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.

Filter by
Sorted by
Tagged with
0
votes
1answer
1k views

Flip polarity on Darlington Tip120

I have an RC Car that I tore apart and I am attempting to rig it to an arduino. The front wheels can turn left and right based on which way the current is flowing and the rear wheels will go either ...
0
votes
1answer
48 views

Finding out capacitor polarity on pcb

I made the quintessential newbie mistake: I removed 2 capacitors (CF07/CF08) without noting down the original lead position. The interesting part is that the schematic (attached) seems to convey that ...
0
votes
1answer
83 views

Maglev Train Propulsion System [closed]

So I'm trying to make a small Maglev train for a science fair project. I understand how to make the train levitate, but not how to make it move forward. When I look online, everyone explains how you ...
0
votes
3answers
144 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 ...
0
votes
1answer
59 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 ...
0
votes
1answer
132 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 ...
0
votes
2answers
259 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 ...
0
votes
2answers
125 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 ...
0
votes
1answer
238 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 ...
0
votes
2answers
131 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
0
votes
3answers
467 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 ...
0
votes
1answer
161 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... ...
0
votes
1answer
212 views

How to protect my DIY bench power supply from reverse polarity?

I have been playing with arrays of 18650 batteries for the last 10 months, charging and discharging them all the time with my LM338K based power supply, that, until tonight, where I inadvertently ...
0
votes
1answer
216 views

How does the lead polarity work on a D'Arsonval galvanometer?

Following an illustration of D'Arsonval movement such as the following... I notice that the N polarized part of the coil is connected to the positive lead and the S polarized part of the coil is ...
0
votes
4answers
2k views

Using limit switches to reverse circuit polarity

I am designing a linear translation stage that will be driven with a DC motor. When the circuit is powered the DC motor will start turning in either direction, which will move the linear stage towards ...
0
votes
1answer
739 views

Preventing reverse polairty in NiMH batteries

So, I am powering The Device. It's low power, running at <10mA. Minimum voltage required is 3.5V, so using NiMH rechargeable batteries you need 4 in series. My problem is that they discharge, ...
0
votes
4answers
515 views

Rapid Reverse polarity

This is the circuit for reverse voltage protection, R2 is the load of a motor. The problem is that there is a test where the changing of polarity is very fast ( <5ms) and the MOS burns. Power ...
0
votes
2answers
962 views

Why is the voltage more in case of same polarity during a polarity test of induction motor?

I was performing experiment in the lab of my university. The experiment was supposed to be performed on a squirrel cage induction motor. But I performed it on a three phase slip ring I.M with its ...
0
votes
1answer
629 views

DC Motor circuit polarised 2 directions switches

I'm totally new to electronicS and do not understand a lot and I've read other posts but people seem to be asking different things to me so apologies in advance if this has been covered but I've typed ...
0
votes
1answer
721 views

Capacitor polarity and overvoltage

after watching few videos on YouTube with exploding capacitors i decided to learn few things about the polarity and the voltage rates by trying to make a capacitor explode. I made few test to try on ...
0
votes
1answer
217 views

Isolating polarities on a series wired battery bank

Can anyone, with 100% certainty (that means you know what you are talking about) tell me how to "isolate" the positive from the negative posts electrically in one direction so I have a true 'positive' ...
0
votes
2answers
2k views

Using a pulse-width modulated signal to possibly reverse polarity

I'm trying to help an artist control a simple DC motor using a single signal. The signal is a digital output, 0/5V, and the motor runs with max 36V. The motor needs to run forwards and backwards. ...
0
votes
1answer
543 views

Making dc barrel usb cable and can't find the positive polarity

I have found out that my dc barrel is tip positive. after cutting the the barrel I realized that there is on insulation inside the black insulation itself to identify which one is positive and which ...
0
votes
1answer
37 views

Low voltage control for actuation analysis. How to do it?

I would like to create a circuit, where I can modify the output voltage between -5V to +5V such I can customize values between this interval, like -3.2 V to +1.4V or -1.0V to +1.0V etc. Is it possible ...
0
votes
1answer
47 views

Switching polarised capacitors in a guitar effects pedal

I'm building a basic guitar distortion pedal, the Two-Transistor Fuzztone from the book Snip, Burn, Solder, Shred. I want to add a multi-throw rotary switch to select between input capacitors, and so ...
0
votes
0answers
31 views

LTC7001 Mosfet Driver is not working because of DPDT Relay

I am using a mosfet driver(LTC7001) to drive a mosfet. The mosfet is conducting 28 V continously which means its driver is always open. In a step I must reverse polarity of load by using a DPDT relay....
0
votes
0answers
108 views

Capacitor put the wrong way by manufacturer - is this on purpose or is this a problem?

I am about to change the electrolytic capacitors of a Soviet Selena radio from 1988. I noticed that a few of the capacitors are put with the oposite polarization in respect to the board, e.g. this one ...
0
votes
1answer
35 views

DPDT switch to control DPDT relay

this is a bit of a long shot but here goes. I need to buy a speed controller for an electric ride on car and I've had no success in finding one with a reverse polarity switch and one that also ...
0
votes
0answers
41 views

front and back LCD polarization film angles

I've taken apart an old dot matrix LCD because the polarized films are burnt. I removed the old ones and ordered a 10x10cm sheet (https://www.aliexpress.com/item/32804985320.html). I read that ...
0
votes
1answer
29 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 ...
0
votes
2answers
79 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 ...
0
votes
1answer
42 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 ...
0
votes
1answer
382 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 ...
0
votes
1answer
98 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 ...
0
votes
0answers
196 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/...
0
votes
1answer
1k 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=...
0
votes
0answers
97 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 ...
0
votes
4answers
95 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 ...
0
votes
1answer
40 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/...
0
votes
0answers
83 views

How to connect a generator and LED device of different polarities?

I have a device that generates light impulses when connected to a LED device. The intensity of the light is regulated by a potentiometer, within the generator. There are 2 independent channels. The ...
0
votes
0answers
84 views

How is a power cord connector polarized?

For example, the common PC power cord cable (IEC 60320 C13). How is it polarized if you can just switch the power plug upside down (EU)? Does it have any internal circuitry?
0
votes
0answers
365 views

AC L+ and N- difference

Hey guys i'm on a project in which I have to use Safety Modules. I'm confused with the pin-out diagram of the safety modules. They reference L and N lines of an AC source. I'm leaving you the data-...
0
votes
1answer
97 views

how to mark polarities to write loop equations

Need a help to mark polarities to get loop equations or any other method get equations without marking polarities. simulate this circuit – Schematic created using CircuitLab
0
votes
1answer
317 views

+ve & -ve vs 5v and GND

I am learning hardware form a software background (playing with Arduino) and I am having difficulty remembering absolute wiring basics. Bu board has a 5v and gnd pin, whilst my component has + & -...
0
votes
1answer
55 views

Side effect of dielectric polarization

Sorry for my obvious question, but I am not from the field of electronics and electric engineering. I was reading this article: The first sentence in the introduction says: " All solid ...
-1
votes
1answer
772 views

Polarity of of capacitors

I understand that similar questions have already been asked but haven't been able to apply them on my problem. I am working on Double integrator circuit as below (to simulate a physical system for my ...
-1
votes
2answers
99 views

Polar capacitors and a lack of jargon

Today I found myself wondering something about capacitors, and though my first reaction was to turn to Google, I also discovered that I don't know how to word my inquiry without getting ten thousand ...
-1
votes
4answers
2k views

How do I figure out the correct polarity of a DC barrel connector

I'm in the U.S. and I bought a digital wall clock from the U.K. which came with an AC adapter with input 230V/50Hz/90mA and output 9V/800mA. Now I could get a transformer to convert 120V to 230V but ...
-1
votes
4answers
14k views

testing wire polarity with a multimeter [closed]

I have a power cord that is supposed to supply an appliance with 12V D/C power. The power cord has positive and negative leads. One lead has the typical writing on it which could identify it as the ...
-1
votes
1answer
175 views

Single phase transformer [closed]

What is the difference between additive and subtractive polarity of transformers ? Why are they different in different transformers ?