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Questions tagged [electrical]

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1answer
415 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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1answer
107 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 ...
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3answers
105 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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1answer
109 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 ...
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1answer
106 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. ...
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1answer
52 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.
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1answer
82 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 ...
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1answer
275 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 ...
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1answer
105 views

how can I generate Output 2 to give a fixed delay pulse on a rising and falling edge of Input? [closed]

how can I generate Output 2 to give a fixed delay pulse (about half a second or less) on a rising AND falling edge of Input? ...
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1answer
217 views

Is this dimmer compatible a DC 12v power supply? [duplicate]

This power supply is used for LED strip lights I recently purchased. I want to know if the dimmer below can be used with the power supply. The PS is AC 100-240v (IN) to DC 12v (OUT), while the dimmer ...
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1answer
103 views

Can Inductor force abrupt current change through another inductor?

Say the 3H branch of the circuit was connected to the 1V source for a long time such that 500mA current is flowing through the 3H inductor. Then after long time the switch was connected to 1H ...
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1answer
518 views

What kind of motor is used in electric room heater?

I did enough surfing to know about the kind of motors used in electric room heater, but not able to finalize. The principle seems like working of an induction motor with a electromagnetic stator but ...
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1answer
2k views

BLDC Calculation for Back EMF

I have a brushless DC Motor that i am considering buying from hobbyking.com with 2100Kv (RPM/v) i am trying to follow the equation on Wikipedia's motor constants page i have included the equation here ...
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1answer
47 views

Mixer Audio output xlr small contact with pin power suply of guitar pedals , possible damages?

Last night after a gig my audio Mixer output cables has had a small contact with the pin of the power supply of my guitar pedals that was on electricity. The mixer was not on electricity but the VU ...
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2answers
166 views

Can a capacitor prevent over-amperage of lithium ion batteries?

I have an electric motorcycle I've built, I have 7 Nissan Leaf battery packs in series to make 48v nominal. Unfortunately, after a month of enjoying the acceleration a bit too much, the batteries no ...
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2answers
140 views

What is Waveform of current in rl series AC circuit when operated for first time i.e. from time t =0?

(https://i.stack.imgur.com/fpWP4.jpg) What is Waveform of current in rl series AC circuit when operated for first time i.e. from time t =0? Is it 0 from 0 to 90 degree
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1answer
432 views

How to wire this transformer? I am not clear on what these wire colors mean and where they go

I read several color coding guides but I am not sure which wire goes where... My guess is that the black is the L wire, which stands for Live, and the white wire is the N, which stands for Neutral, ...
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2answers
65 views

DC distribution

My question is this that I am confused about the fact that we are feeding 220 V voltage from both ends of a distributor and then we are restricting that the maximum voltage should not exceed 6V what ...
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1answer
1k views

Can we use 125VAC 20A switch in place of 12VDC 20A switch?

Can we use 125VAC 20A switch in place of 12VDC 20A switch? I have searched my local market and found 125VAC 20A switch. Can i use this AC switch in place of 12V 20A switch as it is not available in ...
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1answer
57 views

What are the Disadvantages of unnecessary increase in PID gains?

I read somewhere that if we increase the PID gains unnecessarily, it will cause more energy consumption of the controller and it will lead to noise and distortion in the practical. May someone please ...
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2answers
2k views

How to distinguish between Thermistor, Varistor and disk capacitor?

How to distinguish between Thermistor, Varistor and disk capacitor they usually look the same. Is there any way to distinguish between the three? What are some ways I could do that?
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2answers
628 views

Understanding surface and volume polarization charges

Can someone please give me an intuition of this formulae? I am unable to visualize the formulae in equation 5.26. Specific question - How does a dielectric when kept in an external electric field ...
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1answer
485 views

effective diameter vs overall diameter of multi-strand wire?

Is effective diameter the outer overall diameter of a 7-strand earth wire, (about 2.1 mm), or the copper-only diameter based on 7 x 1 mm strands. (2.645751 mm) ? (Refer to answer on multi-strand wire ...
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0answers
16 views

Battery Charge and Discharge Time Calculations

I am performing some calculations but struck with confusion whether I am doing it correct or wrong due to contradictions of these calculations on different calculators websites. I hope here someone ...
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1answer
57 views

First design with EEPROM

I want to get an idea of how to use a chip, code it and burn it. So an and gate could be a good choice. I've thought about using AT27C01024-70PU or AT89LP4052-20PU. Got this burner in mind: https://...
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1answer
57 views

Oscillator connection

I have two questions here for how to connect the oscillator to a microcontroller (SPC584b): How can I determine the values of the capacitors? What is the need of SB2 & SB3?
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0answers
27 views

Superposition analysis with VCCS

I have just started doing electrical engineering course in the university. And I really don't understand how to treat those dependent sources when doing the superposition analysis of the circuit. Here ...
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0answers
55 views

Thyristors problem in a 1800v capacitor discharge system

I have two thyristors “R1275nc21x, they are Westcode thyristor and have some issues in my application. I want to make a capacitor draining system with 1800V charged and it can discharge to the coil (...
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2answers
47 views

Does ideal Transformer transfer DC input voltage to secondary side, under NO-Load and Loaded condition?

Does ideal Transformer transfer DC input voltage to the secondary side, under NO-Load and Loaded condition? please you take DC input for a long time. Also consider two more conditions, 1st: for ...
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0answers
24 views

Assistance with getting VM3558T motor running

Good afternoon, I've spent quite a while trying to figure out this problem but this field is not my expertise. I'm trying to build an ABS plastic shredding machine for recycling - I've got ...
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2answers
41 views

Total Dissipated Power

Please help look into to the below question where total dissipated power is to be calculated. In the solution given in the text they have added the under root of the power and then squared the result. ...
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0answers
31 views

Difference between magnetizing inductance and primary inductance

What is difference between magnetising inductance(Lm) and primary inductance(Lp) of transformer?
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1answer
27 views

AC Load Detection with auxiliary power supply

Is it possible to detect a load in an a.c. circuit before switching the main power supply supply on? Perhaps by using an auxiliary circuit which has it's own power supply, like a multimeter?
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1answer
82 views

How to build a programmable LED strip? [closed]

I'm trying to build a home-made LED strip (non-RGB). It will be using single color SMD chips in array. The thought I have right now is to have 3 rows, each with about 15 or 25 same single color LEDs, ...
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1answer
49 views

Help finding voltage between two points

So, how should I proceed to find U_ab (or V_ab)? I have found I = -0.5mA, U_1=-2.5V, U_2 = -0.5V, U_3 = 2.0V. How would I even find U_a and U_b separately so I can apply U_ab = U_a - U_b? Also, ...
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2answers
103 views

PCB trace width

I am trying to design a PCB circuit in altium designer. My circuit consists of one ATmega8a, one NRF24l01 and three magnetic relays (mini relay 12V MPR-S-112-A.) I want to set the trace width to 0....
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0answers
31 views

How to develop Differential Conductance dI/dV measurement setup?

I have a Lock-in as sinusoidal Voltage source, DC Current source and Multimeter. Can you please help me to develop a functional setup for dI/dV measurements. How can I design the circuit? What ...
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0answers
39 views

Ballast Power Draw

I am trying to calculate the current draw for 6 florescent bulbs and ballasts. There is one ballast per 36W bulb. I know that the current draw for each bulb would be 36/240 =0.15A (0.6A total) How ...
0
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1answer
58 views

AC noise to electronic circuitry

I find some random issues that is still unknown. I'm using mean well SMPS 12v, 3A for supply and charging 2 cell battery 7.4v with a charging current 1.2A. The supplies are parallel which is switched ...
0
votes
1answer
82 views

Find rotor stator loss in a 3 phase delta connected induction motor?

I'm trying to work out stator input power of a 3 phase delta connected induction motor. I have the equation Stator Input Power (P1), where P1= Pm + rotor copper loss + rotor stator loss. I have Pm ...
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0answers
19 views

How does electrical noise affects signal and distribution power?

What is electrical noise and mechanical noise How does it interfere with power? - signal power - Power distribution/ transmission
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0answers
58 views

Help with determining the open circuit voltage

Can someone go through why Vxy= -84mV? Given the values off VB=180mv R1=22ohms R2=68ohms R3=150 ohms. Many thanks
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0answers
114 views

Relation between torque angle and power factor

What is the relationship between torque angle and power factor for a induction motor? Here is my understanding. Lets say a stator coil produces a magnetic field and the field induces voltage in a ...
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2answers
53 views

How VFD affects an isolated IOT system

To avoid noise from the external system I tried to isolate the internal completely. So I added DC-DC isolated converter with signal isolation. I have attached the picture. Still when reading data and ...
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2answers
193 views

Best way to power 120 VAC fog machine with DC?

OLD: I have a 120 VAC 400 W fog machine. I want to mount this on a robot that can supply 12 volts. Can I just reuse a $10 car inverter from Amazon or is there a better way to do this? UPDATE: So I ...
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0answers
42 views

Robotic tool changer functionality

Have you any idea how is a changeable end-of-arm tool powered when is interfaced with an ATI tool changer or something similar ? My first thought is that on both sides of parts is a F/M connectors ...
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0answers
12 views

TC-ER cable type for U/G installation

Can I use TC-ER type cable for Underground installation. Underground installation is in PVC conduits (schedule 40). PVC conduits are protected using lean concrete (sort of duct bank)
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1answer
58 views

Capacitor question - energy from pushing a baby stroller

I’m making a circuit that will be added to a stroller. With a 24 volt DC motor, I’m trying to power the capacitor by walking around & simulating a baby/mother experience and if I run into a hill ...
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0answers
63 views

Make Input and Output circuit really I/O

I currently have a self designed I/O board. I'm using the LPC1768FBD100 Microcontroller NXP 3V3 and created 20 inputs and 14 outputs. My design allows only inputs to be inputs and outputs to be ...
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1answer
50 views

Sensor with integrated ID

I'm looking for another solution to a problem. I have 4 of the same infrared sensors which detect if an object is close or not (pretty simple). The difficult part now is that they don't have an ...