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Digital potentiometer for volume control
Digital potentiometer for volume control
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Old 12th November 2019, 09:23 AM   #11
sarathssca is offline sarathssca  India
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we may look at the DS1882 digital potentiometer (doesn't have any opamps inside, just a analog signal potentiometer which is controlled digitally via i2c). it needs to be connected to a very high input impedance stage (may be a buffer - discreet/opamp). and also takes care of zero crossing issue and also needs dual supply upto +/-7v.
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Old 12th November 2019, 09:47 AM   #12
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by Tengil View Post
This one does look promising. However, there is a delay up to 16 ms before switching volume to eliminate the noise. .
This is only in the absence of a zero crossing. With normal signal, zero crossings happen all the time and switching is near-delay-less. Only when there is no zero crossing the device waits 16ms and then switches anyway. So it is more a safeguard to allow switching in the absence of signal than a normal operation. And if it switches in the absence of signal there is no noise anyway.

Jan
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Last edited by jan.didden; 12th November 2019 at 09:52 AM.
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Old 12th November 2019, 10:30 AM   #13
adrianbaugh is offline adrianbaugh  United Kingdom
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Quote:
Originally Posted by sarathssca View Post
we may look at the DS1882 digital potentiometer (doesn't have any opamps inside, just a analog signal potentiometer which is controlled digitally via i2c). it needs to be connected to a very high input impedance stage (may be a buffer - discreet/opamp). and also takes care of zero crossing issue and also needs dual supply upto +/-7v.

With zero crossing enabled the DS1882 allows itself a 50ms window to change resistance, which would not meet the OP's requirement.
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Old 12th November 2019, 11:55 AM   #14
jan.didden is offline jan.didden  Europe
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Originally Posted by adrianbaugh View Post
With zero crossing enabled the DS1882 allows itself a 50ms window to change resistance, which would not meet the OP's requirement.
This is only in the absence of a zero crossing. With normal signal, zero crossings happen all the time and switching is near-delay-less. Only when there is no zero crossing the device waits 50ms and then switches anyway. So it is more a safeguard to allow switching in the absence of signal than a normal operation. And if it switches in the absence of signal there is no noise anyway.

Jan
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Linear Audio articles - SilentSwitcher - Treg high voltage regulator - High-voltage delay unit
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