# Tag Info

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Welcome to the board! Let's start with a caution: random YouTube videos are not a good way to learn about electrical safety. Your first question: what if you touch a bare wire connected to an electrical outlet? If it's the neutral (often white in USA) or ground (green) wire, nothing, because these are at ground potential. If it's a hot (black) wire, then you'...

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You will conduct current if you can provide a path from the exposed wire to a destination of different potential. Whether or not you get electrocuted (or even just shocked, as "electrocution" implies injury or death but I suspect you're just asking about getting, let's say... "zapped" in general) is a function of the amount of current ...

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First of all it's important to be clear that being electrocuted means death by electrical shock where a shock may cause injury but is not fatal. You seem to be mixing these two terms. As far as what would happen if you touched a closed circuit, the answer is that it depends. Keep in mind that electricity tends to follow the path of least resistance back to ...

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You solder station designed to use in industry. They usually have ground separate from power ground, which is for safety. For home use you may replace power cable with 3 wire and grounding pin and connect green wire to chassy. The iron body should be grounded. That crocodile style connector for antistatic rug and bracelet.

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Of course the grounds have to be connected. Nothing works without a return path for currents, or reference voltage between two circuits.

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Yes, devices with grounded plugs need ground or their mains EMI filter makes the ground to have half of mains voltage appear on e.g laptop metal parts. That is why you get shocks or may damage equipment when connecting e.g. grounded devices to your laptop while it is connected to your ground-bypassed charger. The warning reads on almost any equipment with a ...

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IMO it is totally wrong. Don't understand why everybody her is so enthusiastic about this circuit. simulate this circuit – Schematic created using CircuitLab EDIT: You want to use a N-MOSFET as high side switch, so you can control it with floating PSU controling the Vgs voltage. So it has be connected to Gate and Source, not to load common. Also this ...

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Ground just means a 0V reference point, but can be floating. Earth ground means that reference is also connected to earth and thus is a safety 0 V ref

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Q1. Is the Arduino ground or the common ground the same as Earth ground? Why or why not? Not unless the Arduino ground is connected to Earth ground. In the case of battery powered equipment there is usually no connection between the two. Similarly any isolated mains supplied devices won't have a ground - Earth connection. Q2. Is the Arduino ground or the ...

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Tying the grounds of two (otherwise) isolated power supplies together is fine. The way you have done it is fine.

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It is possible to use an analog switch in this way. For digital 20 MHz signals, the switch resistance and capacitance will not have any noticeable effect. However, analog switches are more complexity than actually required, and when the D/E signals already are grounded, you do not need connect them to anything. The output is either the same as the input, or ...

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Using a thin dielectric layer (<=32 mil) will provide better stray shielding and lower controlled impedance , when using this size board with a gnd plane below.

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A ground plane in the top layer via is ok but it’s likely to be fragmented, especially if the board density is high. If you have a ground plane on an internal layer then you’re only ever one via away from a low-impedance ground. In contrast, if your fill has lots of necks and fingers then it won’t work as effectively.

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I have had bad experience with a ground rod. I drove a six foot copper pipe into clay soil to ground an antenna and then used an ohmmeter to find its resistance to the house ground system which was connected to the power company and a ground rod at the box. The box was about 60 feet from the antenna. I was surprised to measure 40 ohms. This happened twice. ...

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The problem is just that certainly all of the pairs still need to be referenced to ground somehow before going into the multiplexer IC Use 2 multiplexers; one for one wire in your differential pair and one for the other wire. Step and repeat for all differential pairs and, feed the multiplexed (common) output pair into a differential amplifier. This is ...

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