@jea48
Hi Jim,
Not a dumb question at all about seeing if the pop occurs when a different input is selected. That would definitely be of interest, as would the answers to my questions one of which was about whether the pop disappears if the SP3 is muted. And yes, a grounding issue does seem conceivable.
The fact that the volume control utilizes a rotary optical encoder isn't particularly helpful, though, at least without detailed information on the circuitry that follows its photo-detector, both within the control and externally to it. That kind of control works by shining a LED near the circumference of a rotatable disk having a large number of radially-oriented slots through which the light can shine. As the control is rotated a photo-detector produces an output in the form of a pulse each time a slot moves in front of the LED, and subsequent circuitry utilizes the string of pulses to control how much attenuation is introduced, perhaps after first converting the number of pulses into a corresponding change in a DC voltage.
Best regards,
-- Al
Hi Jim,
Not a dumb question at all about seeing if the pop occurs when a different input is selected. That would definitely be of interest, as would the answers to my questions one of which was about whether the pop disappears if the SP3 is muted. And yes, a grounding issue does seem conceivable.
The fact that the volume control utilizes a rotary optical encoder isn't particularly helpful, though, at least without detailed information on the circuitry that follows its photo-detector, both within the control and externally to it. That kind of control works by shining a LED near the circumference of a rotatable disk having a large number of radially-oriented slots through which the light can shine. As the control is rotated a photo-detector produces an output in the form of a pulse each time a slot moves in front of the LED, and subsequent circuitry utilizes the string of pulses to control how much attenuation is introduced, perhaps after first converting the number of pulses into a corresponding change in a DC voltage.
Best regards,
-- Al