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Math Keeps Me Busy
Math Keeps Me Busy
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Post Reopened by Loic Daigle, Davide Andrea, Math Keeps Me Busy
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Loic Daigle
Loic Daigle
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I am trying to make a hotplate with an ESP32 and I use MC34063 for buck/boost converters. The hotplate itself require 12-30V to operate and the ESP32 and LEDs need 3.3V.

Here is the circuit:

DC-DC Converter Circuit

When the circuit is powered, I hear (almost) nothing while the ESP32 is booting but after that, I can hear an annoying audible noise. I tested with an oscilloscope and the output of the MC34063 seemed to have a frequency between 10 and 15kHz.

I have already checked this question but it does not seem to have a complete solution for my case.

You can find the complete schematic here and the PCB here

Does anyone knows how to solve this?

I am trying to make a hotplate with an ESP32 and I use MC34063 for buck/boost converters. The hotplate itself require 12-30V to operate and the ESP32 and LEDs need 3.3V.

Here is the circuit:

DC-DC Converter Circuit

When the circuit is powered, I hear (almost) nothing while the ESP32 is booting but after that, I can hear an annoying audible noise. I tested with an oscilloscope and the output of the MC34063 seemed to have a frequency between 10 and 15kHz.

I have already checked this question but it does not seem to have a complete solution for my case.

You can find the complete schematic here and the PCB here

I am trying to make a hotplate with an ESP32 and I use MC34063 for buck/boost converters. The hotplate itself require 12-30V to operate and the ESP32 and LEDs need 3.3V.

Here is the circuit:

DC-DC Converter Circuit

When the circuit is powered, I hear (almost) nothing while the ESP32 is booting but after that, I can hear an annoying audible noise. I tested with an oscilloscope and the output of the MC34063 seemed to have a frequency between 10 and 15kHz.

I have already checked this question but it does not seem to have a complete solution for my case.

You can find the complete schematic here and the PCB here

Does anyone knows how to solve this?

Post Closed as "Needs details or clarity" by Andy aka, toolic, user319836
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Loic Daigle
Loic Daigle
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Audible Noise in MC34063-Based Buck/Boost Converter Circuit

I am trying to make a hotplate with an ESP32 and I use MC34063 for buck/boost converters. The hotplate itself require 12-30V to operate and the ESP32 and LEDs need 3.3V.

Here is the circuit:

DC-DC Converter Circuit

When the circuit is powered, I hear (almost) nothing while the ESP32 is booting but after that, I can hear an annoying audible noise. I tested with an oscilloscope and the output of the MC34063 seemed to have a frequency between 10 and 15kHz.

I have already checked this question but it does not seem to have a complete solution for my case.

You can find the complete schematic here and the PCB here