Good shielding electronic circuits by tin plate in a plastic or wood box/does copper or alum. work?

The video shows how to shield electronic circuits that are made on a wooden plate (with brass nails or on perf boards or on printed circuit boards or whatever) in a very easy way. Also discusses (only textbox) aluminum and copper plate shielding properties, do they work?

And how to make properly functioning electronics that need shielding.

The under-side of the 1,8 cm plywood (or wood) is covered with steel plate out of beer cans or cola cans (must be steel, otherwise no soldering is possible, many soft drink cans are made of aluminum nowadays, they are useless fort his purpose).

The steel plates are glued to the under-side and soldered together with wires.

With a plastic box that shielding can be glued to the inner side with contact glue like Bison Kit.

The side panels are made with triplex (or another wood product) and to the inner side of the wooden panels tin plate is glued.

All the tin plate sides are (must be) soldered together with wires to make 1 (one) galvanic connected “unit”. That “one galvanic unit” is soldered with one (1) wire to the “one and only” earth connection of the whole electronic circuit: be it an audio amplifier, a HF amplifier, a HF oscillator, a Shortwave radio up to 18 MHz, an audio mixer, complicated audio circuits & filters, etc. Above 18 MHz it could be that other ways of electronic constructing work better.

This refers to plastic boxes and wooden boxes, when you want to make or need shielding. In general: shielding by iron (tin plate) is always necessary in electronic circuits. Aluminum does not work properly. Copper is usable in HF to shield coils, the damping for EM waves in cases of copper plate or aluminum plate is (too) low for perfect shielding. On the other hand: that low-shielding-effect of aluminum and copper plate is a blessing, especially when shielding HF radio coils by keeping the Q high + shielding at the same time.

But for “perfect earth shielding” copper and aluminum don’t work, sorry for that…

Many circuits on (say) Banggood are not sold in a properly shielded box with properly shielded outputs, they are “only” on an open circuit board. By the way: no problems with that.

But when you want to “build them in” in a box it could be that you meet problems with these pre-fabricated units. Anyway, they need steel shielding in that case.

Making more than 1 earth connection in all these circuits, both AF and HF or Shortwave, can give (severe) problems.

Problems: strange waveforms in an oscillator, hum problems in audio amplifiers, audio mixers etc.

So this video is only a demo and it shows “good practice” in standard electronic circuits.

All the videos hat I have published on You Tube can be found via my Channel Trailer: Link is

In thematic order you can find these video’s under the “comments” section.
Important: to find all the links to the (+/-700) video’s on my YT Channel, select, in the comments section, “NEWEST FIRST”

My books about electronics are available via the website from “Lulu”, search for author “Ko Tilman” there.

https://www.lulu.com/shop/search.ep?keyWords=ko+tilman&type=

There is an important video via which you can buy a document where I give links to many of my video’s, published between 2010 and 2018.

Link is: https://youtu.be/XXRsA24NUE0

My books are also available via Barnes and Noble and via Amazon.
Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on YouTube. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you can not (!) be sure about the original content (=really working electronics) and important adaptations to the circuits.

Be aware of that, I saw on the internet my circuits reproduced in a poor or even not proper way. I can not help that, sorry. Upload 25 february 2019.