On 2009-09-01, Ignoramus15363 wrote:
On 2009-09-01, Gunner Asch wrote:
On 1 Sep 2009 06:09:17 GMT, "DoN. Nichols" wrote:


[ ... ]

Typical pot is a 5K or 10K linear pot with a 2W power rating.

As for the switch -- make it a SPDTCO (Single Pole Single Throws

Did you mean double throw?

Yes, I did.

Got a source for those?

For the usual ones -- try Mouser, Digi-Key, and the other
electronic suppliers.

For the locking handle ones -- those I stumble across at
hamfests -- occasionally.

O.K. Mouser Electronics has them -- but not cheap. Look at:

http://www.mouser.com/ProductDetail/Honeywell/2TL1-1A/?qs=sGAEpiMZZMtygI3JAGOxU%2f5ZR3DSiS2Q

assuming that still reaches it. If not. look for Mouser part number
785-2TL1-1A (A Honeywell switch -- about $40.00 in unit quantities.

The one shown has to have the handle pulled to switch from any
position to any position. There are some which will switch to one side
only without pulling, and the other side requires pulling. Others can
be switched from either "ON" position to the center "OFF" position, but
must be pulled to switch to either "ON".

You deal with enough surplus stuff so once you know what they
look like, you can keep your eyes open for them. They are normally used
for things like activating munitions in an aircraft, where you don't
want someone to accidentally switch something explosive on. :-)

On eBay -- these look like possibilities:

300333989154

This one is lacking the center off, but it has a close-up which
shows how the locking works.

330259446730

But if you have to *buy* switches *new*, look for large
pushbuttons, with the locking mushroom switch for the panic stop
function. You can get those at places like Grainger, if you have the
ability to buy there.

Enjoy,
DoN.

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