Hi all,
I've been working on a parallel 'deluxe' board from China but unfortunately no schematic. I don't understand the reasoning for the RC circuit they added across the feedback resistor as well as how they calculated the component values. I don't think it's an RC oscillator cicuit, but could be wrong. The cap in circuit is actually 47 pF multi layer ceramic. Anyone any ideas?
Thanks
I've been working on a parallel 'deluxe' board from China but unfortunately no schematic. I don't understand the reasoning for the RC circuit they added across the feedback resistor as well as how they calculated the component values. I don't think it's an RC oscillator cicuit, but could be wrong. The cap in circuit is actually 47 pF multi layer ceramic. Anyone any ideas?
Thanks
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See the discussion here for similar considerations with the LM3886.
LM3886 Chip Amp Stability Analysis
I suspect they have had stability problems.
The feedback resistor path on a chip amp should be as short as possible.
1mm = 1nH of inductance which causes phase shift.
The 7293 and 7294 also have a min gain to keep stability.
The feedback resistor path on a chip amp should be as short as possible.
1mm = 1nH of inductance which causes phase shift.
The 7293 and 7294 also have a min gain to keep stability.
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