Bought an Alps RK27 volume pot. It says 50/100k selectable. Schematic calls for 100k, but I only measuring 50k on the pot.
Does anyone know how to change (select) to 100k?
This: https://www.amazon.com/dp/B0CBYTN43N
Does anyone know how to change (select) to 100k?
This: https://www.amazon.com/dp/B0CBYTN43N
They're both 50k out. I get 100k only if I measure across Right-out to Left-out
I'm thinking it's 2 separate pots, one for left, one for right.
I guess the next question is would 50k work just fine?
I'm thinking it's 2 separate pots, one for left, one for right.
I guess the next question is would 50k work just fine?
Description from seller says " 50/100k selectable" , it means you have a choice to select 50k or 100k variant , by messaging to seller. If markings on potentiometer says 50k or 503 , it's 50k version. I very doubt if there's any need to make dual potentiometers with different resistances, for stereo you need matched .
The part number says 50k, and brand says generic. Just return it and get the genuine Alps 100k,
which costs more than the $5. generic pot. Also, Alps does not make the RK27 with a knurled shaft.
https://www.mouser.com/ProductDetail/Alps-Alpine/RK27112A0A16?qs=Xb8IjHhkxj7yFzrECyPQoA==&mgh=1&gclid=Cj0KCQjw9rSoBhCiARIsAFOiplnbZ6EaLQuk_Rvxz4vCjLGz39YuS8reUpszMobZMJcLCgk2DqqSj5gaAkAGEALw_wcB
You may be able to use it anyway, if the 50k value works in your circuit, and if the unknown quality is ok.
which costs more than the $5. generic pot. Also, Alps does not make the RK27 with a knurled shaft.
https://www.mouser.com/ProductDetail/Alps-Alpine/RK27112A0A16?qs=Xb8IjHhkxj7yFzrECyPQoA==&mgh=1&gclid=Cj0KCQjw9rSoBhCiARIsAFOiplnbZ6EaLQuk_Rvxz4vCjLGz39YuS8reUpszMobZMJcLCgk2DqqSj5gaAkAGEALw_wcB
You may be able to use it anyway, if the 50k value works in your circuit, and if the unknown quality is ok.
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If its 2 separate pots, then how could you measure from left out to right out and get 100k? It should be infinite if they are completely separate.
This screenshot was made after clicking link from post #1 , scroll down till Description .There's clearly seen word selectable , which explains why op got not what expected .With "ad" you mean shopify app banner at bottom of screenshot ,or something else ?
Thanks for all the input guys.
Ya, there was no place when ordering to "select" a 100k. So I was thinking there was some kind of physical config to switch it/double it up.
I still have time to return for refund and I think just swap for this one: https://www.amazon.com/ALPS-Round-shaft-amplifer-potentiometer/dp/B07J9KYQV2/
looks like the 100k version of what I thought I was getting.
Ya, there was no place when ordering to "select" a 100k. So I was thinking there was some kind of physical config to switch it/double it up.
I still have time to return for refund and I think just swap for this one: https://www.amazon.com/ALPS-Round-shaft-amplifer-potentiometer/dp/B07J9KYQV2/
looks like the 100k version of what I thought I was getting.
Okay. Well, I suppose its time to figure out how its wired. If you can measure 100k between wipers, that means there is tie somewhere, maybe at 'ground?' If so, maybe you can get one 100k pot or a stereo set of two 50k pots?
Pots are not something that I try to save money on so much. Some of the generic are likely just fine. If it is an important project for me, then I go ahead and buy at least brand name.
Though linear taper ones cancel out(*) the distortion if the wiper current is negligible - which is one reason the Baxandall volume control circuit performs really well.
(*) The two arms of the track either side of the wiper carry identical current, so their voltage ratio is insensitive to non-linearity of the track material - even carbon tracks can perform well. Logarithmic pots won't get precise cancelation due to the different current densities at different parts of the taper. And if the track isn't uniform (low quality) the cancellation also suffers.
(*) The two arms of the track either side of the wiper carry identical current, so their voltage ratio is insensitive to non-linearity of the track material - even carbon tracks can perform well. Logarithmic pots won't get precise cancelation due to the different current densities at different parts of the taper. And if the track isn't uniform (low quality) the cancellation also suffers.