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Questions tagged [electrical]

The tag has no usage guidance.

1
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1answer
22 views

How to know if a motorcycle battery and power generator is enough to keep an device turned on without discharging the battery?

I have an arduino project in mind but I have some questions before I can start to make it. I need to plug an arduino Uno on my motorcycle, but I dont know if it will consume too much energy and lower ...
1
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1answer
61 views

Power Switching using MOSFET and opamp

I'm trying to understand the Arduino design. LM358 and FDN306P is connected in between USB input and primary source input. In presence of USB and primary supply the Arduino mega board is drawing ...
-2
votes
1answer
66 views

DC signal output 0-5V with constant 10mA

I am designing a Digital Logic Board and need to add a DC signal output from 0 to 5V (with potentiometer) with a constant 10mA. I have checked designs with LM317 and LM334 for adjustable current upto ...
1
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2answers
94 views

Laptop fried from spark while connected via USB to a battery system

EDIT 10/11 9:40am Central: I learned from my partner on this project I got the order of events wrong. I have edited the post accordingly. I am working on some custom electrical hardware for ...
1
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0answers
27 views

How do I find the real power losses from using power world simulator? [closed]

I'm trying to simulate the power flow through the circuit. I need to find the total real power losses. How do I do so? I have tried using newton rhapson method to simulate the power flow. My question ...
0
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0answers
9 views

Electrical wirinig brown and black only [migrated]

I want to change the classical electrical switches in my newly purchased house to smart switches and i am very confused in regard with the electrical wiring carried out by the home developer. The ...
2
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1answer
69 views

What are different battery capacity algorithms used? [closed]

I need to implement an algorithm to know the capacity of a battery. I don't want to use any external gauges which are available on the market. Can you suggest which algorithm(s) is/are popular? Can ...
0
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0answers
80 views

Please help identify this vintage component

I got this item in a bidding lot and have been trying to figure out what it is ever since. The nearest I can tell it is either an electro shock therapy device or perhaps a remote detonator. It has ...
0
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0answers
48 views

Residential wiring mapping [migrated]

I wanted help to verify the results of me mapping our house wiring in order to replace it with circuit breakers Here's the fuse box: The main lines also go through, will try to get in the attic to ...
0
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1answer
18 views

How to get the Forward voltage of a tachometer?

I am currently in the process of building a circuit board for components that I am going to use on a lathe. I want to use this tachometer. https://www.amazon.com/dp/B00VKAT8A2/ref=...
1
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1answer
59 views

what is exactly 'gain and loss' is and how is it used?

I'm kinda confused by its definition. I know that gain is a measurement and gain and loss is the calculation (??). I'm still in 12th grade. Please guide me.
2
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0answers
101 views

Identify this circuit symbol with two overlapping circles [duplicate]

I came across some images of schematics and have never seen this component before - what is it?
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0answers
47 views

Power calculation for given load

Peak Load Normal/Actual load Currently available 300kW 180kW 200 Amperes The system is currently running on 200A connection ...
0
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1answer
12 views

Need to find a compatible ac adapter

I have a Syemour Duncan guitar effects pedal that I bought several years back. I seem to have lost the power adapter for it and they don't make them anymore. I looked at the power input on the pedal ...
1
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0answers
68 views

What is the definition of hull voltage?

I'm studying the subject Electrical Safety in Engineering and a special term really drew my attention. When I tried to google it, no any option was suggested but hull protection. In the presentation ...
3
votes
1answer
69 views

Create my own battery for my electric bike [closed]

I was wondering if it's possible to avoid buying a $400 48V 15Ah battery with an output of 54.6V and 2A, and instead make one by joining multiple 3.7V 5Ah batteries in series and or in parallel? Is a ...
0
votes
1answer
45 views

How could the Gate-Source potential difference be neglected?

I’ve been reading the book Electronic Principles by Malvino In the Voltage-Divider bias section of JFET, if gate current is negligible then how did Gate Voltage attain a negative value, given Vdd ...
0
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0answers
30 views

Dependent Sources in thevenin

is it allowed to have only one dependent source in a circuit ? (and not a single independent source) also i want to know why circuits with no independent sources ( and with any number of dependent ...
2
votes
2answers
45 views

Connector type suggestions required for 12V supply

I made a power supply enclosure with a mains switch and now I need external DC connectors to be mounted in the slot shown. I want to mount two female connectors onto a 3D printed panel, that will sit ...
5
votes
1answer
172 views

I purchased a few of these units and have no idea what they are. Is there anyone that might have some suggestions?

The item measures 1" wide and 1-1/4" high nad about 1/2" front to back
0
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1answer
86 views

How much capacitance/joule/watt is needed on average household' energy storage system with supercapacitor?

I am on the process of making assumption how much capacitance/joule/watt is required on average supercapacitor as household' energy storage system. I plan the design for energy hub to be charged by ...
3
votes
1answer
88 views

Giant pogo pin or spring probe pin for registration during electrical test

Solved: if you search for "GP-2 PCB Board Umbrella Shape 5.3mm Tip Testing Probe Pins Receptacles" you will find these probes! Thanks for the help! I am designing an electrical test fixture, and I ...
11
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1answer
986 views

Symbols: Double-arrow circle enclosed “10” on electronic appliances

What does the symbol that says 10 inside the double arrowed circle mean? I have seen a similar symbol on another appliance that had the number 25
0
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2answers
76 views

OpAmp Comparator Circuit Design for High/Low voltage measurement

I am new to this. I want to make a circuit to measure the voltage from (0 ~12 V), which can have 2 op-amps as comparator to give the output positive, when the voltage goes from 8 V to 12 V and give ...
1
vote
1answer
50 views

UPS for 1.1kW system [closed]

We have 3 motors each 0.37kW, they are now running on mains power, sometimes mains power cutoffs/fails, in that case we want the motors keep running. The motors are controlled by a PLC which do not ...
3
votes
2answers
459 views

Capacitor and inductor working principle

I want to know that there is opposition mechanism of current in inductor say back emf than what is opposition mechanism of voltage in capacitor ??? And also want to know that when inductor suddenly ...
0
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0answers
24 views

Giving a ground connection to an diy equipment

I have recently built an led pannel, the leds are mounted on an alluminium frame. Now when i connect the pannel to the mains the leds glow but the alluminium surface feels a bit rough which feels ...
0
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0answers
62 views

How does the wind farm decides to give priority to reactive current during faults or voltage dips? [duplicate]

The grid code for lvrt system says that during low voltage faults wind farm must give priority to reactive current and supply it to grid and decrease the active current. How does it provide reactive ...
-1
votes
2answers
65 views

logic circuit with 0 output by default [closed]

i am designing a logic circuit. in my circuit i need a module witch has 2 inputs("key" & "in") and 1 output("out"). i want when inputs are open, this module drives '0' to output by default. and ...
0
votes
1answer
49 views

Can the TFT in LCD displays be made in the nanometer range?

Can the TFT elements and hence the pixels in an LCD display be made in the nanometer range? Say 10nm x 10nm?
0
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1answer
97 views

Capacitors in parallel with Voltage Source

Why can't capacitors be connected in parallel with ideal voltage source. In various questions involving it we were asked to ignore the capacitors, by our teachers without valid explanations.
1
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2answers
38 views

Network Theorems on DC and AC

Are network theorems (KVL, KCL, Thevenin, Norton, Superposition, Max Power Transfer) applicable on both DC and AC networks
-1
votes
1answer
43 views

Toggle between two leds [closed]

I am designing a circuit with not a lot of knowledge in electronics and I am close to finishing it. The finishing part remains. So, I have got a logic 1 or 0 from comp op amp and based upon that one ...
0
votes
0answers
27 views

calculating AC amperage requirement for DC load

I'm trying to learn how to calculate the AC amperage requirement for a given DC load. Is there an online calculator that provides this? Example - 62.5a, 48vDC load. At 208vAC, how many amps would be ...
0
votes
3answers
74 views

How to supply electrical current to a motor-powered rotating shaft?

I want to supply electrical current to a motor-powered rotating shaft. The current supplied is of the order of 400-600 amperes (AC or DC). In what ways can it be done? Shaft speed is around 1400 RPM. ...
-1
votes
1answer
133 views

Why does a wind turbine deliver reactive power to the grid during no winds or when turbine is stopped?

An answer to a previous question explained that a turbine in stop mode may deliver reactive power to the grid. It also takes active power from the grid to run its control system, lighting system and ...
1
vote
2answers
353 views

How do designers know about kilowatt power of wind turbine generators like 1.5 MW?

Generators and transformers are always designed in kVA because designers never know about the load it will provide power to. Then how do we know the wind turbine generator will deliver 1500 kW or 2 MW ...
0
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4answers
167 views

Overheating of LM1117 SOT223, 5v-3.3v

I'm having problems with my design. I put the schematic here, maybe someone can find an error that I didn't find yet. EDITED[I forgot the schematic, sorry...] The microcontroller, dsPIC, has the ...
0
votes
1answer
61 views

Why does a turbine with PMSG and full converter system draws reactive power when turbine is stopped or there is no wind?

Our turbine has a permanent magnet synchronous generator and full converter system (rectifier diods for rectification and IGBTs for chopping dc link voltage and as inverters) which means its generator ...
0
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0answers
25 views

Power Outages and Surges

I live in South Africa where we experience frequent power outages due to so-called "loadshedding". With this, there have been numerous cases of damage to appliances due to surges, usually when power ...
0
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2answers
83 views

What glue used here?

What glue is it? Is it safe for attaching?
0
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0answers
45 views

Behavior of a pin that, initially is configured as output, but, inevitably is configured as input when it should not be

Helo, all !! I have a doubt, I'm using a MC9S12DP512 microcontroller to read another microcontroller, that I will name it as A. But I'm having some problems. Here, I will present you a image of a log ...
0
votes
1answer
43 views

Difference B/w LTxxx Ics and Lmvxx Ics

I have been strolling towards being a circuit designer, using eagle and ltspice and i am trying to learn about new ic's and stuff. recently the thought about how does an LTXXX module and LVXXX(or LMXX)...
0
votes
1answer
59 views

kVA calculations

For electrical panels / systems with three phase electricity (red, yellow, blue) ~220/127. When using line to line we get 220 V is this considered single phase system or three phase? I know three ...
0
votes
1answer
58 views

Ideal Energy/Battery Source for a Battery Powered Lamppost

​Hello everyone, Relatively new to electrical engineering (my background is more in coding), so, thank you ahead of time for all your help! Project: I was tasked with creating an outdoor lamppost ...
22
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3answers
2k views

Why solder mask are not applied to RF PCBs

I've gone through some of the RF PCB designs. In which solder masking on the traces are not present. Like this one Is there a specific reason or performance issue to remove that?
0
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0answers
12 views

Deriving a Voltage Dependent Expression for Surge Arrester Characteristics

I'm performing a transient voltage study, and I'd like to be able to see the resulting waveform with the addition of a surge arrester installed. Given manufacturer data (V-I characteristic curve), is ...
0
votes
1answer
157 views

USB Bus Powered with LDO device example

I'm planning to use the FT232R in my USB device. The device consists of the FT232R and a dsPIC33EP64MC202 (Basically speaking, the FT232 and a microcontroller only). On the FT232R's datasheet, at the ...
1
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2answers
164 views

why does current like circulating?

why does the current in R2 remain always zero regardless the value of other parameters(V1,V2,R1,R3)?)
0
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1answer
103 views

High temperature of components to joining & soldering

Please help me to know the best components for the process of welding an electronic circuit to operate it in a very high temperature environment up to more than 600 degrees Celsius? Note: I do not ...