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Old 18th February 2004, 05:18 AM   #1
Bukitoo is offline Bukitoo  Argentina
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Default Symbol variation.

Hi !!
I need to know what does this symbol means. Actually I Need to know the purpose of the 4th pin.

Thanks !
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Old 18th February 2004, 09:44 AM   #2
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Thats a potentiometer with a built-in center-pin (Gnd) and a variable output pin.
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Old 19th February 2004, 06:51 AM   #3
Bukitoo is offline Bukitoo  Argentina
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Hi again !
Thanks !!!!

Sorry my ignorance, but what is the purpose of that pin ?

Thanks again !
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Old 19th February 2004, 07:49 AM   #4
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I have never used this type of component myself, but I can emagine that it could be used for several purposes such
as DC-offset regulation etc.
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Old 19th February 2004, 05:46 PM   #5
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I once had a PA amp which had such a control. Turn it to the left and AUX is fed through; to the right, microphones. Not the same as a balance control because the two are never simultaneously present!

Arranged as a normal volume control (one end grounded, other to source, wiper to amp), a small cap (47~1000pF depending on impedance) between CT and source pins is known as a loudness connection. It accounts (crudely ) for reduced HF sensitivity in your ears when listening at low volume.

Tim
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