Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [dc]

DC stands for Direct Current, which means the flow of electric charge in a single direction. Examples of a DC source are batteries, solar panels, dynamos.

0
votes
1answer
54 views

Multimeter not picking up a resistance

I am making a set of speakers using 34.5 AWG magnet wire, and neodymium magnets to make a voice coil. For my wire gauge and required length I should have ~3 Ω (DC), 4 Ω (AC). The issue is when I ...
0
votes
2answers
61 views

What kind of magic is energizing the coils in this simple stepper motor driver?

Looking at this web page, i found a simple stepper motor driver circuit https://www.electronicshub.org/stepper-motor-driver-circuit/ The problem is, i just can't understand how it can work when the ...
-3
votes
0answers
45 views

Error code 57 on the elevator [on hold]

We get error 57 on my flat elevator. Can anyone help diagnose the cause? Thanks!
0
votes
3answers
51 views

Choosing capacitance for recifier

So I'm trying to use a couple of rectifiers. Specifically, the "NTE5326" and the "36MB120A." I've tried following videos on how to calculate for a smoothing-capacitor but to no avail. If you use ...
1
vote
2answers
79 views

How to make momentary connection on power on?

I have a mini-computer Beelink AP34 with momentary power button and I need to simulate short pressing of this button once it is connected to the power (12V DC). The reason is that it doesn't start ...
2
votes
1answer
42 views

Design of a motor SPDT switch that can be triggered by 5 V or 3.3 V digital output

Problem: I am designing the electrical system for a vehicle that has 12 brushed dc motors / linear actuators, they are driven by 6 identical dual-channel motor driver boards, that provide a maximum ...
-2
votes
2answers
63 views

How to remove 50 Hz, 100mV noise? [closed]

I am getting 100 mV noise signal at 50 Hz. I do not know the origin of the noise. What should I need to do to remove it?
0
votes
0answers
26 views

What is the DC component of the sum of phasors?

I am preparing for the written test conducted by IISc Bangalore for admission into their graduate program. I happened to come across a sample paper from 2016, I think. I am struggling to understand ...
1
vote
0answers
30 views

Protecting Copper Anode in 12V DC System

Getting to grips with cathodic protection here. If someone had a 12, 24 or 48VDC system, say solar PV and batteries, and the battery negative is earthed, this means the earth is the cathode, and the ...
0
votes
1answer
53 views

Differential Amplifier to Scale Down DC Voltage

I'm using a 3.7V LiPo to power a device that normally runs on 3V (and draws about 100-200mA). I've determined that my device can run properly if I can achieve an output voltage that scales the input ...
1
vote
3answers
872 views

Can I connect a DC high voltage booster directly to my Raspberry Pi? [closed]

I have one of these modules: Is it safe to connect it to two pins to my Raspberry Pi, directly, and turn it on by emitting HIGH on one of the pins (the other ...
0
votes
1answer
50 views

Powering a chain of 5volt sensors across 25 meters

I have 150 pcbs which are positioned across a 25 meter duct, each consuming 30mA maximum, how should I power them? A pair of 24v wire and 7805 on each board will be fine? With decoupling caps? Every ...
1
vote
1answer
88 views

Resistors in series and parallel conundrum

Three resistors of some resistance (ohms) are put in series and the measured total resistance is 24 ohm. Now, if the same three resistors are connected in parallel to each other and the total ...
0
votes
1answer
41 views

will dc converter discharge battary?

I am using a mini-360 dc-dc converter with arduino pro mini, so will mini-360 discharge battery without any load? Is it correct to use power switch as on image?
1
vote
1answer
84 views

Multiple power supply potentials

I am making a Project with an Arduino driving a stepper motor with a driver board. USB will still be connected to send commands over serial. EDIT: I am building an EggBot driver board for my Arduino ...
0
votes
1answer
85 views

5 volt power supply directly from 120 volt

I would like to use a microcontroller to drive a TRIAC (Z0103MA0,412). The TRIAC will be switching a 120 volt a/c resistive load. I would like to derive a 3 volt or 5 volt CD power supply directly ...
-1
votes
2answers
67 views

LED strip is flickering, but when I touch the data wire to the Raspberry Pi, it's almost fixed

simulate this circuit – Schematic created using CircuitLab Figure 2. Schematic tidied up by @Transistor. I have a Raspberry Pi which controls a 12V addressable LED strip. When the data wire is ...
1
vote
3answers
77 views

Eliminate AC noise from DC supply?

I have built an automatic water tank using the circuit given below: But this circuit was working well for 2 days. But after that, it triggers falsely. When a fan in another room is switched on, this ...
3
votes
1answer
89 views

How do I get rid of vehicle voltage spikes maybe a choke and capacitor filter?

My Question is: Is this a effecient way of filtering high voltage spikes? If so is the way I drawn the circuit even correct... How to size the components to work so that any vehicle high voltage ...
0
votes
0answers
35 views

Should I add a DC link capacitor between HV battery and buck DCDC converter?

My application does not require an Inverter. If i don't need the capacitor,is it still better to add a resistor to drain any other system capacitance voltage?
0
votes
2answers
31 views

Two 12v 1A DC power sources using a 1 gang switch?

I'm wondering if it is possible to connect two 12v 1A DC power sources to a single switch? And if so, how would such a schematic look like. The two power sources will then power their own things.
0
votes
1answer
46 views

Finding \$L\$ value in simple circuit

Hello and first of all sorry for posting a screen, I don't know how to make my own schematics. This is one of the excersises from previous year's electrotechnics. The formula to calculate the result ...
0
votes
1answer
61 views

What is the reason that moving iron instrument can measure both AC and DC but moving coil instrument can't?

What is the reason that moving iron instrument could measure both AC and DC but moving coil instrument can't? ( moving coil can't respond quickly as the AC changes its direction so stays at zero - is ...
0
votes
0answers
28 views

Small 12V DC-Motor Non-Linear Torque vs. Current Curve

I am currently investigating a malfuction on 12V small electric motor. it is performed torque vs. current measurements on a group of samples and some of them are showing non-linear current i.e ...
1
vote
1answer
138 views

[UPDATED, not solved]Simulating a Buck converter

Im trying to simulate a buck converter done in class to see if this fits what the theory says it would be, It must receive 110 V and send to the load around 60V and 20 A, the circuit is: And with ...
1
vote
1answer
49 views

Searching for 'ground fault' on DC power supply, 0VDC to ground

We have 3 chargers for DC power supplies (125VDC battery banks) at our facility and had a contractor come in and test them. They said there is a 'ground fault' on 2 of them in their report. The only ...
1
vote
1answer
45 views

Can I use network cable for low voltage DC power?

I'm a guitar player with a crazy idea for a 2 part bypass looper: Enclosure A is just big enough to house 4 footswitches and an ethernet jack. Enclosure B has 9V DPDT relays to route audio ins and ...
1
vote
1answer
96 views

DC Current Measurement (resolution of ~ 1 uA)

I haven't worked with electronics in a long time, and now have the task of measuring the power consumption of a low-power device I'm writing firmware for... When the device is drawing very little ...
0
votes
1answer
55 views

Is it safe to use a 19V DC adapter for a 12V input if it can provide enough watts? [duplicate]

I have a small TV which expects 12V DC at 34W. Can I use an adapter with a higher voltage rating (19V for example) as long as it can provide enough amps to satisfy the amount of watts needed by the TV?...
2
votes
3answers
216 views

How can I change step-down my variable input voltage?

Ok so here's the deal: I have a variable DC Voltage source from 0-10V. I need to step that down to a variable source of 0-3V. This 0-3V DC will be fed to an Analog to Digital converter in a ...
1
vote
2answers
85 views

How to efficiently trigger QC and convert it to constant 5V and a peak of 5A?

Introduction For a university project I started working on RGB LED Shutter glasses, which are based on the idea of a kickstarter by Macetech. However, these glasses miss some features I was looking ...
0
votes
0answers
76 views

Van conversion electrics

I've been working on the electrics for my van and wondered if anyone could help me. I just accidentally touched some foil bubble wrap insulation to a piece of the van's metal work and it started the ...
9
votes
6answers
3k views

Is it necessary to separate DC power cables and data cables?

I have had this discussion with my colleague earlier. A DC power supply is non-alternating, so the magnetic field a DC power wire generates is constant (is it?). Now, I know the rule is to separate ...
1
vote
3answers
125 views

Off grid LED solar lighting without batteries

I have 2 COB LEDs (12-14V DC, 50W, I think with 3,75 A in data sheet). I need to run them with a solar panel, it should only run when there is sunlight no batteries needed. Using a 270W panel (open ...
0
votes
1answer
66 views

DC Shunt Motor Load Loss

I have three DC shunt wound motors in series. Each motor has a coupling to a transmission. I am trying to work out (mathematically, as opposed to intuitively), what happens if the coupling was to drop ...
0
votes
0answers
42 views

Controlling a PWM'ed DC fan from 24v instead of 12V source

I have a tiny 12V which consumes ~0.07A and i was wondering if i can PWM the 12V fan with a 24V source at a 50% duty cycle through a ardunio and a mosfet. Would that work or fry the fan as the voltage ...
0
votes
1answer
54 views

Can a voltage stepper work on “negative” voltage?

I'm working on a project in which I need to supply 2-7 V using a 5 V micro controller in order to power a torquer for a satellite project. Since I want to be able to use the same torquer to turn in ...
4
votes
2answers
182 views

DC input on op amp integrator

I am trying to integrate a DC tension with a classic op amp integrator. The problem is : when I simulate my circuit on LT Spice, the output will always be equal to the VEE tension of the op amp ...
0
votes
0answers
31 views

Pickup up DC polarity

We currently have an issue with a project. A client fitted larger motors for windows than specified. We are sending out 12vdc from a BMS interface to open / close with reversing polarity. The new ...
0
votes
0answers
20 views

building real simulation in multisim(NI company) of dc-dc SEPIC convertor

hi I am trying to build real simulationin multisim of dc-dc SEPIC convertor how ever in my output voltage i get a lot of RIPPLE . the problem is that I get a lot of spikes in my capacitor current . ...
2
votes
2answers
71 views

Standard Powered Female DC Connector

Is there a standardized female DC jack designed to provide power, much like AC female wall outlets? Typically devices that require a DC power input are powered by individual external power supplies (...
0
votes
2answers
105 views

Am I safe working with a power supplier of 12 DC connected to the AC wall socket main line?

I'm working on an electronic home experimental project. But I have always been afraid of the issue of electricity since it can electrocute. My question is.. Am I safe working with a power supplier ...
0
votes
1answer
41 views

How to power a dc fan (4wire) [closed]

I have intel dc 12v cpu fan (removed from a computer) that has 4 wires (Black Yellow Green Blue) (Model E97379) [Photo- http://www.filetolink.com/c50ea25682 ] I want to power it by ac to dc 12v ...
0
votes
1answer
41 views

What does the ripple frequency of a buck converter indicate and how does it affect the DC device connected to its output?

What is the desired ripple frequency for buck converters connected to computers, networking device as power supplies? Can we judge the quality of power supply from ripple frequency? (buck converter ...
0
votes
3answers
56 views

AC rocker switch on a DC circuit

I ordered a set of DC rocker switches that were advertised as "4A 12V DC SPST" I was planning on using one to power an Arduino based project using 5V DC which will draw no more than 1 to 2 amps. ...
0
votes
1answer
73 views

Galvanic DC-DC isolation without inverting/rectifying

Is this possible? I have a 12V regulated supply that I need a 36V and 5v (100W total) supply from to power a peripheral and power the control circuit for said peripheral. This peripheral uses a piezo ...
-1
votes
1answer
55 views

Connector Identification

I'm trying to identify the kind of connector I need to repair it, and/ or the connector pin. I can't track it down on digikey, pictures attached.
0
votes
2answers
65 views

DC motor characteristics

I have a PM DC motor. I am controlling the motor speed using PWM. I wanted to know what is the relation between the torque vs dutycycle and speed vs dutycycle for the motor( given the fact that the ...
1
vote
3answers
116 views

Can I use a 12v 20A DC switch for a 24v 10A DC load? [duplicate]

simulate this circuit – Schematic created using CircuitLab I have a toggle switch that is rated for 12v 20A (240 Watts) and I have a load from a battery that I want to turn on or off with this ...
-5
votes
1answer
47 views

AC/DC power supply module with 20mA output current

i want get 20mA current with 24V ac to dc. I have found this power supply module with 6-9A output current but i need max 20mA. What can i add with this module to achieve my settings? I am powering ...