Symbol variation.

Bukitoo · 18th February 2004, 04:18 AM

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

Thanks !

Jan Dupont · 18th February 2004, 08:44 AM

Thats a potentiometer with a built-in center-pin (Gnd) and a variable output pin.

Bukitoo · 19th February 2004, 05:51 AM

Hi again !
Thanks !!!!

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

Thanks again !

Jan Dupont · 19th February 2004, 06:49 AM

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.

Sch3mat1c · 19th February 2004, 04:46 PM

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

18th February 2004, 08:44 AM	#2
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	Thats a potentiometer with a built-in center-pin (Gnd) and a variable output pin. __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

19th February 2004, 06:49 AM	#4
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	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. __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

19th February 2004, 04:46 PM	#5
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	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 __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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19th February 2004, 05:51 AM	#3
Bukitoo diyAudio Member Join Date: Feb 2004 Location: Buenos Aires	Hi again ! Thanks !!!! Sorry my ignorance, but what is the purpose of that pin ? Thanks again !

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