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Description: There are lots of trimpots out there. Some are very large, some so small they require a screwdriver. Here at SparkFun, we just needed a simple one that worked. This 10K trimmable potentiometer has a small knob built right in and it's breadboard friendly to boot! Perfect for your next LCD contrast adjuster, opamp setting, or volume level. This model # is TSR-3386U within the datasheet.


  • Datasheet(Note pins are in a single row, as shown in the pictures)

Replaces: COM-08647

Comments 20 comments

  • Bless you for getting a trimpot with a knob on it that is a short, manageable size. I’m sick of having to saw down the usual kinds!

  • It fits in a breadboard, but it’s not quite “friendly”. The friction of turning the knob is almost as much as the flex strength of the leads coming out the bottom. Turning the pot in a breadboard requires two hands to avoid damaging the leads. I haven’t broken a lead off yet, but they got pretty bent up before I figured this out.
    Still, can’t beat the price for those infrequently-tweaked settings.

  • I was adjusting one of these last week and the knob came off, revealing a little slotted shaft. It goes back on easily, but revealed that this little trimpot can be used in close quarters, with a screwdriver, with or without the knob. The shaft can be set up to protrude through a hole, as well.

  • is there any round date that these will be back?

  • If anyone is interested I’ve made a tutorial on using these to control servos via an Arduino.


  • Can this pot be used as a replacement for a project where a 100K linear pot is specified?

    • Probably not, the range is only 1/10th of what’s specified. It would be best to find a 100k linear. Check mouser or digikey, they have a LOT of options.

  • Love this little trimmer … perfect for prototyping. Need different values!!! Looked on the datasheet but still confused about the actual part number. Is it TSR-3386U-103T or TSR-3386U-EY5-103T? I need it so I can find other values at other vendors.

  • It says this part is in the eagle library. What is it called in the library?

  • If it’s “breadboard friendly” (meaning 0.1" pitch), wouldn’t the EAGLE footprint be the same as the knobless 10K trimpot you’ve got?

    • Why was that dumb? Yes - the same footprint should work, we just haven’t checked it so be wary.

      • The pin footprint is the same, but the case on this one is slightly larger than the aforementioned knobless one. I just checked on one of my designs which used your 10K, this one would not fit.

    • Scratch that. That was dumb.

  • The 200 cycles rating is typical for trimpots with knobs. Just buy a bunch of them if they’re going to be used a lot, ‘cause they will wear out. For a volume control, a more substantial panel mount potentiometer or encoder should be used.
    This is a good price for this type of trimpot. It would be nice if other values (e.g. 5K, 20K, 50K, 100K) were made available too.

    • This is the kind of trim pot to throw in a tool box or a parts bin that can sit in there gathering dust until you build the prototype for your next “LCD contrast adjuster, opamp setting, or volume level” or whatever.
      A panel mount pot or a shaft encoder is going to have a better life span, so use one of those in the final design. Or use this in a final design that might need occasional trimming.
      But if you are building a proto for a filter or amp for your next radio or stereo or whatever, this pot will do the job. Or use it in a final design and make it easily replaceable. Use those engineering skillz.

    • Yep, you would not want to use this as a volume knob. It’s probably not accurate enough and too noisy. Great for just a simple trimpot. (which it is!)

      • RobertC,
        I wasn’t criticizing its legitimacy as a trimpot, but the description above includes “Perfect for your next LCD contrast adjuster, opamp setting, or volume level.”. As you agree that this component is not suitable as a volume control, perhaps you’d care to edit the description.
        For the record, I did check the specs for a few potentiometers claimed to be suitable for volume control and the specs for a few trimpots before I wrote my original comment. I found 5-10k cycles as typical for the former and 200 as typical for the latter.

  • Umm, the datasheet appears to specify a “rotational life” of 200 cycles. Doesn’t that make the part far better suited for trimming a circuit that’s adjusted rarely than it is suited for such things as volume control?

    • It is not out of the question to create a prototype audio outputting circuit that does not require the user to adjust the volume. But, you are correct, this is probably not a part that you would use on a production device unless that device needs to be factory tuned.

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