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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14 views

Can I solder in an armature wire with a minor knock?

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
17 views

Motor freeweeling and regenerative breaking 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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34 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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77 views

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

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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39 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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2answers
62 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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2answers
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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24 views

DC charger Control Unit [on hold]

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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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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2answers
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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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
62 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
88 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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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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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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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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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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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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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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73 views

How does DC braking stop an AC motor without considering current direction?

When a motor is coasting to standstill, if I apply a DC voltage across the windings I will brake that motor... We'll at least that's what I've read. Now here's the thing. With reverse current ...
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105 views

DC boost converter output voltage problem when load is connected

I have successfully finished one part of the DC converter. Now I came across a certain problem which I can't solve myself. When I didn't connect a load to the output of the dc converter, there was ...
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6answers
480 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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1answer
97 views

When oscillating a piezo, should I use AC or DC square wave?

I have several piezoelectric stacks that I am trying to get to shake/oscillate. An example of what I mean by piezoelectric stack is something like Thorlabs PA3CEW. The drive voltage is specified as ...
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92 views

Can I use diodes to protect power supply outputs?

(Note, this is my first question on this site, please point out if there is something that I am doing wrong here.) I have a thyratron that requires two separate power lines to attach to it. The two ...
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1answer
78 views

Maxwell Equations for modeling a DC Motor

I have seen so many videos about this and none helped me. I can't calculate B. (equation:\$ E = 2*N*area*B*cos(\theta))\$. I mean... when I calculate the field B, I find high values for the current. ...
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33 views

Second Opinion for Finding the Power of Each Element in a Linear DC Single-Loop Circuit

I have been recently trying to solve problems from a book entitled Engineering Circuit Analysis by Hayt, et al.. But I have come to a difference in answers concerning power calculations when solving ...
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1answer
23 views

DC current surge suppression

How can I reduce or supress the in-rush current for an inverter? I have a pair of 100 watt solar panels feeding into a solar regulator (TPS 1230) which is connected to a 12v 100 Ah lead acid battery ...
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1answer
33 views

STM32F0, DRV8840 and GPIO Problems

Today I tested a DC driver with a STM32 MCU. The schematic is like this: I have a problem with the ENABLE Signal between the DRV8840 and the MCU. When the DC Motor is disconnected, I toggle the EN ...
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1answer
23 views

I want to handle the voltage and current spikes from inductive load of 220V AC ceiling fan

I am trying to regulate speed of 220V ceiling fan from Arduino but unable to handle the reverse voltage and current though I am applying the flyback diode across inductive load.
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1answer
53 views

DC Boost Converter stepping up voltage very slowly, if any

I've come across DC boost converter and told myself - why not to try it as well? So I started building a simple circuit which includes BD243C NPN Transistor, ATTiny13A programmed to give some pulse to ...
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2answers
39 views

Help with solving this DC circuit

]2 I tried KVL, KCL and the standard stuff (My knowledge goes up to Super-nodes and Super-mesh) but I have no clue what the 4V source is actually supposed to do? Sorry if the answer is obvious, but I'...
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3answers
103 views

MT3608 gets very hot only handle 1A

In the datasheet they mention the MT3608 can handle up to 2A however in some stress tests with a load tester it gets already very hot at 1A. It is so hot, it is impossible to touch the board, all ...
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54 views

Limiting voltage

I'm working on a project that takes a user supplied voltage to measure values with an adc. I need to find a way to limit the max voltage input to the device to 5v max DC. How can I accomplish this?
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1answer
43 views

Connecting negative terminal of DC power supply to negative terminal of other DC supply

I'm wiring up an electrical box that has several sensors, relays and a PLC. The PLC and relays are powered with a 24Vdc power supply. The sensors, which provide an analog input to the PLC, are powered ...
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2answers
101 views

DC on op-amp input, audio amplifier

I have built the following audio amplifier circuit on a breadboard. The circuit works. However the circuit makes a DC offset on the non-inverting input of the op-amp. simulate this circuit – ...
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57 views

DC/DC Buck Converter PCB Layout Help

Most examples I find are for buck converters on a PCB of their own with massive traces. I want to make sure this layout is fine with the planes I'm using(both top and bottom copper pour layers are GND)...
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1answer
37 views

Amplifier Voltage

I'm studying for my electronics exam and for this particular problem I have: Av = –85 (V/V), Ap 21 (dB) power gain, Ap = 3.41 (W/W), L+ = +9 (V), L- = -6 (V). Now the next exercise asks that: ...
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2answers
51 views

Recipe for Stepping Down DC Voltage from 19V to 12V w/ Low Inrterna Resistance

I need a good 12V power supply from time to time. There are a lot of good laptop power supplies around that can give out about 5A. Is there a good, proven recipe out there that can do the voltage ...
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28 views

buck or booster converter, difference between R RL load

I understand the concept of buck or booster converter but I can't find source about what changes if the load is rl instead of just R. Could you help me to see what changes in the characteristics? At ...
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2answers
25 views

TB6612FNG DC Motor Driver Low Current Problem

I have a TB6612FNG pololu DC motor Driver (datasheet), and pololu 488:1 6V DC motor (motorPage). It is clearly stated that motor has 2.9A stall current at 6V and driver has 1.2 continuous current and ...
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35 views

Low DC power consumption: RMS or mean?

I've been measuring low DC-powered devices consumption, by measuring the current at the needed frequency (able to detect the fastest consumption changes). I can then have the mean, max, min. To get ...
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48 views

DC Motor control PWM [duplicate]

I need to vary the speed of a DC geared motor using software (Raspberry Pi SW GPIO). The motor is 3 V DC geared micro motor @150 rpm. At 3 V full 'speed' the motor is very powerful for ...
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2answers
67 views

Can I run 24 V DC fan with on 18 V DC? [closed]

I have got a coffee machine which had its cooling fan died. The current fan is 18 V DC but the only replacement fans I can find are 24 V DC. Will that be a issue ? Thanks.