New version volume controls

polsol · 21st September 2004, 08:26 AM

I am "resurecting" my interest in Hi-Fi DIY so beg forgiveness for this question as I am somewhat "out of date".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.

Regards,

analog_sa · 21st September 2004, 11:04 AM

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.

till · 21st September 2004, 12:16 PM

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.

21st September 2004, 08:26 AM	#1
polsol diyAudio Member Join Date: Aug 2004 Location: Cape Town and Kuwait	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volume controls I am "resurecting" my interest in Hi-Fi DIY so beg forgiveness for this question as I am somewhat "out of date".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. Regards, __________________ Tony M

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21st September 2004, 11:04 AM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	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.

21st September 2004, 12:16 PM	#3
till Banned 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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