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Optocoupler for p-ch JFET attenuator?
Optocoupler for p-ch JFET attenuator?
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Old 4th May 2013, 10:19 PM   #1
miallen is offline miallen  United States
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Join Date: May 2009
Default Optocoupler for p-ch JFET attenuator?

As shown in the attached schematic fragment, H5 is a control signal from an Arduino that is supposed to control the "mute" circuit. I'm wondering if it would be a bad idea to connect the uC's ground here. Or perhaps I should replace the transistor with a optocoupler. I want to reduce, if not, eliminate the possibility of feed-through. What should I do here?
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Old 8th May 2013, 10:58 PM   #2
hesener is offline hesener  Germany
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Join Date: Mar 2005
Location: Munich, Germany
Optocoupler for p-ch JFET attenuator?
a regular optocoupler will do (e.g. H11, with a current-limiting resistor from vcc into the coupler and then into the base of that bipolar). do not connect the grounds if you can avoid it....
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