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
57 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
219 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 ...
1
vote
3answers
45 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 ...
6
votes
3answers
1k views

Electrically switching between horizontal and vertical light polarization

I would like to be able to electrically switch between horizontal and vertical light polarization. This polarization filter is supposed to be portable attachment running on a battery in front of a ...
0
votes
1answer
39 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
45 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 ...
2
votes
2answers
364 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 ...
20
votes
2answers
21k views

Does MOSFET let current flow through source to drain as it allows it from drain to source?

Does a MOSFET allow current flow in reverse direction (i.e.; from source to drain)? I made a Google search, but couldn't find a clear statement about this matter. I have found this similar question, ...
0
votes
2answers
136 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
1answer
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 ...
0
votes
0answers
24 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 ...
30
votes
3answers
16k views

How does USB Type C handle reverse polarity

The new USB Type C connector doesn't have a physical reverse polarity protection anymore. You can plug it in any way you want on both ends, there is also no A and B end anymore, it's all the same. So ...
22
votes
3answers
4k views

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 ...
1
vote
1answer
179 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 ...
0
votes
1answer
54 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 ...
6
votes
2answers
283 views

Reverse voltage protection for Analog Devices’ family of protection controllers

After going through several datasheets for devices from "Analog Devices’ family of high voltage surge stoppers, overvoltage protection, overcurrent protection, and circuit breaker ICs", I found that ...
4
votes
1answer
230 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 ...
1
vote
1answer
58 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 ...
2
votes
1answer
8k views

Troubleshooting why Powerbank Doesn't Charge Cell Phone [closed]

I have powerbank that provides 5v (presumably regulated) power, as typical of most usb interface powerbanks. I have been trying out my powerbank with different phones. It works on all except one. I ...
1
vote
3answers
138 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 ...
0
votes
2answers
84 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
3answers
174 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 ...
2
votes
6answers
1k views

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 ...
-3
votes
2answers
112 views

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 ...
3
votes
1answer
170 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 ...
1
vote
2answers
263 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?
7
votes
4answers
9k views

Aren't non-polarized plugs a little dangerous? Why still use them?

Sorry if there is an answer for this kind of question somewhere. I can't find it anywhere. Take a look at obvious toaster example: If you live in Europe and have non-polarized plug and a toaster (a ...
0
votes
1answer
112 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 ...
2
votes
3answers
353 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 ...
1
vote
1answer
64 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 ...
0
votes
1answer
157 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 ...
0
votes
0answers
109 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
596 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
1answer
345 views

Identifying the polarity of the aluminium electrolytic capacitor

I have the following device - polar electrolytic capacitor (it is/was having stripe on its sleeve): I know its capacitance and voltage rating - 2.2 uF / 400 V, but accidentally removed the remainders ...
0
votes
2answers
94 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
1answer
75 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 ...
4
votes
7answers
12k views

How to memorize a diode's polarity in symbol? (self-answered)

How to memorize a diode's polarity, such as anode and cathode in symbol?
1
vote
2answers
461 views

Slot assignment in JST SM connectors

I am using JST SM connectors for connecting two sets of wire. There are two slots in 2-pin connector. I wish to know, what is general convention for assigning the polarity to these slots? Is it slot 1-...
1
vote
3answers
745 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 ...
0
votes
1answer
53 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?...
0
votes
2answers
215 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 ...
5
votes
6answers
1k views

Determining the correct polarity of a supposedly wrong polarized capacitor

I'm fixing an audio interface (Scarlett) that was behaving poorly and found a likely culprit - a bulging capacitor. However, it appears to be soldered on the board backwards (based on the `screen on ...
2
votes
1answer
4k views

Polarity symbols on universal AC-DC adaptor

I have a universal AC-DC adaptor that has the following symbol by the polarity switch: Is it safe to assume that the top part of the diagram indicates the polarity of the inner surface of the ...
8
votes
2answers
48k views
0
votes
1answer
116 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
4answers
81 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 ...
2
votes
2answers
2k 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 ...
0
votes
0answers
73 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
1answer
124 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?
0
votes
1answer
205 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 ...