[Know-How] Forbidden 6 things in electronics

This time I'll show you "forbidden things" when you enjoy electronics.
There are 6 points in total.
Please see this if you're a beginner or worried how you take care of electronics.
-Table of Contents
0:00 Opening
0:23 1. Close naked metals
1:02 2. Use too many supply pin on Micro-controll-board
1:37 3. Connect/Reconnect wires or parts with keeping power supply turn on
2:25 4. Place something burnable nearby where you experiment
3:01 5. Assemble circuits by using just your imagination or memory
3:23 6. Continue to experiment although unexpected things happened
4:00 Advice
-Related Link
-Introduction
Hardware engineer
9 years experience as a Maker
-SNS
Web : start-electronics.com/
Twitter : / buonoatsushi
#Electronics
-Content
The first thing to do is to experiment with bare metal close together.
If you stick a breadboard with long legs or use a lot of cables, there is a danger that even the slightest vibration will cause the metals to contact each other. In the world of electricity, contact even for a tenth of a second will cause a large current to flow, resulting in failure.
Take countermeasures in advance, such as cutting off long legs and wrapping metal parts with insulation tape. In addition, to prevent large currents from flowing even if contact is made, the power supply should have a built-in so-called overcurrent detection function. You can find out if this function is available by looking at the data sheet or instruction manual.
The next point is to use the power supply pin of the microcontroller board as the power source for everything.
Microcontroller boards like Arduino and microbit have power pins like 5V and 3.3V, which are quite useful for experiments. However, these power supply pins actually use rather poor circuitry and elements and cannot carry a lot of current.
When using power supply pins, do not connect too many components and, if possible, figure out the amount of current for each component beforehand. The contents of the power supply pins are explained in another video, so please watch that one as well.
The next thing to do is to disconnect wires and components while the power supply is on.
This is technically known as "live wire insertion and removal" or "active insertion and removal," and is one of the things you should not do. The moment of disconnection may seem momentary to the human eye, but electrically, the voltage will remain unstable for quite a long time. In particular, components with many pins may malfunction or fail because of a slight time gap in the way the voltage on each pin rises. For example, it may happen that the voltage of a signal line rises first, even though the power supply should be applied first.
Although live wire insertion and removal does not always result in breakage, and I sometimes do it myself, be sure to turn off the power before connecting or disconnecting the device without any hassle.
Next, conduct experiments by placing flammable materials around them.
Although it is hard to tell from the appearance of electronic components, they often become unexpectedly hot during experiments. In particular, components such as resistors, transistors, FETs, coils, and regulators are often used where a lot of power is consumed, so they often get hot and require attention. Depending on how they are used and the environment, temperatures exceeding 100°C are common.
So, do not place anything flammable around them during the experiment. If you are unsure, you can try touching the components directly with your fingers after turning off the power to see if they are hot.
The next step is to build a circuit from "imagination" or "memory.
Transistors, diodes, push switches, etc. have component orientations, and if you build a circuit from your imagination or memory, current may flow through unexpected routes, leading to failure or malfunction.
If you do not know the pin assignments, check the datasheet or, to be more certain, check the circuit with a tester before assembling it.
The last thing to do is to continue the experiment even if the behavior is unexpected.
Usually, experiments are conducted with some kind of "expected behavior" in mind. However, it is often the case that things do not go as expected immediately after the power is turned on. In such cases, it is advisable to turn off the power once and examine what the problem is, instead of continuing the experiment.
If you continue to turn on the power, there is a possibility that the current will be concentrated in a part of the circuit, which may lead to further damage such as strange smells or noises. Especially when experimenting for the first time, it is recommended to do so while keeping one hand on the power supply or switch so that you can immediately shut off the power if you feel something unusual.
Finally, as a tip, it is recommended that before turning on the power, you point and check to make sure that the wiring and components are facing in the correct direction.

[@yamatotakeru3719]

電子工作初心者にとり大事な注意事項ですね。活性挿抜、活線挿抜・・・と言う言葉を初めて聞きました。活性挿抜の説明が１番参考になりました。有り難うございました。チャンネル登録させて頂きました。

[@BuonoTV]

コメントとチャンネル登録ありがとうございます！ 他の方がどういうところに困っているか参考にしたいので、他にも分からない用語とかあればご質問いただけるとうれしいです👍

[@user-ex8kr8df1e]

部品自体は高温がダメですが、ハンダ面は260℃前後の[ハンダ槽]という装置を通過させるので高温には耐性が有ります。

[@BuonoTV]

コメントありがとうございます！ そうなんですね、ハンダ面だけ耐熱性が高いっていうのはあんまり意識したことなかったです。 豆知識ありがとうございます👍

[@biritaco]

指差し確認で安全に楽しみます！🐙

[@BuonoTV]

はい、一緒に安全に電子工作を楽しみましょう👍

[@nihonbattoutai7757]

電気はプラスからマイナスに流れると言いますが実際はマイナスからプラスに流れていると教わりました。 電気回路を作る時、電気はマイナスからプラスに流れているって事を意識して作るのですか？

[@BuonoTV]

ご質問ありがとうございます！ 正確にいうと、「電子」は実際にはマイナスからプラスに流れているが正しい表現だと思います。 実際に回路を作ったり実験をするときは、あまりその点を意識することはないですし、意識しなくても大抵のことはできてしまいます。 ただ、電子部品の動作原理だったりを考えるときは、電子の動きを考えることになるのでそういう時は意識する、という感じですね。 ご参考になればうれしいです！

[@nihonbattoutai7757]

@@BuonoTV 返信ありがとうございます！！ 数十年のモヤモヤがやっと晴れました！！ 昔、電気回路に親しむのに電子ブロックという玩具がありました。今はもうありませんね。

[@user-bu8jg5ez8u]

電子工作失敗あるあるですね。

[@BuonoTV]

そうですね、「あるあるネタ」として見てもおもしろいかもですね。