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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.

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How “safe” is it to put a higher voltage into a small DC motor?

The main board in my old rechargeable philoshave failed. Not wanting to give up easily, I soldered direct onto the DC motor (as pictured). The motor is rated for 3.6V (pictured), but I get a much ...
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294 views

LM2596s-Adj dc to dc buck converter

Does the schottky diode current rating affect the performance of a dc to dc buck converter when loaded? Im using a 1N5822 shottky type instead of a 1N5825 on a National Semiconductor LM2596s-Adj based ...
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28 views

Electric Scooter Motor [on hold]

I have a Motor which I got from a friend who stupidly tried to take it apart and i think he cut the four large winding wires which are actually eight wires soldered together. I have been trying to ...
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2answers
155 views

DC/DC converter in parallel with analog circuit

I have a DC/DC converter that takes 6.3 V and converts it to 900 V. I am attempting to run it in parallel with an analog circuit that runs at 12 V (see below). Without the analog circuit in ...
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1answer
56 views

Limiting current draw from a power supply

I have a power supply that can supply around -60 kV DC and 10 mA. This power supply provides energy to a device known as a fusor. A fusor utilizes a low current and a high voltage to ionize a gas and ...
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32 views

DC permanent magnetic motor control issues

We have a 180 V dc permanent magnet motor. When engaging the control board while the motor is hooked up. The output to motor drops out and reads no voltage. If I take the motor leads off the ...
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1answer
48 views

Can I use DC to run an AC device in some cases? [on hold]

I think there may be devices specified to use alternating current (AC) which can run supplied with direct current (DC) instead. There are devices which depend on AC in some fundamental way, like a ...
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1answer
72 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 ...
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93 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 ...
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46 views

Error code 57 on the elevator [closed]

We get error 57 on my flat elevator. Can anyone help diagnose the cause? Thanks!
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58 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 ...
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2answers
87 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 ...
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11k views

How do I power/wire something that is rotating constantly WITHOUT extra batteries?

So I want to make a Lazy Susan that is rotating constantly in one direction. I also want to have some other things on top such as neon signs, moving things, and etc. Problem is I want this to all run ...
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1answer
622 views

What is this part? PN:R19F 2E

Mystery Encoder I think this is some sort of rotary encoder, but it doesn't seem to act like one (no quadrature output from the pins). Tests I've run: 5V input in each pin, monitoring the other ...
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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 ...
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2k views

Why is there a capacitor in parallel with this fan? What is the benefit?

(source: electronicdesign.com) I understand that capacitors store charge, however this circuit is supposed to be a proportional controller. I just dont see why the capacitor is needed. Perhaps to ...
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1answer
43 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 ...
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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?
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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 ...
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1answer
518 views

How to Find Angle of Armature Current

Two identical three-phase, Y-connected, synchronous generators are connected in parallel to equally share a load of 900 kW at 11 kV and 0.8 pf lagging. The synchronous impedance of each generator is 0....
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1answer
54 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 ...
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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 ...
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873 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 ...
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2answers
23k views

Diode circuit analysis using ideal diodes exam problem

I've been reviewing some past exam and stumbled across this question So I need to find the current I through the middle diode and the voltage across the bottom left 10KΩ resistor. To try solve this ...
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1answer
3k views

Transmitting 12v DC over a long wire

I'm trying to charge my laptop through a 12V battery and 12-19V adapter over a long wire but I've noticed that the adapter makes some noise and doesn't work. On the other hand when I connect it close ...
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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 ...
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3answers
42k views

What does RU (UR) label on DC power relays mean?

I'm trying to figure out what does RU or maybe UR label mean on the body of many many relays. It's labeled almost on all (I've seen so far) DC relays which make me very curious :). Any suggestions?
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1answer
134 views

Correct way to do “power injection” from multiple DC supplies?

I'm using a PixLite controller to run a bunch of pixel LED strips. Since I'm sticking to 5V I need to use multiple power supplies (PSUs) to "inject" extra power for the number of LEDs I'm running. ...
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1answer
51 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 ...
3
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1answer
90 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 ...
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2answers
84 views

Controlling 12V 12A DC Pump using PIC

For part of my project for college I have co control a 12V DC pump which requires 12A. I was wondering what is the best solution for allowing the PIC to complete this as the output from the PIC is ...
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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 ...
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2k views

Raising Alternator Voltage

Does anyone have a good idea on how I could raise the voltage from a 12v car alternator to 48v dc for use in a 48v wind system? Could I put a dc negative voltage of 36v into the regulator field ...
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930 views

H4 Led headlight AC to DC conversion module (plug&play) can it be done with 2 rectifiers?

Recently i installed an h4 led kit on my moped but normaly the led should run on DC and not AC so i tried using 2 rectifiers but then it powered both the high and low beam (2 different wires(blue and ...
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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?
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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 ...
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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 ...
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3answers
81 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 ...
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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?
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3answers
25k views

How do the tiny AC->USB power supplies work?

The iPhone and Kindle both come with tiny power supplies that take in 120v AC and output around 5V at 0.85 to 1 amp. They seem to be too small and light to have a transformer, and generate very little ...
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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 ...
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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.
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2answers
899 views

How does this circuit give DC output?

I don't understand how this circuit works. I'm not sure if it's correct. It should give a DC output, but how would it do that?
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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 ...
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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 ...
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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 ...
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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 ...
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1answer
69 views

AC - DC Adapter Question

This may sound silly to most, however, it answers a million questions for me, so please have mercy on the down voting, thanks. A simple example without specifics, when a battery and a DC motor are ...
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1answer
99 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 ...
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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 ...