Questions tagged [electrical]

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21 views

Basic MOSFET small signal model with no load and Rd

I've come across the most basic small signal model of the MOSFET. We have a NMOS whose drain is connected to Vdd= 5V and source is grounded. We also have biased gate with a DC 2V. Suppose the ...
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2answers
57 views

How to select a Relay that can handle a load of 42V, 3A DC?

I want a relay that can be controlled by a Raspberry Pi and can handle a load up to 42V and 3A DC. I was looking at this: relay which is rated at DC 30V/10A. Although, 30V is less than 42V but I was ...
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0answers
36 views

Windows calculator using engineering notation [closed]

I just wanted to hear if anyone can recommend a free, good electrical engineering calculator program for Windows (I know of Mathcad, but that is expensive)? Specifically one using engineering notation ...
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1answer
44 views

Is it possible to use adapter as a charger? [closed]

I have a 8V battery and a 5v,600mA output adapter. so i needed to charge the battery using this adapter,is it possible? when i connect my battery to adapter, the adapter power led is glow. is it safe? ...
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2answers
146 views

What are the two sensors doing in the automatic bread production line? [closed]

I want to know what is the name of these 2 sensors and what function they perform Some of you were complaining about the picture quality. It is the highest quality image I can get. Also these sensors ...
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2answers
65 views

Led ON on Spike Guard Even When Switch is OFF [closed]

I have this spike guard and it's middle led is ON even when the spike guard switch is off. I can see there are various combinations of the led and their meaning. But I see the middle led on when the ...
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2answers
79 views

Relay always damaged in switching circuit

I have a simple relay switching circuit which is used to turn off/on the power supply to a laptop. SPDT Relay is 8A , 440AC part number--> G2RL-24DC. The relay always gets get damaged - the ...
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1answer
32 views

Protecting equipment submerged in water against earth fault - RCCB vs MCB

I would appreciate help understanding the difference between an RCCB and MCB in the context of the situation I'm sharing below. I have a mini fountain pump in my pond which doesn't have any earth pin (...
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1answer
16 views

How much high is the amplitude of stator-MMF of 3-phase 2-spp integral slot winding type machine as compared to 3-phase1-spp machine of same type?

Details: No. of POLES=2; i.e 1-pole pair SPP= slots per pole per phase In my case, amplitude of MMF of 3-phase 1-spp machine= 0.75; Then what should be the amplitude of MMF for 2-spp machine ? Is it ...
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1answer
38 views

How to design an amplifier to meet particular specifications

I need to specify the (W/L) ratio of transistors and the value of the current source in an amplifier as shown in this picture so that these specifications are met: *the height of the input step for ...
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2answers
37 views

Insulate active or neutral?

If you can only insulate active or neutral, which should you choose? Does it matter? Is it important? Is one better than the other?
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3answers
71 views

3.7 V to 12 V boost converter - effect on cell

If I boost a 3.7 V 18650 battery to 12 V with a boost converter, would it affect the durability of the battery? For example, if I have a 2100 mAh Li-ion boosted to 12 V, would it affect the 2100 mAh ...
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1answer
50 views

Ohms law, resistance calculation

I'm new to electronics and I don't understand why you subtract source voltage by the components recommended voltage, but you just divide by the recommended amps... Why don't you subtract source amps ...
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0answers
17 views

200 A service upgrade [migrated]

I want to install central air conditioning in my home but my current service is 100 A, I Believe. If I were to upgrade to the 200 A service, could the breakers be configured where I have 2 100 A main ...
1
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1answer
46 views

How to calculate the lethal amount of current for given amount of output voltage?

I have some electrical parts that I was planning to reuse, things like laptop chargers and some parts from a printer. I searched google for what's the lethal amount of current and they mention 10ma is ...
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2answers
47 views

A generator would need to produce 'x' Volts in order to provide 'y' Amps? Am I understanding this correctly?

Let's say I have a device that requires 190A to work. My generator has an internal resistance of 2 Ω. The device has a resistance of 0.3 Ω. This would mean that the load on the generator is now 2.3 ...
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1answer
29 views

What is the best way of connecting electricity fuse/cut-out

I am talking about home/industrial electrical fuse fitting or correct mointing . Should the fuse be mounted on L(live) wire or N(neutral) wire?.
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0answers
21 views

Consider lowering VDD to save power in a static CMOS gate. Also scale Vt proportionally to maintain performance

Will the dynamic power consumption go up or down? Will the static power consumption go up or down? Explain with proper analytics. I came accross this question while solving a question booklet issued ...
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1answer
44 views

About signal conversion

Question is weird but it's about something that I really want to try. AC power here in India has 50Hz frequency. What I really want to try is to make a series path with two continuous conversions. In ...
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1answer
26 views

Coaxial cable test with VNA to estimate Wave Velocity and Attenuation

I'm doing a lab course concerning microwave measurements, during which I'm supposed to test an open, short and 50 Ohms terminated coaxial cable. The cable is connected to a VNA at the S_11 port and ...
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3answers
41 views

Calculate the phase angle

I have a question about the sign of Δt : Why is Δt in in this one positive And negative for this one below ?
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1answer
66 views

Is it safe to bundle together 380V cable + 24V signal cable + network cable?

I have the following cables between two machines: 380V 3-phase power cable 24V signal cable EtherCAT cable I would like to create an interface using a modular connector such as the one in the ...
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1answer
34 views

I have been designing a micro strip patch antenna with inset feed and I have a few HFSS simulation questions

Substrate dielectric: 3.5 Substrate height : 1.5mm Frequency: 2.5GHz I followed a particular video on YouTube to guide me, and used an online calculator for the width and length of patch, inset feed ...
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2answers
76 views

Is there a widely used vocabulary for electronics and electrical systems, much like the UMLS for medicine? [closed]

I am searching for an inclusive view and typology of electronic and electrical systems, and the design and engineering concepts etc. that underpin them. Is there a widely used vocabulary for ...
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1answer
41 views

Garage door openers - BLDC x AC monophasic - Is that possible?

As far as I know, electronic control boards for garage doors, they basically control two main types of motors: AC induction monophasic, one neutral and two phases, driven by TRIAC or relay. It takes ...
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2answers
70 views

How does equipment ground protects us from electrical shock?

What I have always learned is current leave the source and return back to the source, forming a closed circuit, here are the two thought experiments I had and got confused: Scenario 1: Here I have a ...
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2answers
98 views

Do two active high signals cancel each other?

A tp4056's temp pin is pulled HIGH, so it disables the chip. I accidentally fed a high signal into that same pin and it enabled the chip again!, which has to mean the signal went LOW. Are these two ...
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3answers
56 views

POKO TD-169C Hair dryer circuit diagram

Can I replace the 1N5395 diode in this diagram with a FR157 diode? Basically I need to lower the heat of my hair dryer and I think the 1N5395 diode in this diagram does exactly this but I have only a ...
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2answers
37 views

Difference between reactive load and source?

Probably a silly question, but I am coming across terms like reactive power load and reactive power source in some articles in web. Does it matter if a reactive component is a source or load? Say ...
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0answers
26 views

All three indicators of a Spike guard/ Spike buster shining leading to shock like sensations

A standard Spike buster/ Spike guard has 3 LEDs in a horizontal line to indicate if the connections are OK, open or reversed depending upon which one or two of the LEDs are shining. This information ...
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0answers
41 views

What is the process behind the forming of a low voltage electrical arc?

I am trying to understand the exact process undertaken when forming a low voltage high current electrical arc, such as in a welding scenario. My understanding at present is that without a high voltage,...
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3answers
44 views

Filter passband amplitude ripple and group delay ripple (group delay variation)

Are they completely independent? or does one lead at least partially to the other?
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0answers
40 views

Specific Type Of Toggle Switch

I’m needing help finding/naming a specific type of on/off toggle switch, but can’t seem to find it by googling. Basically, I want a toggle switch like in the picture below that I can use to power on ...
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4answers
53 views

Posssible Delay for a electric circuit needed

While I know that it is impossible to slow light down I was wanting to delay an electrical response from a diode using either a resistor or a capacitor but I could not remember, which does which. The ...
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0answers
38 views

Is there a potential earth leakage or is it something else?

I'm facing an issue in my house since last Christmas. When the lights or appliance with motor in any room are turned off/on the TV would go out and come back on in a short span (as if the power went ...
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0answers
15 views

Tripping threshold question

The tripping threshold is between 0.5 and 0.7 times the rated voltage I will like to confirm the above statement. If my rated voltage is 215V, assuming we picked 0.5 setting, does this means that the ...
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0answers
15 views

Modelling internal fault in a transformer

I am doing an analysis of faults in transformers and i need to model internal faults in a transformer. Please do advise on how to model internal fault in Simulink. Thanks in advance
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1answer
20 views

DALI Lighting (IEC62386-209) and Command-In-Between

Good Afternoon, I'm having some trouble understanding IEC62386-209 section 12.7.3, which involves sending an "ENABLE DEVICE TYPE 8" command to DALI Control Gear prior to sending an extended (DT8) ...
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1answer
75 views

Please help me in identifying surface mount component

So I've accidentally knocked down a computer system used to take kitchen measurements. I've caused a short in the power supply which caused two SMD components to burn in the motherboard. I've ...
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1answer
44 views

Can I replace a 32 A switch with a 32 A MCB?

A switch for a water heater in my apartment is broken (image attached). It is an "Anchor Roma 32 Amp 1-Way Switch with indicator". Can I replace it with this or this switch? Would the installation ...
1
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1answer
21 views

Floating Nodes Error in Simulation in ORCAD PSPICE

Does anyone have any insight as to what exactly is wrong with my circuit on Orcad/PSPICE? My name is in the project name so I blurred it out for obvious reasons
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3answers
122 views

Assortment of electrical component for beginner [closed]

As a newbie in electronics when building projects with Arduino, sensors etc. on PCB I often have a problem with electrical components like capacitor, resistor, diodes, switches etc. For different ...
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1answer
47 views

Replace everything in the circuit except the 3 A source by its Thevenin equivalent circuit and use the result to find V1

Replace everything in the circuit except the 3 A source by its Thevenin equivalent circuit and use the result to find V1. This is my solution but the teacher said it is wrong and i do not know how to ...
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2answers
99 views

Male configured 'outlet' [closed]

All I can find is a female configuration like this, but need a male configuration.: BougeRV 50 Amp RV Power Outlet Box,Enclosed Lockable Weatherproof Outdoor Electrical Nema 14-50R Receptacle,125/250 ...
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10answers
1k views

Film/TV question: How to build Foam Cutter from only household items

I'm writing a scene for television and I need to make a foam/rope cutter from household items. I've watched several videos, including this one: https://www.youtube.com/watch?v=cM0lP2WCzY0, and ...
0
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1answer
27 views

What is sample rate of DSO and what if we have a DSO with low value for sample rate?

I bought a USB DSO and its sample rate is only 48MS/Sec. I never had any problems measuring normal signals from a function generator and other circuits. I have seen many DSOs with high sample rate ...
6
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1answer
96 views

Hair dryer fuse too low for spec power?

So I'm tearing down this hair dryer for a school project where I need to make it have variable heat and variable motor speed which can be controlled through an Arduino. I'm currently looking at where ...
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0answers
17 views

Noise Temperature to Noise Factor

If I have a noise temperature of (I'm not sure how to do subscripts) Te = T1 + T2/g1 and since Te = (fn-1)To. I believe that fs = f1 + (f2-1)/g1 But I'm not sure what the steps in between these 2 ...
6
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3answers
2k views

Operating principles of a sawtooth wave generator bootstrap circuit

In one of my assignments, I was asked to explain the working principles of the sawtooth wave generator shown below. The input voltage is a spiked waveform obtained from a differentiator circuit. I ...
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0answers
40 views

wiring for my timer switch

I'm trying to wire as per the following wiring diagram. I completed wiring as below, and timer is switching on, but at the programmed time, light is not switching on, anything wrong with wiring. See ...

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