Octal DIP Switches.

[Govmnt_Lacky]

Ok. Maybe it might help to give a little back story.

I have an FV-1 circuit. I want to be able to cycle through the 8 preset channels in the chip. These channels are based on a binary/octal format (i.e. 3 input pins S0, S1, and S2 and they operate on an octal format 0-7)

So... Is there a panel mount rotary switch that would allow me to switch between presets?

[octfrank]

Check with Grayhill http://www.grayhill.com/, they make lots of different encoders. Also you could use a SP8T, pull up resistors and a 74HC148 to make an encoder (see schematic in pdf at http://www.oct-distribution.com/datasheets/SKRM-C8-R02.pdf ) this allows you to use a real heavy duty switch if necessary and is cheap to implement.

[PRR]

"OCTAL" is the base on old vacuum tubes.

Yes, my father wrote octal-code for computers, but hex became stylish.

You "can" put a knob on the extended actuator binary-code switches. Get some 1/8" ID rubber hose. Get a 1/4" bushing and shaft and turn the end down to 1/8". Make some brackets and such.

OR......

Get plain 1P8T switch, use diode-logic to make bit-code.



If I remember kindergarden-logic:

Pos 1, no diodes, S0 S1 S2 all low.
Pos 2, diode pulls S0 high, S1 S2 stay low.
Pos 3, S0 low, diode pulls S1 high, S2 stays low.
Pos 4, diodes pulls S0 and S1 high, S2 stays low.
....etc.... you work it out.

Looking at OCT Frank's plan..... hmmmmm, the logic may want to be inverted. Though maybe not. We use all 8 possible combinations of 3 bits. Worst can happen is effects 0..7 happen 7..0 on the knob, and is that a disaster? And won't swapping 2 wires fix that?

Is a '148 chip and a resistor-pack cheaper or easier than a pinch of diodes and three orange-stripe resistors? If you have a 100-bag of little diodes but a '148 chip is a $20 shipping charge away, the answer is easy. If you will make a million, you need a sharp pencil to figure the fractional-cents; OCT is probably right that MASS-production favors not dinking with the diodes, probably adds a penny in assembly-robot charges.