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Old 2nd February 2009, 06:19 PM   #1
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Default Panasonic EVJ

Bought two EVJ-YK1F03368 units

At max resistance:

unit 1, channel 1: 49.8 kohm
unit 1, channel 2: 48.6 kohm
unit 2, channel 1: 48.7 kohm
unit 2, channel 2: 47.5 kohm

at min resistance:

unit 1, channel 1: 5.6 ohm
unit 1, channel 2: 3.2 ohm
unit 2, channel 1: 5.5 ohm
unit 2, channel 2: 3.3 ohm

at center detent:

unit 1, channel 1: 41.6 kohm
unit 1, channel 2: 8.36 kohm
unit 2, channel 1: 40.6 kohm
unit 2, channel 2: 8.15 kohm

Is this normal? The two units show good consistency but what the heck is up with the resistance at the detent? I didn't measure resistance anywhere besides those 3 points.
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Old 6th February 2009, 12:24 AM   #2
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Also, at minimum resistance, the channels show significantly different resistance. I'm starting to think I really did order the wrong part - perhaps a tone control...?

(this post also serves as a bump )
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Old 6th February 2009, 12:48 AM   #3
PH104 is offline PH104  United States
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I think you're measuring it wrong. The low and high ends are ok, but at the middle the sum of two readings adds up to the correct resistance so it seems that channel 1 is being measuring from "top to bottom" and channel 2 is measured from "bottom to top".

The spec sheet is at:
http://www.panasonic.com/industrial/...aok0000ce9.pdf
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Old 6th February 2009, 01:15 AM   #4
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I sure hope I'm measuring it wrong, but I can't seem to find the right combination that gets me the resistances I'm supposed to get.

I did check it. Staying with the same leads does not give me the right resistances in the middle.
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Old 6th February 2009, 01:28 AM   #5
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charted: merely check the row against the column for the lead resistances as per the datasheet

Click the image to open in full size.

ah, the resistance between II1 and II2 for full CW should be 48.5k, not 48.5
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File Type: gif pot_resistances.gif (6.1 KB, 136 views)
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Old 6th February 2009, 09:17 AM   #6
h_a is offline h_a  Europe
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Quote:
Also, at minimum resistance, the channels show significantly different resistance.
That's perfectly normal for pots, lookup the datasheet, this pot allows +-3dB difference between channels - that's +-40%. Better ones guarantee 1.5dB, but only at higher levels - still 19%.

If it's logarithmic, it's not a tone control.

Have fun, Hannes
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Old 11th February 2009, 10:14 PM   #7
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I think I got the wrong part here.

http://dkc3.digikey.com/PDF/C091/P1948.pdf

The curve is AC whereas the correct curve should be A or D.

Damn it!
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Old 1st March 2009, 01:06 AM   #8
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I think I've figured out what I need for volume control; either the EVJ-Y10F03A24 or the EVJ-Y10F03A54 should work (vertical, metal bushing, A-type log taper, 20K or 50K respectively). If somebody could confirm that, I'd be quite appreciative.

However, my question now is whether 20K or 50K would be better for general use. Tracking seems to be better away from the extremes, so the 20K would stay away from the high end of the resistance. However, it seems that 50K is more common as a volume control. Some help here would be great.
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