Variable CO resistor :: Cappuccino Owners Club

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Variable CO resistor (currently 636 views)

Ezra

Posted on: Friday, June 18th, 2010, 1:12:42pm

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Theoretical write up on how to wire a pot-meter as a variable resistor. Which you can then use as a variable CO resistor.

Step 1
Identify the terminals on the potentiometer. With the post upright and the terminals facing towards you, they are referred to as "1," "2" and "3" from left to right.

Step 2
Solder a wire to terminal "3" inline with one of the terminals of the CO resistor socket.

Step 3
Cut a short piece of wire and strip the ends a little.

Step 4
Jump terminals "2" and "1" by soldering the wire between the two.

Step 5
Solder a wire from terminal "1" back the other terminal of the CO resistor socket.

Step 6
Use the knob of the potentiometer to vary resistance. At "0" the resistance will be negligible and at "10" the pot will operate at its full rated resistance.

* When selecting a pot to use as a variable resistor, remember that its rating indicates its maximum resistance.
* A 2.5k ohm resistor would be more than sufficient.
* Linear taper pots have a more precise response compared to logarithmic pots and are better suited as a variable resistor

Wired up it will look like this:

Info on the potentiometer:
http://en.wikipedia.org/wiki/Potentiometer

Info on the CO resistor:
http://www.clubcappo.co.uk/board/Blah/Blah.cgi?b=HT,m=1140126614

The location of the CO resistor (socket):

When you look for the CO resistor in the engine bay you'll have one of these resistors (or no resistor at all):

L1 = 680 ohm
L2 = 430 ohm
L3 = 270 ohm
L4 = 160 ohm
L5 = 82 ohm

R1 = 1k ohm
R2 = 1.5k ohm
R3 = 2.2k ohm

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