Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [power-supply]

An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.

0
votes
1answer
91 views

Is a safe 110/120VAC benchtop power tap possible?

I have a benchtop power supply that provides +3.3, +5, and +/-12VDC. I've started cannibalizing small appliances for parts, and I'd like to have similar power taps for 110/120VAC. Does such a thing ...
2
votes
0answers
43 views

Can I generate following voltage waveform with single PWM FET?

I am designing power supply which must output following voltages at a maximum of 1.5 A stepped down from a 24 V DC supply. 24 V 13-15 V 0-5 V Waveform for one of the inputs requires following ...
0
votes
1answer
42 views

How does a non-isolated SMPS work?

My understanding is as follows: For an isolated SMPS, we first rectify the input ac voltage, then convert it to a square pulse using a switching regulator. It is then stepped down using a transformer,...
0
votes
1answer
46 views

How to determine voltage/amps a circuit board expects

I'd like to add a new power supply to a board that came with 2xAAA batteries wired on. The issue is that the two batteries were connected on opposite ends of the board. I'd like my replacement power ...
0
votes
0answers
38 views

What is the point of the zero ohm resistor between LED_VCC and VCC_3V3?

I am designing a IR sensor transimpedance amplifier circuit based off of the Texas Instruments Particle Sensor (TIDA-00378). Between the separate power buses (LED,TIA,VCC) there is a connection with a ...
0
votes
2answers
53 views

Rotary switch for bench supply ammeter

I plan to build a bench supply using a used ATX desktop computer PSU, with 3.3v, 5v and 12v binding posts as well as a cheap voltmeter-ammeter combo module (DSN-VC288). I know it's going to be ...
-2
votes
3answers
146 views

Why Is There Negative Voltage at the Anodes of Two Rectifier Diodes in this Circuit?

i've been trying to figure out how this PSU in my amplifier is working by studying the schematic, and would like to check that my assumptions are correct, but also, as per the title, i'd like to ...
0
votes
2answers
72 views

Will this circuit work for smoothing out DC adapter output?

I have a battery driven touch activated kitchen faucet. I am trying to convert it to DC adapter operated one to save on batteries. First thing I tried is just hooking up a 9V 2.5A DC adapter. It ...
-1
votes
1answer
32 views

How much load for a given source? [closed]

Given a micro controller with X Volt DC power supply, what is an easy way/rule of thumb to determine how much devices I can connect to the controller (assuming each device requires Y Volt DC)?
0
votes
0answers
46 views

Cannot share power source between audio module and 555 circuit

In this post, I outlined a circuit I was building to activate a solenoid with voice using a small Arduino sound detection module (this one). The output pulses from that module are too short to drive ...
0
votes
1answer
31 views

Load Profile plot from Smart meter data

In electrical engineering, a load profile is a graph of the variation in the electrical load versus time. I am currently working on Smart meter data having reading an interval of 30 min i.e power ...
1
vote
2answers
68 views

Railway overhead lines: What happens to other two phases in single phase railway power?

This is actually two questions. As my imagination I have the German/Swiss/Austrian/Norwegian/Swedish railway system on mind (15kV, 16.7Hz). I think conceptually the problem is the same on other AC ...
0
votes
0answers
27 views

How to run 200 RPM motor on 5V Relay using NodeMCU?

The following circuit comprises of NodeMCU (ESP8266) which is intended to run a 200 RPM johnson motor. The circuit comprises of 5V Relay connected via Darlington pair using transistors. The circuit is ...
0
votes
1answer
39 views

Buffer capacitors' role in boost power supply design?

In the power supply design, there are always smaller value capacitors placed at the output.What is the main role played by these capacitors in the module? Check the screenshot attached and I am ...
0
votes
1answer
38 views

selection of power supply ( Linear power supply vs SMPS)

we know that, depending on the specification of our system, we design our power supply, which may be either a Linear Power Supply, or an SMPS. But, if there are no constraints of size, efficiency, ...
0
votes
3answers
95 views

Can a battery be damaged by charging it with wrong amperage PSU?

Can a battery (specifically a lithium-ion type that you would get in a small portable electronic device) be damaged by charging it with a 5V 1A PSU, where the manufacture specifies as 5V 2A PSU? ...
0
votes
1answer
79 views

6 volt drop to 1.2 volts

I am working on a circuit for my deer feeder. I now have a 6 volt power source running the spinner on the feeder and it has a 6 volts solar panel recharging the battery. I made a new circuit control ...
-1
votes
0answers
40 views

HDMI Cat6 cabeling - can a buildings power supply affect transmission?

TLDR; A computer and monitor works at site A, but the exact same setup fails at site B - the only difference is the power sockets used. I have a HDMI over ethernet box which allows me to use Cat6 ...
0
votes
0answers
35 views

Raspberry Pi UPS from powerbank

I have a Raspberry Pi that is fed by a powerbank which in turn is fed by a USB wall adapter, and I want to interrupt the power from the powerbank when there is current coming from the AC wall adapter, ...
0
votes
1answer
69 views

DC motor is pulsing when connected to power supply

Apologies in advance if my terminology is not exact, as I'm a very amateur hobbyist just starting out. I have a DC servo motor that I bought used, rated at 24V maximum, with variable RPM depending on ...
0
votes
1answer
87 views

Easiest (or cheapest) way to get both 5V and 3.3V on one circuit

I'm working on a circuit based on an ATTiny85 and I need accelerometer input. I was looking at using an analog accelerometer (KXTC9-2050 that runs around 240 uA) because I have the extra pin and I'm ...
0
votes
0answers
44 views

Battery float voltage of CN3722

I want to charge a 2-cell Li-ion battery with CN3722 charging IC. According to my circuit design, the float voltage at the battery terminal should be 8.4V. But, the float voltage is measured as 13.44V ...
1
vote
0answers
24 views

2 Switch Forward Converter Volt-Sec/Charge Balance

I am attempting to design a 2 switch forward converter. I understand how to do the volt-sec balance and charge balance when the converter is as shown in the ideal 2 switch forward converter below. I ...
0
votes
0answers
34 views

How to trigger power bank to output 12V? [duplicate]

I have a power bank that can output 5V fast charge or, 5V 9V or 12V regular charge. https://www.banggood.com/JUWEI-QC2_03_0-Automatic-USB-Tester-Voltage-Ammeter-Quick-Charger-Power-Bank-Voltage-...
0
votes
1answer
42 views

Problem with 2G Modem's supply power

I want to run a 2G Modem HL6528RD. I provide it with 3.6 V, got from the following circuit : I finally manage to make it work but the problem is that if R108 is mounted, the modem doesn’t work, (the ...
0
votes
0answers
24 views

OKI-78SR-5/1.5 inductor

I want to use OKI-78SR-5/1.5 but in datasheet https://power.murata.com/data/power/oki-78sr.pdf on page 19 I found Cbus and Lbus value that make me confused a little bit. I think that values only ...
1
vote
1answer
51 views

How to condition supply voltage for project

I am working on a circuit that is powered by a regulated 5V external power supply. However, since I will be directly powering a Micro-Controller from this 5v supply, I was wondering how I should '...
1
vote
3answers
133 views

Protecting a 3.3V circuit from 5V power supply

I'm designing a dev board for 3.3V parts. On the dev board, I will have a header for an "FTDI Friend" USB-to-Serial converter. The FTDI part can supply Vcc to the target board. However, FTDI parts ...
0
votes
1answer
45 views

Variable output from Power Bank (24W = 12v * 2A and 5.4W = 9v * 0.6A)

I started with trying to find 2 UPS for 2 of my routers with the following input specifications: 12v 2A 9v 0.6A I realised that buying 2 power banks will be economical than buying 2 UPS for the AC ...
0
votes
1answer
37 views

Can I use a 12V switching power supply to power a G4 LED bulb?

I'm trying to convert a broken halogen lamp to LED using a commonly available G4 bulb. I have a lot of orphaned universal power supplies from various electronic accessories. Can I use a 100-240V => ...
0
votes
0answers
44 views

Power problems related to copper wires and pigtails

I am using a battery to power a odroid which requires 5V/4A. The battery voltage when measured using a multimeter was around 26.7. I had two setups: I used a 1 sq mm copper current carrying wire to ...
0
votes
2answers
84 views

Electrolytic Cap in parallel with ceramic for Decoupling

I wanted to ask if adding a high value electrolytic cap in addition to the ceramic decoupling capacitor in a circuit would make the filtering of high frequency worse. Because electrolytic caps are bad ...
0
votes
0answers
31 views

How to properly configure parallel loads using TP4056A module

Was planning on using an array of lithium ion batteries to provide continuous power to an RPi Zero W through the 1.2A USB output step-up (left of diagram). The TP4056A module supports charging/...
-1
votes
0answers
37 views

What would happen if i apply a negative 12V supply to L293D IC?

I have one connected to arduino to drive a stepper motor. I supppied negative 12V mistakenly and my arduino doesnt work anymore. So, is my IC L293D still going to work?
0
votes
2answers
114 views

Does a Solid state relay timer exist?

I have a project which is proving to be more challenging due to my limited knowledge of electronics. I am installing a homemade central vacuum system. It uses 12 V signal from the outlets to operate ...
-1
votes
0answers
23 views

Zener Diode with series pass transistor for overvoltage protetion

I want to use the following circuit for the over voltage protection of my device having load current of 3A (max). The input Voltage is 24-30V (unregulated). Output voltage is needed is 12V (12.5V max)....
1
vote
1answer
35 views

Power-down sequencing with a “hard” power switch (stepper driver)

I'm designing a stepper motor controller and would like to have some advice on sequencing the shutdown process with a "hard" power switch. The Toshiba TB6560 driver that I'm using requires a specific ...
8
votes
3answers
2k views

What does n/o and n/c mean on a schematic diagram?

Okay so I have two questions. I am looking at a schematic diagram of a remote control for a toy car and I can't seem to figure out what the "n/o" and "n/c" components stand for that are attached to ...
0
votes
3answers
86 views

What could be the reason for chip capacitor failure due to silicone potting?

Is silicone potting of PCB board beneficial or risky? What could be the best material for encapsulating a power supply board? I used 2 part mixed silicone potting compound for encapsulating a ...
-2
votes
2answers
108 views

LED circuit Driver question

I’m trying to set up a circuit with one single LED (NICHIA NV4L144AR Specs: Forward current 700mA, forward voltage 11.9V, 8.3W max power) and a piece of LED strip 0.4 meters long (Specs:input 12VDC ...
0
votes
1answer
75 views

Can I use a DC-DC step-up module for a small form factor computer? [closed]

I want to design a DC power supply for my Intel NUC small form factor PC using a battery. The data-sheet for the PC: ...
0
votes
3answers
118 views

I have 3.1V LED 20mA and wire 20 or more [closed]

How you calculate how much Volt battery you need? Like: 20 x 3.1V = 62V ....or is it something else? I want to wire them in series manner.
1
vote
1answer
40 views

Use of blender's PSU

I would like to use blender PSU board. To power motor of the blender. Whole blender consists of this this board, control board (which blew up) and motor itself. I am now trying to hack this board to ...
0
votes
3answers
42 views

Connecting CMOS digital ICs that are powered from different power sources

Imagine I have 2 CMOS devices with logic gates, etc. Both use the same nominal voltage - 5v but are powered from different sources. If I will use simple regulators like 7805 on both sides, they will ...
0
votes
2answers
39 views

What's the use of the 4 outputs of a power entry module (Qualtek 864-10/009), and how to interpret it's circuit digram?

Main question: What is the purpose of having 4 outputs? If I only had pins 1 & 4, I would be able to use 115VAC when it's set to 115VAC, and 240 VAC when it's set to 240VAC. For 240VAC setting:...
0
votes
2answers
80 views

MOSFET Power Supply Explained

I am struggling to understand how the jumpers at the bottom of this diagram change the voltage of the circuit in this diagram. The input J1 is a 9V wall wart. By my understating the MOSFET only ...
2
votes
1answer
103 views

Why does my lamp only work when plugged the “right” way?

I have found a halogen lamp that only works when plugged to the wall socket the right way. I am baffled by this behaviour. The lamp is similar to this model, and uses a bulb similar to this model. ...
0
votes
3answers
93 views

Understanding this Mean Well Power Supply

I purchased, I believe, the wrong power supply for my purposes, but I'd like to understand a few aspects of its specs: https://www.meanwell.com/webapp/product/search.aspx?prod=ELG-200&mws=...
0
votes
2answers
122 views

Can I hook up more than one device per terminal on a power supply?

First post! My question is straightforward, and NOT a duplicate post. This is meat & potatoes here, less on theory, more on practical application. I know you are all more knowledgeable than I am. ...
1
vote
1answer
116 views

Advice for this P-Channel MOSFET Power Source Selector

I know there are already questions and answers about P-Channel MOSFETs and power source selection, but I still find myself pretty confused, as many of those are more complex than my circuit or simply ...