encoder behavior... i don't get it

[ultra]

i have some alps encoders (ec12 series i believe) and i don't understand their behavior.  when i turn it, all three leads connect, which obviously gives me bad results when changing values on my sequencer.  does anybody have an idea of what's going on here?

thanks,

drew

[lylehaze]

Sounds about right.

Three leads.. A, B, and Common.

Phase A will be connected to Common 50% of the time

Phase B will be connected to Common 50% of the time

Phases A and B are 90 degrees out of phase.

So...

All three terminals will be shorted together 25%

of the time.

You can see that pattern on page 5 of the Alps datasheet.

If my description matches your encoder, then it appears

to be working well.

Good Luck,

LyleHaze

[ultra]

in that case, the improper behavior (it only increments downward) must be a wiring deal.  i'm using the center as the common.  i'll try it another way and thanks for your response.

:)

drew

[lylehaze]

I checked the sheet again. There are a lot of different

models in the EC12 series, but all of the 3 pin packages that I saw had common in the middle, and A and B on either side.

Good Luck,

LyleHaze

[/tilted/]

I believe the STEC16 series has the common on one side rather than in the centre.