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DUAL 100K MOTORIZED POT

CAT # MPOT-100K (3 Reviews) Write a Review

$ 3.50
$3.50 each
10 + $3.00 each
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Product Description
• Dual 100K linear pot powered by reversible 5Vdc gearhead motor
• Overall dimensions: 25D x 64mm including shaft
• 6mm knurl slotted shaft is 14mm long
• 8 PC pins on pot, single row
• Solder-loop terminals on motor
WARNING: May cause cancer or reproductive harm.
California Prop. 65
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Customer Reviews (3 Reviews)

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DUAL 100K MOTORIZED POT

Reviewer: from Westlake Village, CA,USA

While this is being advertised as a dual 100k potentiometer the two potentiometers are not completely isolated. They share a common pin. Also, it is not perfectly linear. The B-4 rating is the 2nd to the least accurate of the linear series of potentiometers.

Also, there are two pins that I have no idea how they are internally connected but they share resistances with the two 100k potentiometers. These are pins 1 and 4. Pin 8 is a no connect.

Special note on resistance between pins 1 to 7 and pins 4 to 5. These pins are approximately 50k at full ccw and full cw however they reduce in resistance as you turn the shaft and pass through 0 ohms near the center position.

Other observations:
The motor draws approximately 30 mA during rotation and approximately 40 mA when stalled against the end of travel.
The gear box is a little nosier than I expected but not too bad. It takes approximately 6 seconds to travel one full rotation.

As viewed from the bottom with the knob forward. Pin 1 on the left:
R1 is pin 1 to pin 6 with the wiper on pin 7
R2 is pin 2 to pin 6 with the wiper on pin 5
Pin 8 is no connect
Pin 1 to pin 4 is approximately 95.4k
Resistance between pin 1 to other pins vary as does pin 4 to other pins. I could not include a table because this review format won't allow it.

Overall this is a good deal for the price and having a common pin between the two pots is not a big deal if you intend to use it as a volume control since most stereo outputs share a common ground. I knocked off one star for the poor linearity of the B-4 series. If you want to see charts for the different series you can go to this Bourns site:
https://www.potentiometers.com/pdf/prm16.pdf

18 of 18 people found this review helpful. Do you? Yes No  Certified buyer

Typos?

Reviewer: from Boise, ID

The comments from Westlake Village were helpful in figuring out the pinouts of this pot.
However, I think there are some typos. The following are connections I observed:

As viewed from the bottom with the shaft towards you. Pin 1 on the left:
R1 is pin 2 to pin 6 with the wiper on pin 7
R2 is pin 3 to pin 6 with the wiper on pin 5

Pin 1 is a center tap on R1
Pin 4 is a center tap on R2

POT-1
1--------------- |
2-------/\/\/\/\/\/\/\/\---------6
7---------^

POT-2
4--------------- |
2-------/\/\/\/\/\/\/\/\---------6
5---------^

7 of 7 people found this review helpful. Do you? Yes No  Certified buyer

Here's what I found on these motorized pots

Reviewer: from Montrose, CO

I believe these are older ALPs pots, but I did find something similar.
searched aliexpress for Z PRM 100KB-4

https://www.aliexpress.com/item/32853199257.html
https://ae01.alicdn.com/kf/HTB1a4CJoRTH8KJjy0Fiq6ARsXXav.jpg

I verified the pin connections on my parts to match column 4 shown in jpg url above. My pots are both 91K. Can't comment on linearity or other aspects.

4 of 4 people found this review helpful. Do you? Yes No  Certified buyer


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