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New version volume controls
New version volume controls
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Old 21st September 2004, 08:26 AM   #1
polsol is offline polsol  South Africa
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Join Date: Aug 2004
Location: Cape Town
Default New version volume controls

I am "resurecting" my interest in Hi-Fi DIY so beg forgiveness for this question as I am somewhat "out of date".
I notice that many pieces of audio equipment now have "infinite" turn volume controls which I assume work by providing some sort of "pulse" to a volume control chip. Does anyone have any reference to these chips/circuits and volume controls (in other word where can I get?).
One of the major weaknesses with the old type of "pot" was that the track would eventually wear out and I see these newer types as a big step forward.

Tony M
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Old 21st September 2004, 11:04 AM   #2
analog_sa is offline analog_sa  Europe
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Join Date: Aug 2002
Location: Cascais
These devices are binary encoders, most commonly two-bit encoders. You need a digital circuit to keep track of position/direction and a separate device to control volume.

Ultimately the sound quality will depend upon the volume control device. For cheaper applications there is a variety of digitally controlled 'pots' with reasonable sound quality (CS3310,PGA2310,WM8816). For top qualty, a relay-operated switched attenuator can also be controlled by a binary encoder.
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Old 21st September 2004, 12:16 PM   #3
till is offline till
Join Date: Apr 2002
Location: Germany, Clausthal
I made volume controls with PGA2310 and with relays, using those rotary encoders and a MC.

In case you are interested in the circuits you may want to click the www button under this posting.
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