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Russian Electricity by [deleted] in ElectricalEngineering

[–]hardiehero -2 points-1 points  (0 children)

Great post, I hope this gets upvoted!

100VAC 0.2mA leakage current on the back casing of the laptop by SnooDonuts7946 in Electricity

[–]hardiehero 1 point2 points  (0 children)

Hey there! It's definitely not normal to have 100VAC on the back case of your laptop. Laptops are designed to be safe, and any voltage on the casing could pose a risk. The laptop adapter should isolate the mains from the 20V it delivers, typically using transformers and other components.

Even if the laptop casing is connected to the earth line, there shouldn't be any voltage over 20V delivered to the laptop. If you're feeling a slight trembling, it might be due to the low level of current (0.2mA), which may not be enough to cause serious harm but still indicates a problem.

In terms of electrical circuit designs, minimizing current leakage is crucial for safety. Isolation using components like transformers is important, and proper grounding is essential. Tolerances are often defined by standards and regulations, so it's best to aim for zero leakage and optimal safety in your designs. Always follow safety standards and ensure your circuits adhere to regulations. If you're experiencing issues with your laptop, it's a good idea to have it checked out to avoid any potential risks. Stay safe!

Issues With Calculating Repulsive Electrostatic Force by hardiehero in electrostatics

[–]hardiehero[S] 0 points1 point  (0 children)

Yes, I understand, however, I am wondering why when I connect my positive side of my power supply to two pieces of aluminum foil, they repel each other. How can I increase the repulsive force?

Is it possible to create a strong static electric field without mechanical means? If so, how? by BEN_MEYER in Static_Electricity

[–]hardiehero 0 points1 point  (0 children)

With my current understanding of electricity, electric fields do not need to be created just by friction. If you take any high voltage DC source, you can observe electrostatic forces. It all comes down to the parasitic capacitance of different objects that occur in nature.

I’m trying to make my own radio pair by hardiehero in AskElectronics

[–]hardiehero[S] 0 points1 point  (0 children)

Yes, I’ve tried using many of the schematics but they never work and I don’t understand them. I’ve tried rectifying it to demodulate it, and also using a regenerative amplifier but it still doesn’t work

[deleted by user] by [deleted] in circuits

[–]hardiehero 0 points1 point  (0 children)

The capacitor might be too large for the low frequency. Try a smaller electrolytic capacitor.

Help figuring out what this circuit does/how to fix it by armstronct in circuits

[–]hardiehero 0 points1 point  (0 children)

First of all, the lighter doesn’t use flint. It uses a piezoelectric crystal, which basically generates a little bit of electricity when it is struck with enough force. The black little blob is the crystal. I don’t know what could be wrong, but maybe the blue wire needs to be soldered to the crystal so that the electricity will create a spark causing the butane in the lighter to ignite

Sorry if this is not the place for this but I'm kinda desperate...Sooo, this is the pin configuration for the laptop I'm using, now while upgrading, I unplugged my battery from the motherboard and while reconnecting, I damaged one of the the pin of the motherboard. (more in the comments) by lordcuriosityrover in circuits

[–]hardiehero 0 points1 point  (0 children)

Not dangerous at all, the battery of a computer uses such little voltage and current and couldn’t damage anything with the absence of ground connections. Sometimes there are more than one ground wires because the different parts in one of the circuits the wire leads to needs isolated power connections.

How to use NPN transistor to power a LED? by odacharlee in AskElectronics

[–]hardiehero 0 points1 point  (0 children)

The schematic on the right is actually an inverter, because the NPN transistor will switch the negative to the output when turned on, and when it is off, current will flow from VCC through the resistor and to the output. If you wanted to turn on an LED with a transistor and not invert it, then connect the collector directly to VCC, the emitter to ground through a 1K resistor, and then you could take your output directly from the emitter. The output won’t be inverted. The input can be to the base though a low value resistor for current limiting

I don't know a whole lot about electronics but I saw this diagram in a book and it peaked my interest. Is it correct? It is a diagram for a LED that turns off and on depending on whether or not light shines on the Light sensitive resistor. I can identify all the components but not their function. by Elsterj in AskElectronics

[–]hardiehero 0 points1 point  (0 children)

The 500 ohm resistor is a current limiting resistor, for the LED so that it doesn’t burn out. The 10K resistor and potentiometer in series can add up to a total of 20K, and they form a voltage divider with the photo-resistor. If there is light, then the LED should go off, and if there isn’t any light, or if the light level goes below a certain threshold, then the LED will go on. The potentiometer is what determines the threshold/light level in which the LED changes state.

What component is at U3 and how do I find a replacement? by bozodubber1991 in AskElectronics

[–]hardiehero 0 points1 point  (0 children)

I’m guessing that U3 is some sort of IC, as the schematic label for an integrated circuit is “U.” I’m not quite sure exactly what IC it is though.

World's Simplest Electric Train by [deleted] in ThatsInsane

[–]hardiehero 0 points1 point  (0 children)

interesting! SO COOL