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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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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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2answers
32 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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0answers
45 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
58 views

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

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.
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1answer
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Controlling DC Motor with stepper driver

I only have a stepper motor driver TB6600 available at the moment, can I use it for control of a a brushed dc motor? I think it should work as I could use PWM. I also want to be able to reverse ...
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28 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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2answers
78 views

Dc Motor giving ac as well as dc voltage when used as generator

When I rotate the rod or the moving part of motor and probe its output through a multimeter (set on ac measuring) it shows around 0.50 volts. When I set the multimeter on dc measuring, it still shows ...
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1answer
34 views

Switching Power Supply - Inrush Current, Input Current, MCB

I am getting several PSUs (LRS-350-24) from Mean Well. Here's the specs: https://www.meanwell.com/Upload/PDF/LRS-350/LRS-350-SPEC.PDF 1) The input current is stated to be 3.4A/230VAC at 88%. 350W ...
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1answer
44 views

Powering 4.6 V with 5 V USB power supply

I need an output of 4.6V 900mA from 5V USB power supply. The smaller the better, what is the best way to achieve such conversion. I want to mod Nintendo DSI XL to charge it using USB micro. Case says ...
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0answers
62 views

Diodes used with MOV, which ones and why?

i was hoping to get some help identifying a component on an old circuit board that i have to repair, id also like to undertand the purpose of this combination of components. The circuit is on an ...
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17 views

Making a common ground connection between a DC power supply and a waveform generator(33120A)

I would like to use a DC power supply to as a source voltage to a sensor and a waveform generator(33120A) to give another input to the sensor. I would like to know how can I make a common ground ...
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1answer
157 views

How to measure high DC voltage by micro-controller with an integrated approach?

Goal is to measure DC voltages in the 100-500VDC range, safely with a microcontroller (e.g. Arduino) The particular application is to monitor the voltage of a large Lithium series parallel battery ...
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54 views

What can I add to a DC circuit, to limit the voltage to 24V and current to 16 amps?

I have a battery pack that can put out around 25V and 20 amps, but it needs to be limited to 24V and 16 amps. Update: This is a follow-up to my question from yesterday: Protected 18650 batteries ...
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3answers
126 views

How can I run a 6.5V-100V power meter on 5V?

I have an eBay power meter (V/A/W/Wh) that is specced between DC 6.5V and 100V. It's wired with a 75mV 100A shunt, like this: If I wanted to run the thing at 5 volts what would be the easiest way? ...
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1answer
72 views

DC Filter for DC free transmitting

I have a sine signal with Vpp = 5V, DC Offset = 2.5V. Now I am asking myself how to remove this offset in order to have a DC free transmission.
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1answer
53 views

Assembling and Dis-assembling a Charged Capacitor

If I have an electrolytic capacitor, which is a cylindrical body in which the two plates are rolled-up with a dielectric paper in between them, of very high value (say 1F) and I charge it using a DC ...
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4answers
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Will my circuit charge the battery and power Arduino?

I am currently attending High School, so I don't expect too much here. I simply want to know all the recommendations for this circuit (Capacitor values, etc). But I mainly want to know if this ...
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1answer
57 views

(230v)AC-DC(12v) wall adapter flashes when connected to dc to dc buck converter [closed]

So I used a common 230vAC to 12vDc (1AMP) wall adapter with dc jack like this and converted to 5v using a dc to dc buck converter same as based on lm2596s But the adapter LED starts blinking (...
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1answer
59 views

What is the cost of converting 12V (lead acid battery) to 220V and back again to power 12V appliances?

I have a small house measuring ~ 8m x 4.5m. It is in Indonesia and power outages are expected daily. Probably the daily power outage is on average less than half-an-hour, but sometimes the outage can ...
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1answer
27 views

switching two power sources

I have used the circuit below to switch between two power sources. The purpose was to have a backup power source once the other is switched off by a controller in the system. While testing the ...
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0answers
14 views

+24VDC to 5v converter - does the positive make a difference? [migrated]

I have a fairly general question, but cannot seem to find an answer to confirm my thoughts. I have a garage motor door, and on the top has 4 terminals - 1 and 2 for a switch button to open and close, ...
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3answers
73 views

What current should I choose in bench top DC power supply?

Most of the time while I'm doing my university projects, I find that only voltage requirements are given for building a circuit, and how much current I should supply from a bench-top DC power supply ...
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1answer
60 views

Are large pulsed currents the most deadly type of electric shock?

As opposed to sustained electric shock via DC or AC? I might be wrong, but when people are killed by electrocution it is usually due to a large current of very short duration passing through their ...
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3answers
170 views

Physics of Dirty Electricity? [closed]

I've been reading about "dirty electricity" lately and while I know there's much controversy whether it causes adverse health effects this question is not about that subject. I'm simply trying to ...
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0answers
20 views

Solar Panel (5v/500mAh) charging USB Power bank (5v/1a)

I've been trying to find information on this but haven't found an accurate answer. I have a USB Power Bank that has a max charging input of 5v/1a and a 5v/500mAh solar panel that can output up to 5-...
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1answer
16 views

Under-voltage lockout programming on Delta D12F200 DC/DC converter

I recently decided on the Delta D12F200 DC/DC converter for my current project (datasheet: https://www.mouser.com/datasheet/2/632/DS_D12F200-1141659.pdf). My project will be powered by lithium ion ...
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3answers
90 views

Audiable pops when switching DC biased audio signal

In my previous question, I have asked how to DC bias audio signal for a crosspoint audio switching matrix (Switch array (crosspoint) and DC biasing of audio signal). I am using the following circuit ...
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2answers
101 views

How to obtain 360vdc from 240vac for audio use without a transformer?

I'm in the process of creating a tube guitar amplifier with an output power of ~6w (fender vibrochamp AA764) which requires the use of 360-400vdc. How could I obtain such a voltage from mains without ...
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0answers
37 views

3V to 20V DC - DC boost converter help

I am sorry if this question has been asked before, I couldn't find exactly what I'm looking for. TL, DR: I'm looking for a way to boost 3V to 20V that: Works from a single cell lithium ion battery ...
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0answers
18 views

Noise in DC/DC Converter QHL600300S12 (180V-425V to 12V) output

We are using a DSO TDS2022B from Tektronix to check output voltage of DC/DC Converter QHL600300S12 from XP Power and were seeing 5V peak-to-peak in the 12V output power rail. What could be the ...
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1answer
34 views

Shunt DC motor controller improvement

A 1.4 A shunt DC motor, with brushes, in a home made pottery wheel from 1970s runs slightly erratically. In general I am well impressed with it as the motor choice is appropriate for the ...
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1answer
87 views

5VDC and 10VAC on the same PCB - what happens on 10V goes to 5V ground?

Me and a colleague (we are both EE-trainees) had a chat the other day about mixed voltages on the same PCB. She pointed out an interesting question that I was not able to solve. Imaging having a PCB ...
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1answer
78 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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1answer
55 views

Changing the full scale deflection of an analogue volt meter

I've bought an old pocket style (think of an old pocket watch) analogue volt meter and the full scale reading is 6V. I would like to change this to 3V, however I have opened it up and there is no (...
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2answers
85 views

Can I add output capacitance to a dc/dc boost converter to help with current spikes?

I have been playing around with achieving better power in my 30-year old RV. I want to create both AC and DC systems to provide power. This has essentially 3 routes from my battery to device: Samlex ...
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3answers
76 views

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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1answer
69 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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1answer
72 views

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

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
77 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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2answers
99 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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3answers
77 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
98 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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1answer
44 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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2answers
77 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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0answers
27 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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33 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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1answer
58 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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3answers
880 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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1answer
52 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 ...
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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 ...