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, and dynamos.
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Parallel Battery Packs-Any concerns or considerations besides diodes for used non-rechargeable AA?
A project I am working which involves an Arduino controlling RGB LED strips. To avoid overloading the Arduino, I plan to use a 5v 3A supply for 2 strips near each other (they want 1A each) but for ...
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Motor turning when limit switch pressed
first of all I'm new to electronics. I tried wiring limit switches (https://www.amazon.de/gp/product/B08734MSDD) to my motor (https://www.amazon.de/gp/product/B08GFKXB2K) so it stops when they are ...
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How this FET driver works? [closed]
Everyone, please guide me through this circuit. How this circuit is working.
The PACK+ and PACK- pins can be connected to a charger or load terminal. And the BAT+ and BAT- pins can be connected to a ...
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Can we charge a 12S LiPO battery through a DC safety switch?
I'm working on a robot that uses a 12S battery as its main power source. The problem is that wanted to add a short circuit protection and an overcurrent protection, so added a DC automatic safety ...
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Why is it OK to separate a circuit in the process of simplifying it?
Suppose the switch was closed for a very long time. Why is it ok to separate the circuit like this?
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High current, low voltage pulsed DC transformer
I'm trying to understand the feasibility of a DC transformer that takes a low voltage, high current pulse and converts it to a lower voltage, higher current pulse (with a resistive load on the output)....
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Connecting two power sources to the same load
I'm going to start with a picture to illustrate my question:
The resistor on the far right is my load (which will eventually be an Arduino or a battery which will then be connected to an Arduino) and ...
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In a DC circuit with a battery and a capacitor how do electrons on the capacitor plate connected to positve terminal flow?
In a DC circuit with a battery and a capacitor how do electrons on the capacitor plate connected to positive terminal flow? It seems the voltage between them and the positive terminal of the battery ...
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Biasing AC signal - which circuit is the best?
I've seen a similar question asked earlier here:
How do I bias an AC signal for sampling?
However, I have a 3 different circuits and I am not sure which one works best!
I have: +-2V AC signal of ...
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Why is the current flowing this way in these 2 meshes in a simple circuit?
Just wondering why exactly the current is flowing in the directions depicted in the image below? It is my (rudimentary) understanding that current flows from regions of high potential to regions of ...
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How is a DC battery’s voltage distributed across the components in an ideal wire?
If the sum of voltage drops in a circuit is equal to the battery's voltage, then how do the electrons maintain their flow after passing the voltage-dropping components if the components had already ...
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What is the best way to connect lots of wires together?
I need to power 84 12 VDC devices. Each pulls 0.5 A max. Instead of 84 wall warts, I'd like to create a DC bus with two (redundant) power supplies. What is the best way to connect together 84 small ...
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Repairing Garage Door Control Board
Update summary:
I recapped the whole board :D - It works perfectly!
Re the main/bigger cap, my local electrics shop didn't have a 330uF 35V so I went for a 470uF 35V instead.
Just for my own learning, ...
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Can a 12 VDC barrel jack/socket (female) that receives power (inlet) also be used to provide power (outlet)?
EE Experience: apprentice
Application:
There are two devices: Main device #1 contains a 12V DC (2.1A) pump powered by an AC 100/240V to DC 12V (10A) main power supply; secondary device #2 contains a ...
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Unable to start and run 12 V DC pump, only jolts
I have a 12V 19 watt DC water pump (800LPH), A 12 V DC step down converter, and two Dewalt batteries.
One at 18 V 5 Ah, other 18-54 V 9 Ah.
I've connected pump to step down to battery correctly, but ...
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Why does my voltage from the DC supply box change on its own?
I have a simple electric motor setup that spins using a simple copper coil rotating around between two metal nuts. The nuts are connected to a DC supply box (on the right) like this:
Sometimes, ...
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Load not getting correct voltage and current with the circuit
I am trying to power a DC fan (9WV1212J1002) with a 12V battery (RNG-BAT T-LFP-12-50). The path of the current will flow through three components: a 30A hall sensor (ACS712-30A), a load switch (...
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Making DC-DC boost converter 3.7 to 8 V using MC34063
I am trying to make dc dc boost converter 3.9 to 8 V using:
mc34063
https://pdf1.alldatasheet.com/datasheet-pdf/view/12072/ONSEMI/MC34063.html
100 uF 16 V capacitor
220 uF 25 V capacitor
680 pF ...
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Switching a single high-power DC source between six loads - via relays?
I need to route DC power from a single rack power supply (Keysight N5766A) to six different loads, with the capability of switching between them independently and unshorted (break-before-make) via a ...
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How to calculate capacitator voltage over time for a RC circuit with AC power source?
I know with DC power source, the voltage for capacitator is expressed as:
https://www.electronics-tutorials.ws/rc/rc_1.html
Can the same equation be applied to AC power source?
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What assumptions are made by UL when they equate 30Vrms to 60Vdc for LVLE circuits?
UL defines Low Voltage Low Energy circuits as "A circuit involving an alternating current
voltage of not more than 30 volts, rms (42.4 volts peak) or a direct current voltage of not more than 60 ...
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Old car patrol light
One of my friends has a car patrol light. He wants to use a transformer to supply power. This light has two lightbulbs, 50 watts each. The front light is red and stays on, on the opposite side is an ...
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Laptop connectors and universal chargers (tips M3, M4, etc.)
I am interested in having more information about connectors and identifiers (M3,M4,...M31) used by laptop universal chargers.
Is there any "official" list or convention for laptop ...
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Relay which opens very infrequently
I need to control a 3A 24V DC motor via a relay. The relay is not the primary means of control, its purpose is to temporarily disable the motor under an unusual condition. One that almost never occurs,...
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What can I use to convert the output wave from an inverter from a modified sine wave to a pure sine wave without much energy loss?
I use an inverter (600 W) to convert from DC 12 V to AC 220 V 50 Hz, but the wave output from the inverter is a modified sine wave, which causes problems when operating some electrical appliances (...
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DC appliances running on AC system [duplicate]
How do DC ran appliances work in an AC electrical system? For example, a house runs on AC, but the microwave runs on DC. How exactly is AC converted to DC? Does that DC power then have to invert back ...
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Transistors keep failing in dc motor controller
I feel like I'm a few steps away from becoming famous on this site with this controller but it's literally been years and I've went way too far to give up on it now..
Here is my schematic:
It uses N ...
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Designing a Circuit for Rotational Magnetic Field
I hope you're all doing well. I'm a beginner regarding building things like that which I’m going to explain now, so please include as much information as you think might help me. I want to create a ...
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Which has more power loss, long wire DC or DC with inverter? [closed]
If I have a battery 12v and want to run like 8 to 10 meter wire (use like 14/16 awg)
What has more power loss,
A.12v dc to a 12v dc bulb 10 watts
B.12v dc to a inverter 220v (1000watts it has like ...
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Chassis ground for DC power supply
Car jumpstarting is usually done according to this diagram:
What is the point of attaching the negative terminal of the donor to chassis ground instead of the negative terminal? How would that work ...
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What is the range of the most powerful step down DC/DC converters nowadays?
The team in my lab's company, we want to start using high voltage DC to perform some tests. The electric company can supply us a line of 25kV DC but in reality we would need to chop it to get voltages ...
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Regulating multiple +5V sources to one output to increase current, but avoid interference/noise
I'm designing a circuit with 4 USB 2.0 upstream ports that each connect to their own AVR (ATMEGA32U4), 1 master and 3 slave connected via I2C, master then communicates with a USB controller via SPI, ...
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Low voltage dc and ac high voltage in the same conduit
I will be powering a 12V cctv camera.Is it okay to run the cable through a conduit with 220V AC? Or will it have an interference?
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Which value of fuse should I use?
So this 12 VDC LED rated at 1.5 watts i.e. 125 mA, The LED is run by a computer circuit which sends 12 V power to LED for on and off, exactly like a car turn signal blinker.
Which value fast blow ...
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Earth ground and DC
If I understand correctly, a DC circuit powered by a simple battery would not be affected in any way by an earth ground. By earth ground, I mean a copper wire attached to the ground through a long rod ...
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How to convert a {200 VDC, 3A} power supply into a {12 VDC, 50A} source?
As title states, want to convert a high-voltage, low-current DC bus to a low-voltage, high-current DC bus that's more compatible with electronics circuits. This seems to be a pretty large input for a ...
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Open Circuit in DC Voltage Source
In this circuit with the switch closed:
It's a classic DC circuit with various currents flowing through and voltage drops across the resistors. My question is if we open the switch:
Does the voltage ...
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sizing resistor for solar fan
background; i'm an art student tinkering with solar. mostly learned from youtube and internet. i think i'm ok with hooking up solar panel with dc fan and dc light. no battery, no charge controller. ...
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Making a custom ESP8266 board
I've challenged myself to make a custom ESP8266 (ESP12S) board. I'm having a problem I cannot decipher: The PC sees the USB device, and I can successfully upload my code through the Arduino IDE, but ...
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Voltage difference between two nodes surrounding a source [closed]
In the schematic you can see I have this circuit that includes a branch leading from ground to a 10Ω resistance, a 4V DC source and up to node A. I am trying to solve this circuit using the node ...
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Using two deep cycle 12 V batteries to create a 12 V circuit and a 24 V circuit
I have two 12 V deep cycle batteries in my boat. I would like to create a 24 V circuit for my 24 V trolling motor and a 12 V circuit for my fish finder. Without purchasing an additional battery, is ...
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Are the supply voltage and differential signals put on the same connector?
I have a circular connector. Assembly card size coming from the mechanical department limits me so I must use the pins of the same circular connector for 28V DC power supply and some differential ...
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12v and 48v common ground?
Building out an RV and have combination of 12v and 48v systems. Not sure if I can share the same grounds.
My biggest concern is what happens if, for example, there’s a short to ground on the 48v side?...
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Are these coaxial power barrel male jacks compatible with this female coaxial power barrel plug?
I am going to design a PCB that shall contain a coaxial power barrel adapter for power. It will eventually connect with an external power supply like the one we often use with laptop and other ...
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Measuring power in AC
I have a heater running at 240VAC. I'm trying to measure the power by datalogging the voltage and current then multiply both inorder to get the power reading.
I know that this method works well with ...
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How to prevent interference between high voltage and brushless dc motors
I am a DIYer without much experience in electronics or electrical. I have a device that has 6 DC brushless motors spinning discs around a cube with plasma inside. The motors are were bought at ...
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What Capacitor do I need? (if any) [closed]
I have a airplane with a radio and other electronics. When I transmit on my radio the voltage drops about 0.3 volts across my other electronics and causes some sensitive sensors to read incorrectly. ...
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4Hz sinewave above ground, I want to make it an AC sinewave
I have a circuit that will output a squarewave from about 100 Volts up to 8000 Volts. It was designed to output an 8000 volt squarewave and does, but I changed the input drive from a square wave to a ...
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Missing a part from a plug for a DC car charger, don't know where to find it
I am in a predicament, I need to replace the part highlighted in blue but don't know what it's called or where to get it. The black nut holds everything inside, and it came loose so everything fell ...
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DC analysis of N-type MOSFET circuit
I need to solve this circuit as part of a past homework but I never really got to solving it as I never really quite grasped the mosfet all that well and soon I will have an exam out of this. Our ...
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