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My switching power supply (mc34063) makes audible noise
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iMo:
You will always see some ripple caused by the switcher. You may minimize it with careful layout, construction and filtering (LC filters usually work best).
SiliconWizard:
You may also refer to this: https://www.eevblog.com/forum/chat/mods-are-asleep-post-eevmemes/msg2785716/#msg2785716
 ;D
sarfata:
Yes I solved the issue. As far as I remember, just adding more capacitance on the output saved the day.

I agree with @SiliconWizard and have stopped using the mc34063. The TI based webtools to generate power supply designs are quite amazing. You dont need to do the math, they give you tons of options and yes the chip is more expensive but for 3.3V they have highly integrated circuits that will require a lot less additional parts. Less parts => less PCB space, less time spent on digikey searching for a specific capacitor, etc. You will save time and money by using them.
OwO:
There are a LOT of cheap SOT23 all-in-one buck converter ICs, some with compatible pinouts and up to 3A output current. For example for low voltage (5V) there is FP6373, JW5211, etc with the same pinout. For higher voltage there is JW5033, RT8258, etc (easily found on LCSC). These also usually switch at 1MHz or higher which means you can use small inductors (there are size 1008 ones that can go up to 2A, still very cheap because they are used in cellphones).
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