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This was damaged in shipping. Looking it over I THINK it's a rotary encoder. ALPS seems to have forgotten they ever made the part. Printed on the back is ALPS 242N. Can't find any specs on it.

all together now

inside of knob mount

inside of knob

underside of knob ALPS 242N

UPDATE --
Picked up an ALPS EC12E2420801 (24 Res, 24 Detent). Wrong part...
Need to measure all the dimensions first next time. The original part is 16mm wide, the EC12 is <13mm. Had to go searching through mouser data sheets to find one with the correct dimensions. Waiting for the new one to show up but it looks like it should work.

Final Update -- Finished! Picked up a Bournes PEC16-4220F-N0024 (24 PPR, 24 Detent) and it works perfectly. I don't know if the original had detent or not, but I like the feel of it.

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  • \$\begingroup\$ tell the shipper. (lol) poor packing material. It's an "incremental type" 2phase 24 pole rotary encoder . without? detent \$\endgroup\$ May 13, 2017 at 21:53
  • \$\begingroup\$ Alps won't want to talk to you directly unless you are an OEM. If you try to sub there is some chance the encoder will fit and have close enough the number of pulses but may work backwards (in which case you could hack and swap the two outer pins A and B. \$\endgroup\$ May 14, 2017 at 2:48
  • \$\begingroup\$ Someone from ALPS did respond to an inquiry but couldn't find a reference to that part themselves. They were suggesting their potentiometers, which I was pretty sure was wrong. \$\endgroup\$
    – Simurr
    May 15, 2017 at 4:14

3 Answers 3

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It's definitely a rotary encoder - looks to be a conductive 24 PPR variety.

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It's a rotary encoder for sure. Unless the part number is written on the board / part, you will have big difficulty to find it. I recommend you to email the manufacturer to have more information about that part. As long as you explain your situation : that the board has been damage during the delivery (with picture), they will either give you the part number or change the board for a new one.

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  • \$\begingroup\$ Old hardware from an auction. There isn't the possibility of sending it back. \$\endgroup\$
    – Simurr
    May 15, 2017 at 0:55
  • \$\begingroup\$ You can remplace it with another rotary encoder. As long the new part have the same step as the old one, it will work. \$\endgroup\$
    – M.Ferru
    May 15, 2017 at 1:11
  • \$\begingroup\$ Exactly why I'm asking what this specific part is (or equivalent). \$\endgroup\$
    – Simurr
    May 15, 2017 at 4:10
  • \$\begingroup\$ How many steps have the previous encoder ? \$\endgroup\$
    – M.Ferru
    May 15, 2017 at 6:51
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probably that is the EC12 Series from ALPS

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  • \$\begingroup\$ From the comments I would say a 24 PPR with Bushing Type, without detent (though with detent would probably work just fine as well). I'll have to measure it later to get the exact possible replacement. \$\endgroup\$
    – Simurr
    May 15, 2017 at 4:26
  • \$\begingroup\$ sadly, not an EC12 \$\endgroup\$
    – Simurr
    Jul 15, 2017 at 21:50

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