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Questions tagged [power]

Where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.

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1answer
47 views

How much power do power stations in parallel supply?

In modern power systems, the power is supplied by effectively connecting multiple generators in parallel. However, not all these generators are equal, some stations supply more power than others (I ...
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0answers
15 views

2 MOSFET DC to AC Inverter Design (Wireless Charging)

For one of my projects, I am trying to create a wireless charging station for a LiPo battery. For my input, I'm taking the standard 120 Vrms, 60 Hz voltage source I get from a outlet. From initial ...
0
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1answer
24 views

Low power design, choosing correct buck-boost converter for LiPo battery

I want your opinion on subject considering low power applications. I want to build basic loraWan tracker with Murata Lora module(3V3), and I want to use LiPo battery. What Im struggling with is power ...
-1
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1answer
45 views

How to check if a power supply is safe?

I have received this 29V 2A Transformer Power Supply. It smelt a lot so I dismantled it. But I don't know a lot in electronics. So my simple question: how to check if a DC power supply is safe?
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0answers
42 views

Electrical engineering on motor [on hold]

Please help me in finding the solution of it and i am very various for it.
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0answers
16 views

Integrated circuit for phase power measurement of PWM driven motor

I'm trying to find an integrated circuit to measure power on at least one phase of a PWM driven syncronous or asyncronous motor. I've found plenty of chips that do this kind of job for 50-60Hz ...
0
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1answer
52 views

One wire AC power

I would to connect a nodemcu board (powered by 3.3 V) to AC power behind the light switch, but I can use just one AC wire (the one that opens/closes the switch for light). Is it possible to do that ...
0
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0answers
17 views

DATAQ Data acquisition device power connector

I got hold of a DATAQ DI-710 data acquisition device. The device was delivered with an AC-adapter. According to the data sheet, the device can be connected to any 9-36VDC however. The only problem is ...
0
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0answers
43 views

Using circuit breaker instead of a fuse

I am making a contraption that uses an atmega328 to trigger a water pump to water the garden plants on a schedule. The controller will run on low power mode to sleep all day and wake up to water the ...
6
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2answers
973 views

Power Transformer: 110V and 220V input, with two 15V outputs 180 degrees out of phase

I have never designed a power supply before and have a few questions and would appreciate any help. Firstly, I want to use a transformer that can both take 220V and 110V inputs. Can I use a center ...
0
votes
1answer
64 views

Is this cheap extension cord safely rated for 1625W?

Comparing two cables that I have, a cheap extension cord and an expensive "heavy duty" extension cord, both are rated for the same load. Is this an inflated rating or is it accurate for the white ...
0
votes
1answer
27 views

LC filter applicability for power to output cables

I am designing a circuit that has a 240MHz MCU and some cables going to sensors so I am wanting to reduce the clock noise getting onto the supply line and going out the cables by using an LC filter. ...
0
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1answer
35 views

Tablet battery dead, 5v directly to pcb? [on hold]

I have a tablet with Dead battery. Since I cannot buy new battery in near future, it cross my mind to connect battery bank directly to pcb (solder output from battery bank to battery connectors on PCB)...
1
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3answers
69 views

Resetting CD4017 Counter when power source is OFF

I found the circuit below online and I have two questions about the reset switch. Does it help to click the reset button when power is OFF? I mean, does it clears the memory of the CD4017 chip when ...
0
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3answers
100 views

What is this component on circuit schematics? [duplicate]

It's a resistor like coloured 2 pin component from a power supply board of a home theatre, with a glass-transparent aspect. I'm a hobbyist and not into complex circuit till now... looking for an ...
3
votes
1answer
66 views

How can i add voltage regulator to unregulated DC adaptor?

I would like to add L7809 voltage regulator to an unregulated DC adaptor,as it is shown in the photo. In the data sheet,there is a figure for application circuit that included 2 capacitors(bottom ...
0
votes
1answer
51 views

How to calculate maximum amount of bulbs I can connect in parallel to match design specification of 1.5 A?

I'm designing a sensor triggered circuit that involves 220 V passing on a PCB, so I designed the board thickness to withstand a maximum of 1.5 A. The main load on the circuit would be a series of LED ...
1
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0answers
45 views

why are loads specified by power than by impedance? [on hold]

I see that during power system analysis (load flow) the model of a load is as a PQ bus, where active and reactive power is specified. But in reality, aren't the loads also components like bulb or ...
0
votes
1answer
27 views

What is the reference for High side IC with internal mosfet driver

In the schematic below (like many other) the IC (switcher) is on the high side. I was really curious how the internal circuitry of such an IC is referenced to. My first thought was that everything ...
-1
votes
1answer
44 views

Tumble dryer heater element [closed]

The heater element on my tumble dryer died, ordered a new one using my model number etc. The problem I have is that the original element is rated 240 V and 1050 W, the replacement sent is 240 V and ...
4
votes
2answers
79 views

Flyback Converter Capacitor Value selection with given ripple voltage limit

I need to design a flyback converter for my project. In my design the output voltage is 15 V. I calculated all the parameters including inductance values, diodes selection etc. However there is a ...
0
votes
1answer
51 views

LDO Voltage regulator output unexpected Voltage drop

I have a circuit using LD39015 1.2V Low Drop-out voltage regulator. . The value of VCC is 3.3 Volts. The goal is to supply an ADC channel with a constant stable voltage so I can use that to ...
3
votes
1answer
69 views

5v power switcher: Uninterruptable power source

I know there are a few other questions similar to mine, but after looking through the answers, it does not seem like it's what I need. I've also looked at the Arduino Due/Uno circuitry, and they aren'...
0
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0answers
14 views

Control Fona 808 GSM/GPS running solely from battery power

I would like to power my Fona 808 GSM/GPS modem (& associated Arduino) from batteries rather than USB. The Fona has a LIPO battery connected, which provides power to the board to cover the peaks ...
0
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0answers
32 views

Current and power ratings of components for pulsing current

I want to put together a circuit that will pulse 40 A of current through at inductive load pushed through by 80 V. Cost is a factor for the design and build, and I would like to know what I could ...
1
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0answers
16 views

Hook up an automatic transfer switch with two phases only

We have a house in Haiti connected to the shore line. The shore line isn't always working so we bought a generator. I wanted to ground one of the two phases to create one neutral, one phase and a ...
0
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0answers
20 views

Output current handling for TC1044S

I'm reading the TC1044S charge pump datasheet to create a negative dc power from a +5v supply. But I can't understand how much current this part can deliver. Can I power multiple opamps with a single ...
2
votes
1answer
64 views

Power Dissipation of Op-Amp

If we look at the output stage of the MP111 op-amp it's just 2 MOSFETs in series. I'm curious why the power dissipation of the device isn't simply \$R_{\text{ds(on)}} \times I_{\text{out}}\$, but ...
1
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2answers
223 views

Rough estimation of power consumption in an electronic design [on hold]

I want to get a rough estimation of the power that my design is going to need. Is it sane to calculate the power of every IC component based on values in DC Characteristics in the corresponding ...
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votes
1answer
51 views

Inductor power choke

I'm looking for this inductor 10 µH. Need help to recognize series model of this IC's inductor.
1
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1answer
35 views

LED strip power requirement [closed]

I have an approximately 1 meter LED strip in "warm white" running from a 2 amp power supply for some time now with no problems. I want to add another strip, of about 2 meters, to this same power ...
0
votes
1answer
35 views

I have a H07RN-F 3G cable which is rated at 400V/16A, can it be used for a normal 220V schuko connection without consequences?

Basically making it a 2.5mm gauge cable, will it have any negative effects on appliances that run on 220V - I am not sure if a 400V/16A rating is the max or the supposed to be used at/for rating?
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0answers
23 views

Generator RPM and Energy Relation

If a 3 phase AC generator rated 5 kW @300 RPM generates 5 kWh in one hour of continuous operation, is it possible to find how many rotations of the generator at 300 RPM will generate 10 Wh? Thanks in ...
0
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1answer
60 views

RCD tripped when measuring with a scope

Below was my setup: The moment I connected the probe the RCD tripped. My scope was earth grounded. Does that mean I shorted the neutral and the earth ground? I know that neutral and earth are ...
0
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1answer
33 views

Calculating true output of LED

I'm trying to figure out the true output of the individual LEDs on this panel: https://www.amazon.co.uk/gp/product/B01M10RZ98/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 It's a 96 LED infrared ...
1
vote
1answer
29 views

Forward Converter - Voltage through primary winding Question

So my waveform is a step function, where maximum voltage is at Vin = 40V, and minimum voltage is (-N1/N3)*Vin = -200V. The minimum voltage doesn't sound right to me, so I was wondering if anyone can ...
-1
votes
3answers
76 views

Oven power usage estimation [on hold]

Does an oven draw less power when used at a lower setting? I'm trying to calculate the cost of running my oven on the lowest setting as a dehydrator. Wattage is 4800 kWh/cycle is .92 and my cost for ...
0
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0answers
26 views

How to specify an “external enable” (buffer) chip for a current-hungry peripheral

I have a design with a simple quadrature optical encoder as one of my system peripherals. I'm working on reducing my power consumption in the "idle" or "off" state and the optical encoder draws 18mA ...
0
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0answers
21 views

Power source select with push buttons

For my project I have 2 power sources and 2 push buttons. What I try to achieve is if I push on button #1, power source 1 connects to the circuit. If I push on button #1 again OR on button #2, power ...
2
votes
1answer
81 views

5-10 second backup for wifi router during power cut

In India power cut is often. And most houses are installed with Inver-battery, for backup till the power comes back. But since all inverters don't behave as ups, there occour a little gap between the ...
0
votes
1answer
61 views

Good PCB Design - Single Power Plane with 2 Power supplies (+ve & -ve)

Recently I've taken over a project which requires low noise but the design given to myself does not meet the requirements. I noticed on the PCB design It has a single Power Plane with 2 separate ...
0
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0answers
33 views

Equal Voltage, Higher Wattage

I am attempting to make a solar powered fan for my room. I am going to be using a 9V DC motor to spin the fan axis, and I have my choice between different 9V solar panels. My question is this: If I ...
1
vote
1answer
35 views

Does Reactive Power flow between Energy storage elements in a three phase system?

I noticed that unlike the single phase ac power sources, the power in three phase is constant which means the instantaneous power is the same as the real power which is $$3V_{rms}I_{rms}\cos{\theta}$$ ...
0
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0answers
31 views

Drone Ground Control Station Switchable Power Supply

My drone ground control station will be able to run off of a 12v power supply, or a 12v car battery. I want to make it so that if the power supply is plugged in and providing power to the load while ...
0
votes
2answers
79 views

Resistor selection based on power rating

For example, I have a cicuit of single resistor R = 2k, apply with Vdc = 18V. The Power of the resistor is about 162mW. Should I pick a resistor with higher Power rating (Eg 0.25W 0.5W) or lower ...
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0answers
33 views

How would you design a circuit to cut off power when the draw goes below a certain threshold?

I have a bunch of devices that power on and off frequently and I have found that when off, the "vampire" draw or standby power is rather large. I am aware of remotes and such to cut the power, but I'm ...
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1answer
33 views

Interfacing coin cell back up for internal RTC of ESP32

In esp wroom-32 all the VDD pins has a common connection. It includes VDD_RTC too. So in case of power failure if I switch the power between main DC source and coin cell using a mosfet, will it create ...
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1answer
29 views

Max power draw on voltage rails of mini PCIe Card

I am designing a custom mini PCIe card. What is the max power I can draw from the 1v5 rail, and the 3v3 rail?
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0answers
37 views

please help eTap has has been shut down ervery time I try to open existing eTap project [closed]

I am new to eTap and every time I try to open existing eTap project show a dialogue with the following message "etap has encountered an unhandled exception of type 12 etap will create mini dump file ...
0
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1answer
140 views

Finding a CPU's Capacitive Load - Computer Architecture

I'm new to computer architecture, and found a question similar to that on this site already with actually quoting the same text book. I'm struggling to figure out if the answer is 1.77Ghz or 3.55Ghz. ...