Check out some similar questions!

dimpleprincess898 · Dec 16, 2009, 08:30 AM

how should I connect a 2.2k variable resistor with 3 terminals in a circuit?

Stratmando · Dec 16, 2009, 08:46 AM

Never seen a 2.2K Pot, may need a 5 K pot and resistor, do you need to go all the way from Zero ohms to
2.2k. Your range will determine if the resistor needs to be parallel, or series with your pot.

donf · Dec 16, 2009, 08:49 AM

Dimple,

Is this related to the exit sign you are trying to install?

If so we need to keep the posts together since it it the same problem.

cshaffer · Dec 16, 2009, 08:50 AM

Instructions: Things You'll Need:
Digital MultiMeter (DMM)
Circuit using a variable resistor (with schematic)
Soldering iron
Solder

Step 1: Identify the location in which you wish to place your variable resistor by finding the variable resistor symbol in your schematic. In most schematics, the variable resistor symbol is a regular resistor with an arrow pointing to the center of its length.

Step 2: Verify the ends and wiper of your variable resistor using your DMM set on Resistance. The fixed ends of the resistor will usually be the two outer legs of the three legs of your device. Clip your DMM leads to the outer leads--you should see the full value listed on the case of your variable resistor. This will not change as you turn the knob of your resistor.

Move one lead of your DMM and clip it to the center leg of the resistor. The resistance reading should change as you turn the knob. If this does not work, experiment on which combination of legs gives you the fixed full value and which show a change as the knob is turned.

Step 3: Using your soldering iron and solder, connect the two fixed legs to the end points defined in your schematic. It will not matter electrically which end goes to which point in the schematic. Mount the device for easy access by the user.

Step 4: Adjust the wiper position so it is in the middle of the device (the fifth turn position on a 10-turn resistor, or the middle of the sweep for a single turn resistor). This will give the best heat dissipation when you solder the center leg.

Step 5: Solder the center leg to the wiper connection shown in your schematic. In most schematics, this will be the arrow lead on the variable resistor.

Tips & Warnings:
If you are replacing a failed variable resistor in a circuit and are unable to find an exact match, meet or exceed the wattage rating as your priority. Next, meet or minimally exceed the resistance value rather than using a lower value resistor.When soldering, remember the tip of the iron is hot. Do not touch the soldered points until after at least a two -minute cooling time. Always remove any flux from a soldered connection. Gummy flux residue attracts metal shavings and may lead to shorts in the future.

Stratmando · Dec 16, 2009, 08:52 AM

Why 2.2K?

dimpleprincess898 · Dec 16, 2009, 08:55 AM

Originally Posted by Stratmando

Never seen a 2.2K Pot, may need a 5 K pot and resistor, do you need to go all the way from Zero ohms to
2.2k. Your range will determine if the resistor needs to be parallel, or series with your pot.

Please see the attachment and kindly help :(

donf · Dec 16, 2009, 09:05 AM

Dimple, where do you live?

This calls for a 230 V 50 Hz primary transformer. With a secondary of 9 V. 500mA output. There is a stamp on the front of the page indicating that the article is from Kumar?

If you are in the USA I strongly suggest your getting a different schematic unless this is for a commercial venue.

Also, this post needs to go into the "Electronics" forum and not Electrical.

You are working at the component level not doing residential electrical wiring.

Stratmando · Dec 16, 2009, 09:16 AM

Here's where you can find your Pot:
Digi-Key - P16NP-2.2K-ND (Manufacturer - P16NP222MAB15)

dimpleprincess898 · Dec 16, 2009, 10:01 AM

Originally Posted by cshaffer

Instructions: Things You'll Need:
Digital MultiMeter (DMM)
Circuit using a variable resistor (with schematic)
Soldering iron
Solder

Step 1: Identify the location in which you wish to place your variable resistor by finding the variable resistor symbol in your schematic. In most schematics, the variable resistor symbol is a regular resistor with an arrow pointing to the center of its length.

Step 2: Verify the ends and wiper of your variable resistor using your DMM set on Resistance. The fixed ends of the resistor will usually be the two outer legs of the three legs of your device. Clip your DMM leads to the outer leads--you should see the full value listed on the case of your variable resistor. This will not change as you turn the knob of your resistor.

Move one lead of your DMM and clip it to the center leg of the resistor. The resistance reading should change as you turn the knob. If this does not work, experiment on which combination of legs gives you the fixed full value and which show a change as the knob is turned.

Step 3: Using your soldering iron and solder, connect the two fixed legs to the end points defined in your schematic. It will not matter electrically which end goes to which point in the schematic. Mount the device for easy access by the user.

Step 4: Adjust the wiper position so it is in the middle of the device (the fifth turn position on a 10-turn resistor, or the middle of the sweep for a single turn resistor). This will give the best heat dissipation when you solder the center leg.

Step 5: Solder the center leg to the wiper connection shown in your schematic. In most schematics, this will be the arrow lead on the variable resistor.

Tips & Warnings:
If you are replacing a failed variable resistor in a circuit and are unable to find an exact match, meet or exceed the wattage rating as your priority. Next, meet or minimally exceed the resistance value rather than using a lower value resistor.When soldering, remember the tip of the iron is hot. Do not touch the soldered points until after at least a two -minute cooling time. Always remove any flux from a soldered connection. Gummy flux residue attracts metal shavings and may lead to shorts in the future.

Thanks a lot :) I got my answer in steps 1 and 5.thats what I'm looking for :)

Stratmando · Dec 16, 2009, 02:13 PM

You saw the Pot here?:
Digi-Key - P16NP-2.2K-ND (Manufacturer - P16NP222MAB15)

DanielF · Dec 16, 2009, 11:21 PM

There are a number of answers here going off at a tangent, ignoring the original question (which is how to connect the three-terminal pot in a circuit requiring a 'rheostat' connection).

I'm assuming you want clockwise rotation of the pot to increase charge-rate.

Look at the pot with the shaft/knob/screwdriver slot facing you. Going around the periphery of the pot body, label (in your head, not literally) the three pot terminals 1, 2 and 3. '2' is the wiper, '1' and '3' are the ends of the resistive track. Join '1' and '2' together and connect them to the 'top' end of your circuit (the regulator's 'ADJ' terminal). Connect '3' to the 'ground' of the circuit.

Once you've set the optimum charging current for the battery type, you shouldn't need to change it again (unless you change battery size/type). So I'd suggest using a trimpot rather than a panel pot. And of course 2k2 is a standard value for trimpots (as well as fixed resistors - the E12 range of standard values), though perhaps not readily available in 'backward' countries. :-)

Daniel