Questions tagged [electrical]

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1answer
151 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 ...
2
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2answers
57 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 ...
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1answer
452 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
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1answer
341 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 ...
12
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1answer
5k 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
1
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1answer
76 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 ...
4
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2answers
774 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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1answer
57 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?
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3answers
3k views

Capacitors in parallel with voltage sources

Why can't capacitors be connected in parallel with ideal voltage sources? In various questions involving it we were asked to ignore the capacitors, by our teachers without valid explanations.
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2answers
241 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
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1answer
87 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
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3answers
245 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. ...
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1answer
2k 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 ...
2
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2answers
385 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 ...
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4answers
821 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 ...
2
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1answer
335 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 ...
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2answers
958 views

What glue used here?

What glue is it? Is it safe for attaching?
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0answers
58 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
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1answer
91 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
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1answer
69 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
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1answer
69 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 ...
25
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3answers
5k 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?
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1answer
818 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 ...
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2answers
189 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)?)
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1answer
108 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 ...
4
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5answers
345 views

Grounding conductor meant to protect electrical devices?

I had a home inspection performed on an old house recently. The inspector noticed that some of the outlets had an unconnected third prong. He told me that the absence of a grounding conductor on the ...
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3answers
167 views

How to calculate the voltage used to light up the emergency light from the given details of manual..?

I have an emergency light device which is given by a small manual back side of it with some electrical specification. They are: Voltage: AC90-240V 50-60Hz Current: 0.1A Power: 18W Can I ...
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2answers
149 views

Can I harm my device doing these connections?

I was using a device (1) to intercept and read the SPI communication between a microcontroller and a LCD of another device (2). So, I did the conections as showed in the figure below. They use the ...
0
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2answers
179 views

Where to have PCB with microcontoller designed? [closed]

I’m involved in CNC milling/manufacturing/prototyping, a product we are designing needs an electrical interface that controls timing and dwell on 2 solenoids. This is something well outside of our ...
0
votes
1answer
420 views

How to calculate power used by my microphone?

I want to plug a microphone into my camcorder. The battery from the camcorder will provide the power to both the camcorder and microphone. The specifications for the battery are as follow: capacity = ...
0
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1answer
183 views

Question about ESD wristband and lightning

as far as I know all ESD wristband's ground connection has an 1M ohm resistor built in for safety. So what would happen if I am working on lab wearing ESD wristband which is connected to the home ...
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2answers
251 views

Measuring individual Voltage of the connected solar panel in series using I2C Protocol having GND in common as this get short circuited

I was stuck in a situation when i was measuring solar panels connected in series using I2C communication protocol. The common ground between the system makes the panel disconnected making a short loop....
2
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1answer
100 views

Do Electronic Engineers need to be “licensed”

Do Electronic/Electrical engineers need to be licensed? I have heard something along these lines but I do not recall where. And if so what is the license name? If I take a stab at my own question I am ...
0
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1answer
146 views

How to increase veroboard's current capacity?

I want to solder below circuit into a veroboard. As I notice my motor will draw high current. Can I paste copper tape to handle the high current? What others modifications should I do to make ...
0
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1answer
65 views

Finding Magnetic Flux

I'm hoping someone can verify an answer I have found for the following problem: A helmholtz coil consists of two identical circular wire loops placed coaxially. If each loop has radius a and carries ...
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2answers
2k views

Designing wig wag relay circuit

I have built the circuit below and am trying to get the lights to go into wig wag using the relay (wig-wag is often used in emergency response vehicles with red and blue lights flashing or orange ...
0
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1answer
112 views

Two isolated circuits (different ground) detecting contact with each other

EDITED: Two arduinos, each one powered by a battery. Each arduino is connected to a piece of metal. When pieces of metal from both arduinos touch each other, the arduinos have to realise the event. ...
-3
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1answer
275 views

Pull up FPGA & Pull down

Hi everyone I have a question that I don't quite understand. Explain what pull resistors do in the FPGA, and why we use pull-up resistors for our button inputs.
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0answers
105 views

Transparent Conductive Paint

Does anyone know of a transparent conductive paint? I am creating some home made electroluminescent panels and I need something what would work with water based polyurethane. Ive had some luck with ...
0
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1answer
59 views

How to implement 5V NPN component to a 3.3V MCU input pin

I just want to make sure about how to implement this to an MCU's input pin, if the MCU is limited to 8mA sinking/source current. And 3.3V input voltage.
1
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0answers
164 views

Aluminium foil not blocking IR signal

I am using an IR sensor (vishay tsop32 series) but I want to ensure that it only sender directly ahead so I made blinders out of pla and covered them in aluminium foil. However it seems that despite ...
7
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8answers
887 views

Bulbs on seperate circuits triggering third bulb

I would like to know if the following is possible, and if it is possible, roughly how the wiring should be done ... I have 2 light bulbs (BULB1 and BULB2) connected to SEPERATE switches. I want to ...
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1answer
238 views

How to start a cage induction motor when load torque is greater than starting torque? [closed]

How to start a cage induction motor when load torque is greater than starting torque ? Please help me with this problem.
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1answer
305 views

Why can't we use synchronous motors in fan? [closed]

What type of motor is used in wall mounted fan ? Can synchronous motor with damper winding be used in the same ? I know single phase induction motor is used in fan. But I am not able to figure out ...
0
votes
1answer
102 views

How to excite a fluorescent lamp without connecting it?

I'm a newbie in electrical engineering, so this might be a silly question. But are there any standard ways to create an electric field over a volume of air, strong enough to excite a compact ...
0
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1answer
359 views

Electrical charger design with power factor correcttion

Design an Isolated battery charger with PFC( power factor correction), which will take input from 230V 3-phase supply. Calculate the value of inductor, transformer and capacitors used. Also, select ...
0
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1answer
357 views

Digital compatibility of logic gates

I started an applied electronics course at my university and my teacher assigned us this assignment after a lecture on how to check the compatibility of two or more gates: Output electrical ...
1
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1answer
2k views

Converting a NEMA 6-50p plug to NEMA 10-30p

I received a compressor recently that has a (I think) 6-50p plug on it but my dryer is currently plugged into a 10-30r receptacle and that's the only 240v I have available. I'm renting the house so I ...
0
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1answer
77 views

looking for a device or tester to know if car is electrified [closed]

I'm new here and definitely not an electrical expert - so please forgive any lack of clarity and errors in my terminology or tags. We live in a rural area and drive a plug-in hybrid electric vehicle ...
1
vote
1answer
412 views

How can I calculate Ampere Per Hour if Intensity has been given

Today I had an exam on Technology, and there was a question: If a nano robot has a battery of 2.15Ah(Amper per hour) , how much it will last without recharching , if the robot spends 1.8I(Ampere) ...

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