Re: Simple design - will it work

On Wed, 8 Jul 2009 13:03:11 +0100, "Jim" <jim@xxxxxxx> wrote:

Guys

I need to wire up a remote switch for a milling machine in my garage.

Rather than go into a lot of detail all I need to achieve is continuity
betwenn A & B on the linked diagram but I can only use a momentary switch
(SW1)

http://rapidshare.com/files/253373634/2443_001.pdf

Can someone confirm if the planned circuit will work ie when SW1 is
momentarilly closed then continuity will provided aacross A&B until the 12V
power is switched off.

Yes, that should work as you describe, assuming the relays are
correctly chosen etc.


Also on a different topic, I need to connect a 10k pot to my inverter to
vary the power output. Circuit diagram shows 3 connections,

1) +10V (Power terminal of Pot)

CW clockwise end of element

2) Analog frequency signal input terminal

WIPER

3) 0VAnalog common point

CCW counter-clockwise end

Any idea how I identify which pin is which on my pot

Cheers

Jim

If it's a single turn pot, the wiper is usually the center pin. If
it's a 3 or 10 turn panel-mounted pot, then usually the back one.

Check by using an ohmmeter. Center the shaft. (assuming a 10K pot),
the two pins that measure about 10K between them are the pot
"element", so the remaining pin is the wiper.

Turn the pot full clockwise. The element end that measures about zero
to the wiper is the one that goes to +10. The other goes to 0V, and
the wiper goes to the analog input.

On a single-turn pot, with the shaft FACING you, and pins DOWN, the
three pins will (almost always) be CCW, WIPER, CW. This is so commonly
known that you likely won't even find it on the data***.



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