I tried a search for guard rings but the only thread I could find was http://www.diyaudio.com/forums/lounge/146693-john-curls-blowtorch-preamplifier-part-ii-2809.html#post3197965 but I wanted to know if guard rings are a good thing in regular op amp use. I was planning to tweak the low pass filter on a DAC, and it would be an easy thing to add guard rings using high standoff ic sockets, but if there is no real advantage in regular use I can skip the guard rings.
properly driven guard rings actually bootstrap away PCB dielectric errors as well as DC leakage
but the added capacitive coupling can give destabilizing positive feedback too
so you can in principle get some of the advantage of exotic PCB materials like Teflon with careful layout and driven guards
but its not often that such concerns are in your top 10 unless you design condenser mic or guitar pickup preamps
but the added capacitive coupling can give destabilizing positive feedback too
so you can in principle get some of the advantage of exotic PCB materials like Teflon with careful layout and driven guards
but its not often that such concerns are in your top 10 unless you design condenser mic or guitar pickup preamps
Guard rings are used in instrumentation applications where the transducer/source being amplified is at an extremely high impedance. Can't think of an audio source that matches that discription so I very much doubt they could be necessary.
Using high standoff IC sockets would increase the supply impedance at the opamp pins, this cannot improve the sound. Go for the lowest impedance power supply you can manage.
Using high standoff IC sockets would increase the supply impedance at the opamp pins, this cannot improve the sound. Go for the lowest impedance power supply you can manage.
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