potentiometers New ANY NEED?
 

WE have an outlet for new Potentiometer's I am curios as to how many would be interested in the perchase of this Item? :D

Are you referring to the dash light dimmer unit ?

I know the older 126 cars are potentiometers that directly connect to the power. The 2nd gen 126 cars are actually PWM controllers.

I am interested. Price?

I just jumper it on the cars where it fails. 100% power is barely bright enough as it is. :D

potentiometers
 

Yes I am refering to air flow unit.:cool:

potentiometer price
 

the price would be around $50.00:D

WTF, are you talking about !

He's referring to the rheostat dimmer for the instrument cluster and dash lights. Usually the left most knob on the cluster.

Early unit are simple rheostat potentiometer. Later versions (at least in 126) are PWM control units. They're backwards compatible too!

Thats more clear, Thanks

Interesting, if they're PWM they should be able to dimmer a set of LEDs

Not necessarily, they are likely too slow and you'd end up with a strobe instead of steady lighting. An LED responds to pulses a lot differently (faster) than an incandescent....

I'm waiting for my soldering iron to heat up so I figured I'd give it ago:

From what the scope says, it looks like the PWM controller outputs about 160 Hz signal. Here's the datasheet on the IC: http://www.datasheetcatalog.org/datasheet/stmicroelectronics/1408.pdf

http://i.imgur.com/YN1Ywl.jpg

I had some random 2V, 20mA Red LED sitting around, I threw a 500 Ohm resistor on it and here's the result. It does indeed dim... With better/brighter LED's you could probably achieve a better result.

For wiring reference:
http://i.imgur.com/7HNkLl.jpg

Video, I didnt see any strobing effect when I filmed this:
http://img.photobucket.com/albums/v6..._aMVI_8150.jpg

KE air flow potentiometer .
 

Yes that KE air -flow potentiometer ; very difficult to source out but sorts out all cold start and erratic warm-ups if the track is worn out .
Specific to cold starts only .
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those pots are $2 ea at my local pick a part.

If you have a bad air flow potentiometer and one can be replaced with a new one why care if it is china that manufactured it? it might not last as long as the original but what after market item dose? ALL I am asking is there enough interest in it to make it worth my time to offer them! at a good price.

Just-In-Time, I appreciate your thoughtful offer. Those potentiometers are hard to find.

Bought mine from him, for a spare.
Air flow potentiometer Mercedes 190E 16V 300E 560SEL | eBay

SG-Motorsports Air Flow Meter Potentiometer Replacement

yes and I was turned on to this by another member and thought I would make contact with the intention of stocking some, I just thought I would run this by every who keeps the older equipment, but I do not wish to have a :cool:hundred units sitting in limbo.:eek:

If this is for W123 300D 1984 model, I am interested. How much will it cost? Is this brand new or reworked?

On the LED being run from a PWM source.

If strobing is an issue, a capacitor could be added in parallel to the output to smooth things out. Depending on how large the cap is and max current availible from the PWM unit, a resistor might need to be added in series to the cap to limit charging inrush current when things are turned on.

( The resistor might be needed because a capacitor looks like a dead short until it charges up. )