Experimenting with Magnetic Components #2: Low Power Buck Converter for IoT Home Automation

RE: Experimenting with Magnetic Components #2: Low Power Buck Converter for IoT Home Automation

Frood — Tue, 29 Mar 2022 14:04:05 GMT

Hello I have question about acoustic noise of power inductor. Do you have problem like this ?

If so , how could you solve this ?

RE: Experimenting with Magnetic Components #2: Low Power Buck Converter for IoT Home Automation

Jan Cumps — Wed, 17 Nov 2021 19:47:00 GMT

Two questions about the first PCB:

[View:/resized-image/__size/231x422/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-ce373e77-0e41-4979-ba76-e81449405fb4/contentimage_5F00_217696.png:231:422]

Did you etch this at your home/lab?

What material is it? I thought impregnated paper, but the ones I see here are different, brown/beige. Your PCB looks Burgundy-red on the photo.

RE: Experimenting with Magnetic Components #2: Low Power Buck Converter for IoT Home Automation

Jan Cumps — Tue, 16 Nov 2021 13:44:43 GMT

[View:/resized-image/__size/610x682/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-ce373e77-0e41-4979-ba76-e81449405fb4/contentimage_5F00_217688.png:610:682]

Family photo.

RE: Experimenting with Magnetic Components #2: Low Power Buck Converter for IoT Home Automation

michaelkellett — Tue, 16 Nov 2021 13:05:49 GMT

While the intention of the blog is fine, I must point out that your experiment, as described, is potentially lethal.

In the pictures you show your test board connected to the standard 220V AC supply with wires joined by twisting the exposed bare ends together.

Then some standard test gear is connected to the board.

This set up it potentially lethal.

If you make a mistake in the wire twisting then what you expect to be the “0V” side of your circuit will be connected to AC live - it may blow a fuse, or it may drive the exposed metal parts of the test equipment to 220V AC.

Even if the connections are as intended, the exposed bare wires can easily be accidentally touched, which can cause injury or death.

The danger of presenting these pictures is that some one else may be encouraged to follow your example.

To test a circuit like yours, any connection to the AC mains should ALWAYS be made via an isolation transformer.

Connections should be made using touch proof connectors.

There should be an isolation switch (preferably a panic button type).