Questions tagged [polarity]

Polarity is a conceptual entity. Pole means a direction. However, an object is called as "having polarity" or "having specific polarity" means a preference to a differential-behavior of something in forward and backward direction.

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35 views

Cable wires - confirmation of live and ground

I bought a generic DC power extension cable and I'm trying to wire it to a connector with a cable attached. The connectors cable clearly has two wires - a red and black/+ and -. This is what I'm used ...
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26 views

Programmable polarity switch for DC circuit

My question concerns a future research project in electrocoagulation (water treatment) I am planning right now. I will have a lab power supply connected to two (or more) plates in water. The ...
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Parabolic wave equation, electric and magnetic field definitions

The split step solution for Parabolic Wave Equation (PWE) applied to the tropospheric propagation problem is: $$u(x+\Delta x, z)=e^{ikM(z)10^{-6}\Delta x}\mathfrak{F}^{-1}[e^{\frac{-ip^2\Delta x}{2k}}...
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71 views

Socket polarity

So recently I was installing these old fairy lights and its plug was burnt due to faulty connections, So I bought a new plug and replaced the old plug. I was wondering why do these fairy lights do not ...
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3answers
126 views

Reversed polarity of CR2025

My bike light uses two CR2032 batteries, which I replaced with CR2025 and some padding. It stopped giving light, so I removed the batteries and measured voltage. One battery gave 2.8 V, and another -1 ...
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33 views

ensuring transducer (transmitter) and receiver polarity

I am trying to implement a simple phased array of 7 transmitters rated 40 kHz. I have a few receivers to measure the acoustic field generated to validate if it works. What is a simple way to measure ...
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2answers
171 views

Can I trust in visual inspection to identify LED terminals?

In the figure above, LED A is a regular 5mm LED and the visual identification of its terminals polarity is well known. As you can see, on LED B the anode is identified by the longer leg, but the ...
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48 views

ESD Protection diode polarity

I'm using the following ESD protection diode: On the datasheet it says: MOUNTING POSITION: Any Does it mean I can assemble it at any polarity? (switch cathode and anode connections)
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110 views

Can I use this DPDT relay with this circuit? If so, which wires connect to what terminals?

I'm following this tutorial to wire an automatic chicken coop door. The DPDT relay they're using is different to my relay so I'm finding it difficult to understand which wires connect to where. I'm ...
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3answers
104 views

Phase or polarity for North America residential 240V

I understand that for North American residential, the three wires coming into the panel box are +120V,-120V, and Neutral. Is there such a thing as phase or polarity between these three wires? How is ...
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161 views

What happens if I change the polarity of the battery?

Suppose if i charge a capacitor. Now if I reverse the polarity of the battery, how much is the heat produce during that process? My book says as change in energy = 0 (in capacitor) therefore heat ...
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164 views

Switching between battery and external power sources with reverse polarity protection

In my design, I will use AA batteries to power the electronics board. As a requirement, also it should accept the power from external power supply (12V) - The board should automatically switch from ...
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48 views

How can line code polarity inversion happen?

One of the disadvantages of some line codes like NRZ-L or RZ is that if a sudden change in polarity occurs, then all received bits will be erroneous (flipped). How can such a sudden change in ...
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53 views

AC/DC Power adapter plug: difference between center positive/negative

Why are some power adapters center positive and others center negative (less common, at least around me)? Is there any compelling reason, something that asks for one or the other for different ...
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2answers
435 views

What is the polarity of this barrel plug with a double circle?

Related but doesn't answer my specific icon: How to tell polarity expected of a DC barrel jack? I have a dell laptop barral plug adapter, and I can't tell from the graphic whether the tip is positive ...
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49 views

How to rapidly switch polarity of two plates?

If I have two metal plates, with P1 connected to V+, and P2 connected to GND, how can I alternate the polarity of these two plates? I wish to have P1 connected to GND, and P2 connected to V+. Then ...
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170 views

Connect IR Emitter (+) to IR Receiver (+)?

I have a vehicle stereo deck that has an IR receiver input (+) and a steering wheel control module that has an IR emitter LED (+/-). The steering wheel control module, "translates" (using a mapping ...
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33 views

Reverse polarity protection LiFePo4

I'm doing a project with esp32 devkit v4 and I'll be supplying it with external power (LiFePo4 3.2V cell). I want to do a protection in case the battery gets connected inversely. I searched about it ...
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Why do we use polarized capacitors?

I want to know if the polarized capacitor has some advantage that they are used in some circuits? For example, in a schematic of the BISS001 PIR controller IC, in some places, a polarized capacitor ...
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206 views

Why is the electrolytic capacitor not polarity sensitive?

The issue I was making a project in which I had to use a 2.2uF electrolytic capacitor in series with a microphone and weirdly, the circuit works even if I toggle the polarity of the capacitor, that ...
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80 views

How do I add a bipolar stepper motor to this circuit? [closed]

I have just started electronics at school and cannot find any tutorials on how to do this. I am creating a circuit that when the light intensity increases a bipolar stepper motor will step clockwise ...
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1answer
63 views

Polarity. What do “C” & “P” signify?

G4 bi pin LED bulb. Silicone coated Hello all. Thanks for the forum. I have some of these: G4 bi pin LED bulbs. Silicone coated dimmable 12 volt DC. They are 1.5watt. Although not visible on this ...
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263 views

help understanding this reverse polarity protection circuit

Going through LT4363 evaluation kit DC2062A-B (schematic here), I came across a reverse protection circuitry that protects downstream components from reverse transients and reverse DC voltage: In ...
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2answers
104 views

Is this relay datasheet incorrect? (Omron G6SK-2)

I'm using Omron G6 series relays, both the non-latching (G6S-2) and and dual coil latching (G6SK-2) for a few PCB designs. What I didn't know was that some models of relays give their connection ...
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212 views

LEDs in computer case are non-polar?

Normally I think of LEDs being polar and having a definite current direction, the "D" in LED standing for "diode". However, in working with with a computer case recently, the front part of the case ...
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Question About Current Flow Direction [closed]

I've got a question that has been perplexing me for a while. (Correct me anytime) (Please do not give me any textbook definitions.) Starting with the name of the question itself, I believe current ...
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1answer
178 views

Is this capacitor polarized?

I recovered a few capacitors of this style from an old cassette player. As far as I can tell, it seems like Mylar film, but the “100⊖” marking has me wondering. Is this some peculiar shaped tantalum ...
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373 views

Identifying polarity of capacitor from PCB printing

I took out the old capacitor and didn't remember to check the polarity because I assumed the board would have more standard markings. Is there any way to figure it out with a meter or by the printing?
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164 views

Is it possible for a voltage multiplier to be used to provide both positive and negative voltage?

What I was wondering is it is possible to use a single voltage multiplier to provide a negative and positive voltage. Referring to this voltage doubler circuit, if you connect a capacitor to the top ...
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1answer
65 views

Why I don't get horizontally-polarized TVs in the satellite from time to time? [closed]

Something like once every 2 days I cannot watch horizontal SAT channels for about a half day. It says "no signal". During this "no signal" time I get very rarely watchable time. Like 1 minute in an ...
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203 views

Conflict of polarity?

With the following circuit, would the R2 resistor not change or affect the polarity in some negative way (no pun intended)? In the image below I added the red box as well as the red text in an effort ...
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300 views

Which one is the positive side?

I'm newbie, thus my simple question. In the schematic below, which side of the capacitors is the positive? Why? Or are they assuming that I have to use ceramic capacitors? Usually my schematics come ...
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6answers
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Why plug is polarized in the US? What are the benefits?

I could not get a good hold of it, I searched online quite a bit. This must have to do with safety but then non-polarized switches are used through out the world with no issues are risks, so my ...
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146 views

Undervoltage/capacitor problems with Raspberry Pi

My question is about the correct way to add a capacitor to a circuit with a Raspberry Pi driving a servo. I have seen undervoltage events in the logs of my app when the servo runs so I added a 470uF/...
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904 views

Mesh Current Polarity, Equation Setup

Practicing Mesh Analysis I came across this problem and te answer is really alluding me and I believe is just one polarity that I'm not understanding, the problem is the following... Vs​=10V, R1=...
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748 views

How to find Voltage based on reference nodes?

I came across this problem and I'm trying to really understand it. VB is the voltage drop across a particular element, it is the change in voltage from node a to node b. Find the value of VB in ...
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3answers
157 views

Transistor switch without polarity

I've successfully used an Arduino Uno to trigger Halloween props by closing the normally open circuit on an SRD-05VDC-SL-C relay. I am basically replacing a contact switch and tapping into each prop's ...
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2answers
113 views

Polarity question

In a -48 volt DC power plant system how do you determine the polarity of 0v? trying to resolve an issue and not sure how to correctly identify
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1answer
118 views

Proper Flyback Current Protection Circuit for Variable Voltage Solenoid Driver

I am using a darlington buffered op-amp to drive a solenoid motor at variable voltages (for variable speeds of actuation). Here is my circuit as it is now: I am wondering which of the two flyback ...
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3answers
1k views

Reversing USB power polarity, but no black wire

My goal is to create a USB-to-USB cable with reversed polarity in order to charge an old Gameboy Advanced SP. I could just go on Amazon and buy a charging cable, but I do enjoy a fun little project ...
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1answer
71 views

Motherboard's 4 pin DC input polarity

I have a motherboard, that requires a DC input. The manual has this: I'm trying to find a power brick, but all bricks I can find usually have +12V/-12V on pins or shell and no ground. Can I use them?...
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326 views

Electromagnet Polarity Reversal Doesn't Matter?

I am working on an engineering design project for school which uses the electromagnet linked below to "lock" a door. The problem is that the electromagnet remains energized or magnetized even after ...
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1answer
132 views

Can I use polarized capacitors in a location where they shouldn't be polarized? [duplicate]

I've been in the process of restoring a jukebox. Recently I figured out that the junction box, which holds quite a bit of resistors fuses and capacitors, has three large capacitors from the 60-ies... ...
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89 views

Transformer windings - Polarity - FEMM

I am designing a transformer in FEMM and I was wondering about the polarity of the windings. The following figures illustrate two cases. When I run the simulation, the magnetic field in the first one ...
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2answers
3k views

Why is this power cable sometimes polarized and sometimes not?

I have a handful of power cables like this: Some have polarized male plugs, while others are not polarized. Given that the female end appears to be reversible, why are some of them polarized? I ...
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4answers
90 views

Reverse Polarity Protection, External Circuit

I'm trying to figure the best way to protect the external circuit from a short if a user mistakenly connects the sensor in the wrong polarity. I use a green object in the diagram to represent the ...
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1answer
126 views

Why are the polarized caps backwards?

I'm having trouble with this circuit, It is showing capacitors to ground in two different ways. Would anyone be able to help? And could I used polarized instead of non polarized?
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256 views

What types of signals can a dynamic microphone generate?

And what design generates what type of signal property? For example there are dynamic mics with or without output transformers. Do they differ in the type of signal outputted? Do most dynamics ...
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206 views

Protecting against reverse polarity

I'm building a JTAG programmer for the old Motorola 56k devices and I want to add some circuit protection before having some boards built. I'm more of a firmware/digital guy, but here's what I came up ...
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37 views

How do I know the polarity of the resultant voltage of these two series-connected alternating voltage sources?

I was studying simple vector addition on All About Circuits, and the polarity assigned to the resultant voltage (see picture below) confused me. Link: https://www.allaboutcircuits.com/textbook/...