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

learn more… | top users | synonyms

1
vote
1answer
25 views

what is the tempreture at which the thermal limit of an amplifier is reached

Introduction: I am upgrading a "power amplifier" that a fellow engineer has designed , my job is to add thermal protection against failure in prolonged use ( or if operator miss use). The ...
0
votes
1answer
56 views

To use Power banks and DC-DC step up Converter to make Electric Bicycle battery Pack

Summary of the whole project I have a small project in mind, just want to find out is this a possible way to make a useful power pack rather then use this normal way [![enter image description ...
-1
votes
0answers
35 views

Corona Discharge on power lines

I heard someone use an example of a power line that is at 300kv and the radius is 2cm. What is the electric field just outside of the wire? Obviously it is under 3000kv/m or it would go into corona ...
-4
votes
0answers
29 views

Add parallel battery bank to existing battery bank connected in series [on hold]

If 23 battery banks are connected in series, and I wanted to increase the capacity of the entire bank, could I add a battery bank in parallel? Does it need to be the same voltage as all of the other ...
0
votes
0answers
37 views

Looking for a SATA power connector, PCB mount [on hold]

I am looking for a SATA power connector only. Everything that I'm finding is the 7-pin SATA data connector and it is beginning to drive me crazy. I suspect that I must be asking the wrong question ...
0
votes
0answers
7 views

Can I connect and control 12 Arduino's over USB/serial to my laptop? [migrated]

I have 12 arduinos, each of them controlling some simple hardware peripherals. I want to interact with all of them over 1 USB connection to my laptop, where I have a python program communicating over ...
0
votes
2answers
88 views

Super capacitor vs. battery

I've made a turn signal system for my bicycle that uses power generated from the wheel. The wheel puts out 0-9v and is irregular depending on the speed. My lights take 3v, originally from two 1.5v ...
0
votes
0answers
33 views

Power Supply Conversion Pinout Confusion

I'm trying to convert a regular atx pinout to this pinout, but to wire it up I need to know all of the pin definitions for sure, so can yall help answer these questions? The target pinout is one for a ...
-1
votes
2answers
58 views

How much current do I need for a 5050 RGB strip? [on hold]

I want to use 5 meters 5050 RGB Waterproof 300 LED Strip + 20 Key Music IR Remote Controller Sensor. Is it okay if I use a 12V 6A Power Supply?
0
votes
4answers
60 views

Auto power off for 220 V AC cable breaks [on hold]

Can anyone suggest a circuit to automatically cut power when 2 core 220 V AC cable tied on poles powering 12 V SMPS at different locations breaks between any poles? There is lot of monkey menace. ...
0
votes
0answers
45 views

Can I bypass these two adapters?

Scenario I have a LiPo battery connected to a DC > AC inverter and these two adapters (images below) are plugged into the inverter. Hypothesis Everything runs ...
3
votes
3answers
122 views

Can I put +33 dBm through an 0402 capacitor/inductor?

Consider the following capacitor here on Mouser (C1005C0G1H330J050BA). If my understanding is correct, the only power dissipated is due to the ESR - ideally, reactive elements dissipate no power (or ...
0
votes
1answer
37 views

Passive Cell Balancing of an 2S3P Battery Pack

I'm currently attempting to design a passive cell balancer for a 2S3P battery pack (pictured below). Being new to power engineering I'm not sure where to start looking; I know I want to go with a "...
0
votes
3answers
63 views

Finding Total Watts Across Batteries?

When finding watts where you have the amps and volts you can find it by multiplying amps and volts. A x V = W If I have eight 6 volt batteries at 75amps each, ...
2
votes
1answer
105 views

How to calculate total power from spectrum?

I'm trying to measure total power(dBm) from the following spectrum, the spectrum is 5MHz wide, the peak power from the spectrum is about -40 dBm, I have an array of spectrum points(Power vs ...
1
vote
1answer
26 views

Can you use less then the rated current on a High Side Smart Switch such as BTS555

I often see Minimum Current listed on the data sheets of some Smart Switches, Power distribution Switches etc. For example in the data sheet of BTS555 it states that the minimum current is 128A so ...
0
votes
5answers
89 views

Plugging the same device on a jack of smaller tension will draw more or less current? [closed]

I'll put a set of ''right's''numbered based on my current assumptions, so if one of them is wrong, you can just point a couple out. Let's say I have a device that is labeled ''660W/220V'', so It ...
0
votes
2answers
668 views

I don't understand the text about LED's type and power consumption

On my web-surfing, I found some information about LED's type and power consumption. I don't understand below (Red-lines.) Why 'common cathode' power consumption is lower than 'common anode'? Please ...
0
votes
1answer
47 views

The right gauge wire for a 12v parallel wiring to LEDS and heat sink

enter image description here Hey guys would love your expertise on a project, I'm just a beginner on this stuff. I'm building an LED panel with a total wattage output of about 480W. My question ...
2
votes
1answer
50 views

Power categories in ASIC design (Design Compiler)

I am currently working on the synthesis, with Synopsys' Design Compiler, of an AES encryption module. In the power reports there are three power categories specified : Switching Power Internal ...
4
votes
1answer
236 views

Use ATX power source to power Raspberry Pi

I'm setting up several Raspberry Pi's and Arduinos connected together, and I'm looking for a way to power them. Would it be possible to adapt an ATX stock power source with female USB plugs using the ...
0
votes
2answers
127 views

I fried my multimeter while connecting it to AC

I just bought the multimeter "Multimeter Digital MAS830L" because I wanted to learn about electronics. INSTRUCTION MANUAL HERE. Well, I've read the manual and it said clearly : Alternative ...
4
votes
2answers
185 views

What type of controller is this?

In many simple microcontroller power controller applications, I see controllers that work in an "increment/decrement" on error with hysteresis implemented e.g. ...
0
votes
0answers
18 views

Typical values of G (condutance) and B (susceptance) of a real line

I'm modeling power flow of a grid and in order to solve some equations I calculated values of G (condutance) and B (susceptance) from R (resistance) and X (reactance) data of my lines. I used: G=R/(R^...
2
votes
2answers
423 views

Electronic components without rust or corrosion

Is there any sort of special conductive material that doesn't rust or cause corrosion?
0
votes
1answer
90 views

Bench Power Supply Project

I got a 750W (12VDC, 62.5A) power supply (I don't have it with me right now so I can't remember the model) from a old server and I was thinking on using it to create a lab bench power supply. My ...
0
votes
2answers
46 views

Can you use different Voltage and Amps to a charge phone? [duplicate]

If I buy a solar panel that outputs 18 Volts and between 250-300 mili-Amps will it charge my phone? I looked at the charger output for my phone and it is 5 Volts and 1 Amp. I know that Power (units ...
1
vote
2answers
82 views

Auto shutdown and start of Raspberry Pi (remote application) using powerboot 1000c - need help debugging the circuit

In my application, the raspberry pi (A+) is remotely located and is powered using Powerboost 1000c. The powerboost is connected to a battery (lipo) and a solar panel. The battery is rechargeable and ...
2
votes
7answers
348 views

The physical meaning of inductance

What is the the physical meaning of inductance? We know that the resistance "R" of a conductor is how easily the electrons flow through it...etc but what about the inductance "X" ?
0
votes
2answers
107 views

Simplest “battery low” indicator for a 3.7 volt lithium ion battery

I just need a single LED to light up when the voltage drops below a threshold like say 3.3 volt ( sharpness is not that important ). I know basic electronics like transistors,logic gates etc. On ...
0
votes
1answer
29 views

Powering a self-drive piezo buzzer with capacitors?

I have a project I am working on where I want to power a "self-drive" piezo buzzer for 20-30 seconds. However, in order to provide the power to this piezo, I would like to ideally use capacitors in ...
0
votes
0answers
26 views

Have QN9020 Output power to +4dBm? [closed]

The datasheet of BLE-SOC QN9020 says it can have maximum RF TX power as +4dBm by not using internal DC-DC Converter. How to ensure this maximum? It could be below that like 0dBm or something else?
0
votes
1answer
52 views

Measuring Active power through current sensors

i want to measure the AC current - with 220 V AC 50 HZ at home - i will use a current sensor then find the power factor through comparing the signals of the V and I then find the power then i ...
0
votes
1answer
45 views

What characteristics of a MOSFET should I be looking at? [duplicate]

I'm trying to determine a MOSFET for a circuit I'm building which will drive the gate of an N-channel MOSFET at 3.3v with an available current 40mA (**this will be driven using PWM at 4MHz), the ...
2
votes
1answer
96 views

Switching Voltage of Transistors

I am developing a system wich includes a laser-pointer and a digital LDR module. I'd like to switch the lasers with the GPIO pins on the raspberry. But, since I'm used to working with Arduino's and ...
0
votes
2answers
79 views

is one “bigger” psu more efficient than two small?

I'm going to replace my router and network switch, and question is if both devices comes for example with 5v 1a power supply, is it good idea to buy one 5v 2a power supply and connect both devices? I ...
1
vote
2answers
103 views

50A Accurate Current Sensing Circuit Design

I'm trying to design a current sensing circuit that can achieve a 0.01A accuracy across 50A DC. It is a battery powered brushless DC motor drive (battery --> current sensor --> controller --> motor). ...
5
votes
3answers
252 views

Using supercapacitor as backup for MCU

I have this project that requires some kind of backup power supply. and I am planning to use a 5V 4F super cap. there are my questions: I am planning to charge the cap with a diode and 100 ohm ...
0
votes
2answers
65 views

Single phase 2 wire motor… Can this be connected to household electrical wiring?

Hi I have a soft ice cream machine which shows as240v but is a single phase motor. It has a scotch block with two black wires and the earth separate. Can this be attached to normal uk sockets via a ...
3
votes
4answers
249 views

Why is stepping up voltage during transmission considers I^2*R but not V^2/R?

During the transmission, the generated electric power is delivered after stepping up to hundreds of thousands or even more voltages by transformers. In that case since P = I*V, increasing V reduces I ...
1
vote
2answers
89 views

A basic question on Current Flow, Voltage, and Power consumption

Background: Assume that I have Bulb that consumes 10 watts of electrical energy (power). The operating values for full brightness are: 5 volts, and 2 amps. Since Power(p) = Voltage(V) x Current(I) = ...
1
vote
3answers
83 views

Current Sensor Resolution

I have an application where the maximum DC current is 160A. However in reality the actual current flow never exceeds 40A. I want to measure the current with an ADC (like one found on the Arduino or a ...
1
vote
1answer
105 views

Calculating the power supplied by the current and voltage sources

simulate this circuit – Schematic created using CircuitLab I have attended one exam where I was asked to solve this Question. Generally the Power is nothing but the product of current and ...
0
votes
1answer
42 views

Weird op-amp voltage increase when using AC-DC power supply

I'm trying to create a PWM signal to dim an LED. I came a across this circuit: When I tried it out on a breadboard powered by a 5v supply coming from my USB Digilent Analog Discovery, it worked great....
0
votes
1answer
67 views

A question about reactive power through a capacitor in LTspice

Before posing the question I would like to write the assumption I make for the power concept in passive circuits. As far as I know the power dissipated in an RLC circuit is the active power which is ...
-1
votes
4answers
193 views

How to convert 700V AC to 5V DC 500mA?

I have a device that requires approximately 500 mA at 5 VDC, and I am required to get this power from two legs of a three phase power supply. The voltage between these legs can be between 110 and 700 ...
0
votes
0answers
29 views

Total electrical rating

I have a commercial gas fired heater with a Total electrical rating of 848 W. Is this the same as the Maximum continuous rating? Or what would the typical power consumption be when the unit is ...
-2
votes
1answer
55 views

Actual voltage concept [duplicate]

I just want to know what voltage actually is. I seem to have misunderstandings about this; is it energy of electrons? I just want to know what actually is voltage? And secondly I'm confused about ...
3
votes
2answers
81 views

How to power a button's LED within a guitar?

I'm working on a guitar, and the plan is to use three latching push buttons so that each pickup can be turned on and off individually. I'm fairly confident that the following diagram should work for ...