EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: Jwillis on September 14, 2020, 10:23:12 pm
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I managed to figure out how to wire a Dual MN taper potentiometer for a balance control but I was wondering if anyone here knows of a symbol for this type so I can clarify my circuit diagram without extra notes . If a symbol does not exist how would you create one for an editor . Any suggestions?
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What is MN?
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Graphs of different tapers:
http://www.alpha-products.com/cd_catalog/new_catalogs/Pots/tapers.htm (http://www.alpha-products.com/cd_catalog/new_catalogs/Pots/tapers.htm)
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After much googling my understanding is that a "MN taper potentiometer" is actually two pots which are linked:
https://www.bourns.com/docs/ProAudioDocs/bourns_pdb182_blend-balance_guitar_pots_appnote.pdf (https://www.bourns.com/docs/ProAudioDocs/bourns_pdb182_blend-balance_guitar_pots_appnote.pdf)
One pot has a M-taper and the other has a N-taper. Is that correct?
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Okay then, a typical stereo balance control.
I have seen them on diagrams with a resistor halfway and a straight line the other half, and ganged with another with the reverse setup.
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After much googling my understanding is that a "MN taper potentiometer" is actually two pots which are linked:
https://www.bourns.com/docs/ProAudioDocs/bourns_pdb182_blend-balance_guitar_pots_appnote.pdf (https://www.bourns.com/docs/ProAudioDocs/bourns_pdb182_blend-balance_guitar_pots_appnote.pdf)
One pot has a M-taper and the other has a N-taper. Is that correct?
Not quite . They can be single or dual gang but usually the dual gang is sold . From 0% voltage to 100% voltage only 50% of the pot is turned to the centre indent. After the indent its 100% voltage from 50% to 100% turn of the pot. With a dual pot you configure it so that at the indent both pots pass 100% voltage. When you turn the pot one way one pot decreases the voltage while the other pot remains at 100% voltage through the turn . When you use them in this configuration for balance you get no losses in one channel as the other channel is turned down in volume . The same happens when you turn down the pot the opposite way to lower the volume of the other channel other channel.
But I got thinking it would be easiest just to change the identifiers on the legs . Centre would become source and the other legs would become M and N . For a dual MN it could be drawn like below .
What do you think?
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Okay then, a typical stereo balance control.
I have seen them on diagrams with a resistor halfway and a straight line the other half, and ganged with another with the reverse setup.
I think this method most unambiguously identifies the two terminals.