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Critique my PCB! Headphone amplifier
Critique my PCB! Headphone amplifier
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Old 4th December 2017, 02:40 PM   #31
abza is offline abza  South Africa
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Quick question regarding the decoupling capacitors: Are the values I've got ideal?
  • 100uF electrolytics & 22uF X7Rs for the buffers
  • 22uF X7Rs for the opamp

I know @00940 mentioned that the 22uF X7Rs, given capacitance fluctuation due to voltage changes, would be less than ideal... and even 10uF caps would be better there.

I also read in this Analog Devices article that they recommend a very small (0.01uF - 0.1uF) close to the device and a larger (10uF - 100uF) cap further away, per rail.

While @JPS64 uses 0.1uF, 2.2uF and 100uF for each rail in his schematic.

Which values and types should I be using, assuming my current selection is less than ideal?
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Old 4th December 2017, 03:29 PM   #32
OlegSh is offline OlegSh
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Critique my PCB! Headphone amplifier
I would use 0.1uF and 100uF, assuming that electrolytic capacitor is not much further than an inch from the IC.
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