Questions tagged [electrical]

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2answers
92 views

Does this look like a correct Bandpass filter?

A project task assigned me to make a simple series RLC bandpass filter with values B = 73kHz & freq center = 4.8MHz known. I use equations B=R/L and fc=1/(2pisqrt(LC)) to get the RLC values. ...
0
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2answers
180 views

\$pV/\sqrt {Hz}\$ in Power Spectral Density

I am trying to plot a Noise Spectral Density from 10 kHz to 1 MHz. The Graph shows a cure which at 1 MHz the noise is 76 pV/rootHz. I am unable to understand that unit definition here. Becuase the ...
0
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1answer
124 views

what is the German/Austrian nomenclature(Voltage and current direction) in electronic circuit?

AS I came from a country where we use the french system in defining the voltage current arrows in electronic circuit, I am confused about the German/Austrian system where I see the voltage arrow is ...
1
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1answer
2k views

How can 400V & 690V on e-motors result in the same power

Forgive my ignorance, but how can two 3-phase ratings on the same motor result in the same output power? The one I have is rated for 0.7kW in triangle for both 400V and 690V.
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2answers
152 views

Ohms law and LED driver efficiency? How can this possible be true?

I am having a meltdown with a Chinese supplier at the moment and hope dearly that someone can help. I have an LED driver that is in my mind 28.8W. The output of the driver is 48 V @ 600 mA (48 V x 0....
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1answer
94 views

Need electrical schematic of this component

For my graduation project I need this converter but I would like to have the electrical schematic. This is the link to the store where I bought the part. That's all I know. I have looked up the chip ...
2
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4answers
104 views

Generator to home wiring

I live in South Florida an as such need to have generators for hurricanes. I have 2 Generators, a small 3300 Watt Inverter and a big loud 9000 Watt generators. Edit: My plan is to use only 1 ...
0
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1answer
171 views

Synchronous Motor Power and Frequency Relationships

I'm having a difficult time trying to understand what effect the frequency of a power supply has on the power of a synchronous motor. For example, if the supply frequency were to increase from 50Hz ...
0
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1answer
76 views

Can you convert two wire 220 (no neutral) to normal 110?

We have a water pump way out in the field (500+ long wire run) that is wired for 220 with two wires - no neutral. It would be very, very convenient to have a power outlet at this site for tools, etc. ...
1
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1answer
30 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
80 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
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1answer
174 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
131 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 ...
2
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1answer
87 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 ...
2
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0answers
122 views

Please help identify this vintage component [closed]

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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1answer
25 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
85 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
103 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?
0
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1answer
17 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
104 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
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1answer
94 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
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1answer
78 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
53 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
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1answer
182 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
203 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
194 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
2k 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
114 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
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1answer
60 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
636 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
54 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?
1
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3answers
985 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.
1
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2answers
151 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
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1answer
61 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
171 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
1k 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
370 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
411 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
191 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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2answers
379 views

What glue used here?

What glue is it? Is it safe for attaching?
0
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0answers
53 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
67 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
65 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
64 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 ...
24
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3answers
3k 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
430 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
184 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
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 ...
3
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5answers
188 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 ...
0
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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 ...