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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360 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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43 views

AC/DC Converters in Series with the Same AC Source

Would it be safe to connect two identical AC/DC converters in series if they share the same AC source? My concern is that the negative DC output is grounded somewhere in the converters causing the ...
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89 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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41 views

Cascading/multiple voltage dividers

Could someone explain the voltage readings on the following "oscilloscopes" of the simulated schematics below: (I understand the concept of a voltage divider but it seems something less ...
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29 views

Why is idle current in DCM lower than in CCM in DC-DC converter? [on hold]

I am currently working on a DC-DC converter and was determining the right load point to switch between DCM and CCM mode, when I noticed that in DCM the idle current is 0A, while in CCM it was ...
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70 views

Adding DC voltages of PSU [on hold]

I need to add two voltages together that share a common ground (power supply from computer). I tried using bridge rectifiers and Op-Amps.
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2answers
60 views

Controlling DC fan with Mosfet PWM

I am trying to control a 12V DC fan with PWM using an IRFZ44N MOSFET. However somehow the fan is not turning on and off when the gate is pulled to either 0V or 5V (on the power supply). And it is ...
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2answers
69 views

Motor freeweeling and regenerative brаking FOR DUMMIES

The project I'm working on is an electrically powered vehicle. I have found this fairly simple circuit to control my motor's speed. What I understand is that when the transistor is closed the battery ...
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38 views

Can I solder in an armature wire with a minor knock? [on hold]

48v DC motor The wire was damaged but has not snapped the wire, am I going to be able to fill the gap with solder and save replacement?
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1answer
79 views

Is it possible to patch together a DC system with these random materials? [closed]

I have a small collection of random batteries and solar panels, plus two charge controllers. I am hoping to build a system which can charge devices like phone, tablet, portable power banks, etc. (...
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1answer
21k views

What to do with third contact in DC barrel plug with only two input contacts

My AC-DC adapter gives output of 12V and GND. I tried to search for suitable DC barrel plugs and found that most of them have three terminals So, pin 1 is positive in my case. 1. Which pin should I ...
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45 views

Protection Devices in DC ciruits

I am putting together a design for a custom Electrical panel. The panel consists of mainly DC powered components (Sensors, Controllers). Components are to be mechanically positioned using a DIN rail. ...
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79 views

Diagram shows four wires coming from my two wire power supply, what am I missing?

Completely new to electronics and I’m trying to follow a blog post to wire up a linear actuator to a dpdt relay and photocell. I’m stuck, because the diagram I’m following is showing a total of 4 ...
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60 views

Meaning of firing angle in the context of a DC input supply

I've learnt the meaning of firing angle only in the case when the input supply is AC. As shown below So what does firing angle of 60,120,180 degrees mean when the input supply is DC? Like in a six ...
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1answer
548 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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3answers
144 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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24 views

DC charger Control Unit [closed]

I would like to develop a DC charger for my EV, according the CCS and for the Control Unit, I am not sure what type should I choose: The interface between the Power Control Unit and the Control Unit ...
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2answers
65 views

What DC Power Supply Do I Need To Get For This Device?

I recently bought a small 3 to 1 HDMI Amplifier Switcher. It can work without power adapter only if the 3 HDMI inputs are connected and supplying current. I want to operate it with only 2 input which ...
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2answers
4k views

How to tell if brushless DC motor is wired delta or Y?

I have a brushless DC motor I'm working with, do not have any spec. sheets for it. How can I determine if it's wired in delta or Y formation? There is nothing on the label that indicates this. Here'...
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1answer
32 views

Non contact AC voltage detector resistors

In this non-contact AC voltage detector, I understand the working principle of taking a tiny induced current in the antenna and amplifying it using transistors. However, I do not understand why the ...
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3answers
145 views

How is it physically possible that there is no voltage drop across two pins of this DC jack?

I have a DC jack with three terminals. Terminal 1 is tip (+), terminal 3 is sleeve (-), and terminal 2 is a switch, my understanding of which is such that if there is no adapter plugged into the jack, ...
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1answer
90 views

270v DC current limiting circuit

I have looked through some of the current limiting responses, but don’t see any close to what I’m working on for my project. I have an EV system running in around 200 - 270V DC. I want to build a ...
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1answer
96 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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1answer
43 views

Can I connect multiple bare wires to one DC Power connector?

I need to install a HDCVI CCTV system which comes with 4 male DC connectors )left in the image below) and 1 female DC connector (right). Supposedly, the 4 cameras the system has all use the same power ...
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89 views

Reducing 3v supply to run 2.4v laser diode

I am setting up a laser trip wire system, this question revolves solely around the laser itself. IMPORTANT: The laser is always on (it will have an on/off switch) Supply voltage is 3v (2x aa's) ...
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68 views

Current flowing in an open circuit to make it the same voltage

I've tried to research this answer for quite some time but i'm struggling to find a proper answer. I think my question falls between antenna theory and batteries. So in a dipole antenna we supply a ...
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2answers
4k views

Is this 400V capacitor rating for DC or AC?

I am fixing my mom's flat hair iron, I already figured out that problem is in one capacitor which should be 470nF, but currently has only 200nF capacity. It is rated for 400V, but I do not know ...
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130 views

Best way to power 120 VAC fog machine with DC?

OLD: I have a 120 VAC 400 W fog machine. I want to mount this on a robot that can supply 12 volts. Can I just reuse a $10 car inverter from Amazon or is there a better way to do this? UPDATE: So I ...
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22 views

Combined 25V/OPEN and 25V/0V Input circuit

I am designing a board for digital inputs in which I will be receiving 2 types of inputs, 25VDC/OPEN and 25VDC/0V, 10 inputs each. The input signals have different specs but is it OK to design same ...
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1answer
59 views

Safe to use a common return for multiple DC power supplies?

I have four 12V DC power supplies powering four separate loads (12V LED light strips). Is it safe to use a common return path for all four loads? simulate this circuit – Schematic created using ...
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2answers
103 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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2answers
95 views

Fuse Protection inline with DC Brush Motor

I have run into a number of instances where my 12A DC brush motor (linear actuator) is being overloaded. I have tried fusing it with a 10A Blade Fuse as well as a 15A Blade Fuse. In both instances, ...
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2answers
64 views

Is it safe to wire an AC-DC adapter directly to a DC motor? (with this setup…)

I just wanted to check that this setup is safe as I am not an electrical engineer, nor am I experienced... I am using an AC adapter which outputs 12 volts DC. It has a max current rating of 6 amps. I ...
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1answer
36 views

OK To Use This Male/Female Jack Combo For 24 Volt DC?

I'm using 24 volt DC motors along with 12 volt solenoid actuators for a installation piece. For ease of install and maintenance, I want to wire each motor with a barrel jack like the one below: ...
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1answer
89 views

Help me identify the adapter plug

Which type of connector is it? DC, 4 pins, a plug (cable side, not board side) with 4 female sockets. It resembles a Kycon 4-pin DC connector but reversed. It is taken from FSP's AC/DC adapters and ...
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1answer
91 views

boost converter to high voltages (20kv+)

I am interested in making a mini, potentially portable ion thruster. The Question: Is it possible to create a boost converter that takes low voltage batteries ranging from 3.7V to 24V and boost that ...
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3answers
442 views

Replaced 4x AA battery with 6V 3A DC adapter, but device won't work

I'm hoping you smart folks can help me. I'm puzzled by what I thought would be a simple DC battery to DC adapter swap. The device I'm trying to mod is a a microchip activated pet door (SureFlap ...
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2answers
82 views

Will a parallel capacitor short a resistor?

In the configuration above, SOL_IN is the rectified output of a solar panel (so dc). What's more important is R1, which is a low resistance sense resistor used to measure the current from the solar ...
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1answer
107 views

Help needed to identify pins of power supply

I could find no schematic nor data sheet online for what appear to be DC power supplies. There are two terminals on the smaller ones labeled output +, -, three pins labeled input 1, 2, 3 and a lone ...
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59 views

How to adjust speed on a 12v DC gear motor (what motor do I need)

First off, I have no idea what I’m doing, treat me as though your trying to explain this to a child.. I want to take a DC motor, run a shaft (2-3ft) down to a pulley, then run a belt around that ...
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3answers
55 views

Adding small AC signal to a DC current using inductive coupling

Is it possible to add a small AC current on to a DC current in a wire using inductive coupling from an external source. Or if there is another way, I want to add AC ripples to a DC current. simulate ...
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1answer
4k views

DC generator without permanent magnets

I have heard that there are DC generators where resistance can be regulated by using electro-magnetic field. Where permanent magnets are substituted with electro-magnets. Are this kind of generator ...
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5answers
96 views

Detecting if 120v AC wire is live with a 2 or 3 VDC line

For a background, I have 3 DPST bistable (latching flip-flop) relays that I have 120VAC input and 2 outputs. On one side, I have a 120VAC appliance. On the other side I need to find a way to feed it ...
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6answers
481 views

Why can't my 555-based DC-DC boost converter supply even 3 milliamps at 12V?

I hope someone can help me. I've been tearing my hair out for the past couple of weeks trying to make a simple DC-DC boost circuit. It puts out a nice 12-ish volts when not loaded, but as soon as I ...
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2answers
23 views

DC Fault Characteristics of a Voltage Source Converter

According to this paper, the three stages in the DC Fault characteristic of a VSC are Capacitor-Discharge State (Natural Response) Diode Freewheeling Stage (When source AC gets disconnected and \$...
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1answer
61 views

Will this High Frequency AC Signal Generator Circuit work?

I am going to make a variable DC to AC (10-100kHz). The circuit controlled by 2 PWM Signal from microcontroller to drive NMosfet connected to pull signal from two Ferrite core Transformer primary ...
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5answers
88 views

How Can I connect My Solar Power System? [closed]

I brought this 50A Solar Controller now I want to connect an inverter to it and they said to connect the inverter directly to the battery. I also brought a 100W Solar Panel and MC4 Wires, etc What ...
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1answer
52 views

Connecting two motors in series [closed]

I have a 240-volt mains supply and I want to run two identical BLDC motors rated at 120 volts each. Without the need for a transformer with just the help of IGBTs and inverter can I run the motors? ...
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3answers
63 views

What connectors should I use with 5V DC current?

In a personal project, I need to power several 5V appliances which, together, use up to 12A. I want to use a 60 inch cable between a case to which those appliances are connected, and the transformer ...
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2answers
271 views

How to reduce noise in this circuit?

I'm using a Raspberry Pi in a circuit I'm building that includes a few elements. Elements in the circuit: PWM driver to control 3 servos Mic board for recording Class D Amplifier that drives 2x3W ...