Questions tagged [line]

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3 votes
2 answers
148 views

Why is the insulator missing for one of the transmission lines?

Why is the insulator missing for one of the transmission lines? Apart from the top line (earth) I would assume that all the other lines need an insulator. It's the same for the next poles. This is in ...
Johannes's user avatar
  • 237
0 votes
4 answers
254 views

Using 110V plug on 220V line

It might sound weird but I want to use 125V plug on 220V line. The plug is US type (type b) but I live in EU now. I'll change the outlet with US type outlet and also my cables has US type plugs on. ...
kokojuh's user avatar
  • 11
0 votes
1 answer
54 views

How to use the Load Line technique to intersect two dynamic electrical components?

I have an incandescent bulb in series with a battery and a constant voltage source (a charger), and would like to work out the current drawn for a given input voltage from a constant voltage source (...
killingtime's user avatar
0 votes
1 answer
177 views

Parallel resistor in line-level output

I have a mono line-level output and I want to share it with two devices which will receive the line level output and use it. In one of those devices I need to use a 10 kΩ potentiometer in order to ...
amandanovaes's user avatar
0 votes
1 answer
151 views

Line level voltages clip indicator

I'd like to implement the clip LED indicator for the SEND outputs of my module. This schematic from «Elliott Sound Products» seems to be sufficient. What is the PRO line levels voltages that I have to ...
Roman's user avatar
  • 291
0 votes
3 answers
236 views

Using the same power supply produces no sound [closed]

AS SOME OF YOU ASKED, here is the video showing the connection and the problem: https://photos.app.goo.gl/GRsxQ783Rec6jVxo6 One clue that I got today: the problem happens EVEN if I disconnect the ...
user314164's user avatar
0 votes
1 answer
118 views

What is the mechanism for charge distribution in an infinitely long conducting wire?

If we supply along conducting wire conductor an AC supply, is the charge distribution inside the wire similar to the image given below? Also, do electrons push each other to generate this charge ...
Mrunal Shinde's user avatar
0 votes
2 answers
742 views

Convert speaker level to microphone level

I have a digital piano without line output (not even earphone output) but I would like to record what I am playing. So I decided to convert the speaker level to mic level so I can record the audio in ...
user314164's user avatar
0 votes
1 answer
475 views

Analog telephone circuit and TEA1062 [closed]

I am currently working on an analog telephone project. I have some questions. ICs and Central are below: Central: KX-NS500 (gives 28VDC) DTMF receiver: MT8870 DTMF generator: HT9200B MCU: ...
Firat Dagkiran's user avatar
2 votes
2 answers
2k views

Line level to microphone level to record

I have a digital piano with an earphone output where I can connect a simple earphone (like in the picture below.) It works fine. I would like to connect this earphone output to my smartphone jack (...
user314164's user avatar
0 votes
3 answers
876 views

Voltage divider from speaker to line level generates noise/huming

I have a really old device and I can only access the speaker wires of it. I want to setup a line level from the speaker so I can connect it to another device. I used a very simple voltage divider (2 ...
user314164's user avatar
2 votes
1 answer
424 views

Conceptual understanding of phase power vs. line power

I am looking at two formulas: P = √3 x VL x IL x Cos Ф P = 3 x VPh x IPh x Cos Ф Now assuming P here refers here to the total power. Could I take VPh and IPh and combine those terms as P (Phase)? Same ...
Coconut's user avatar
  • 23
0 votes
0 answers
107 views

Modeling three phase load for EV charger

When designing a power system to supply EV charging stations, are the stations modeled as delta loads or wye loads? Slightly off topic but is it standard practice to assume that three phase loads are ...
Coconut's user avatar
  • 23
0 votes
2 answers
105 views

How does line capacitance of overhead naked lines change with rain or snow?

Does line capacitance change with rain or snow? If yes, does it a lot (or is there a study that quantifies the change)? I ask it because I am studying the tuning of a Petersen coil, and I want to know ...
Samuele Benito Di Gioia's user avatar
3 votes
3 answers
218 views

Half-wave rectifier- How does the supply line current affect a transformer

i Have this half-wave rectifier circuit. i have placed a current probe on the input in order to measure the waveform of the supply current. The waveform is shown below. My question is what effect does ...
Frantisek Balaz's user avatar
1 vote
1 answer
107 views

Is it okay to assemble Li-ion cells all in line (series and parallel)?

Could there be some practical issues when operating a lithium-ion battery pack that consists of cells all in one line? (for instance, at a +/- series connection, individual cells within the first ...
Strayed101's user avatar
2 votes
1 answer
263 views

How to extend a connected graphic lines in KiCad 6?

How can I extend or decrease the length of a connected graphic line in the Schematic Editor of KiCad 6? Below is in blue ovals the pictogram and two examples marked. I can remember I could change the ...
Michel Keijzers's user avatar
0 votes
1 answer
218 views

Headphones on a line output (vs. headphones output)

I'm designing a device using a DAC (TI PCM 2704 like this one to be precise,) and optionally a headphones amplifier. I noticed that connecting (32 Ohms, closed-back Beyerdynamic) headphones to the ...
Basj's user avatar
  • 1,906
0 votes
1 answer
96 views

Impedance matching at the generator side or the load side?

For impedance matching, are we matching in between the generator impedance Zs and Zin, or matching between the Z0 and ZL? or both? Similarly do we add the matching network in between Zs and Z0, or Z0 ...
kintaro's user avatar
  • 327
0 votes
0 answers
100 views

Amplifying long run wiring to addressable WS2815 LED 12V to pool line noise issues [duplicate]

I amurrently working on running WS2825 IP68 lighting (finishing up) in our pool along with LED lights. After moving the controllers to a centralized location, we have been having issues (lights ...
LGTZ73's user avatar
  • 19
0 votes
1 answer
724 views

In a delta wound 3-phase motor, how are the phase and line voltages equal?

After researching the 3 phase delta configuration, I'm confused as to how these three line-to-line and phase relationships can all be true. I have found the voltage/current relationships here , and ...
Lukaku's user avatar
  • 1
0 votes
0 answers
29 views

Insulation and losses In transmission line

Why do we consider only P=V.I In AC transmission while designing the insulation of transmission line not the equation P=V^2/Z and consider this equation in determine the insulation in DC transmission ...
Sudhanshu Ranjan's user avatar
1 vote
0 answers
599 views

Calculating the line-to-neutral voltage of a generator

A three-phase generator is connected to a strong grid with line-to-line voltage 14 kV and frequency 50 Hz. The generator is rated at 15 kV and 180 kVA. The resistance in the windings is 2 Ohm/phase ...
gripen's user avatar
  • 63
0 votes
1 answer
458 views

Reliable 110 & 230V AC line detection on 3.3V GPIO

A manufacturer provided the following circuit, to detect AC line voltage in a small IoT module (non-isolated power supply). SW1 is pulled up with an external 10 kOhm resistor and connected to the ...
floyd's user avatar
  • 99
0 votes
0 answers
243 views

Pinball keeps blowing transistor

I've a pinball machine that keeps blowing the transistor for the flipper coil. The flipper coil has a diode across the lugs. This tested good but I replaced it with a new one anyway. Still blows ...
maestro's user avatar
0 votes
1 answer
59 views

Electromagnetic farady's law direction

I have a question about direction of vectoral line integral in formula of electric potential and electric field. In electrostatic I assumed \$B\$ is positive potential and \$A\$ is negative potential ...
Tesla058's user avatar
0 votes
1 answer
629 views

for calculating the number of insulator disks needed for creepage is line to line voltage or phase voltage used?

For example, I am calculating the number of disks required for a 330kV line. Assuming medium pollution (20mm/kV) and each disk having 405mm would my number of disks be 17 (based off line voltage) or ...
Chris's user avatar
  • 1
1 vote
1 answer
132 views

What is the meaning of load of a line?

in Powerworld there is a function called ''line flow pie'' which indicate the percentage of load of the line. But what is it? I think that it is the ratio between the current on the line and its ...
Samuele Benito Di Gioia's user avatar
2 votes
2 answers
114 views

Input power protection for PAN4820

We want to design a telecom compatible power entry circuit with 48V 20A rating for a student project (design of a telecom equipment with 48V DC input power) using PAN4820 devices. The schematic ...
Mojtaba Rezapour's user avatar
2 votes
1 answer
86 views

Help in understanding Audio line output stage

I was trying to understand the audio line output schematic shown below but couldn't make sense of it. This circuit comes after the output of an Audio DAC PCM1725, followed by an active 1st order low ...
nonius's user avatar
  • 97
0 votes
0 answers
198 views

Programmable delay line IC

I'm currently redesigning a delay line circuit. It is implemented on a Xilinx CPLD IC. Minimum delay is about 200 ns and maximum 600 µs, which is enough range for my project. What I want to do is ...
mil's user avatar
  • 11
0 votes
2 answers
214 views

How do I turn off multiple data connections with a single switch? [closed]

I am pretty new to electronics but so I've been doing a lot of reading and whatnot. I have a question I can't seem to find any information on. I am modding a handheld device (the device in question ...
user avatar
2 votes
2 answers
175 views

Can I improve serial data signal using reversed output on a twisted pair?

This is a serial data communication with one or several transmitters and one or several receivers. From the transmitter I have one serial data output (D+) and a second, reversed serial data output (D-...
Fredled's user avatar
  • 2,243
1 vote
0 answers
151 views

Transmission Bus Admittance Question

I have a question about calculating the admittance between buses in the single line diagram shown below: The solution I have been given shows that the admittance between bus 2-2 is found by adding ...
David777's user avatar
  • 1,578
0 votes
0 answers
27 views

Current Amplitude Distribution Lossless Transmission Line

I need to proof that the formula for Current Amplitude Distribution in a Lossless Transmission Line it's the following and I don't know where to start from... A little help would be appreciated. ...
user avatar
1 vote
1 answer
314 views

Audio line level conversion from consumer to unbalanced (presumably) pro 1/4" jack of unknown sensitivity and impedance. 400W 1980s PA amp

I have a lovely pair of speakers that achieve their almost flat response by dampening spikes. Consequently they eat amp power for breakfast. I have been given a 400W RMS per channel 19" rack mount ...
Rinderpest's user avatar
2 votes
5 answers
1k views

What are the reasons behind marking neutral and line terminals on a power supply AC input?

Even though AC has no polarity, almost all the power supply AC inputs or most AC powered device input terminals indicate line and neutral terminals as L and N just like in the following example: Is ...
user1245's user avatar
  • 4,093
0 votes
1 answer
95 views

Line Filter in Power Supply question

I have faulty power supply in my digital reverb unit and after replacing all capacitors the problem is still there - fast on/off switching with clicking sound. It does turn on sometimes though but ...
Radim Lycka's user avatar
7 votes
1 answer
766 views

Identification of a very strange SMD component

Could anyone help me identify what component this is? It is the white component with a black stripe. What ever it is, it appears to be a open circuit. I couldn't measure any resistance (or ...
xydn's user avatar
  • 71
3 votes
3 answers
4k views

What would cause a square wave to become rounded?

I have a square wave going through a thousand feet of cable. The cable has \$120 \,\Omega\$ characteristic impedance. I measured the capacitance and inductance of the cable and they are pretty close ...
user1416658's user avatar
0 votes
2 answers
137 views

Pspice modeling of transmission line

I'm trying to model a differential digital signal going through 4000 feet of twisted shielded pair. The nominal impedance is 120 ohms and capacitance per foot is 14.6 pF. For 1000 feet I calculated ...
user1416658's user avatar
0 votes
1 answer
817 views

NXP PCA9615 I2C differential buffer - failure on SCL line

I am using the PCA9615 part to extend an I2C bus. The PCA9615 converts I2C to a differential bus. PCA9615 https://www.nxp.com/docs/en/data-sheet/PCA9615.pdf There is a control box and a remote ...
Rudy's user avatar
  • 351
3 votes
3 answers
555 views

Is the impedance control of differential pair traces a transmission line problem?

I read in an article of design reference that "If the length of the interconnect PCB is greater than 1/10 th of the wavelength, we should consider using the transmission line instead of ordinary ...
asterix's user avatar
  • 101
4 votes
1 answer
214 views

how will a connector affect a transmission line?

I am laying out an RS485 driver and read a few design guides which recommend a 120 Ohm termination resistor. This makes sense since the characteristic impedance of twisted pair cables is in the 100 ...
Shamus MacDonald's user avatar
0 votes
1 answer
179 views

5 volt power supply directly from 120 volt

I would like to use a microcontroller to drive a TRIAC (Z0103MA0,412). The TRIAC will be switching a 120 volt a/c resistive load. I would like to derive a 3 volt or 5 volt CD power supply directly ...
user136789's user avatar
2 votes
2 answers
4k views

Sizing a motor for a conveyor

There is a plethora of information on motor sizing on the internet discussing the rated voltage, current, torque and power of the motor, and how these parameters should be selected based on the load ...
vasiqshair's user avatar
0 votes
2 answers
1k views

Can I connect a 16 ohm output signal to a line input if I use a resistor in series?

newbie here. I have a Hi-Fi system and I wish to connect its output to a line input in another system while still being able to hear through the Hi-Fi´s original speakers. If I use the Headphone ...
Javier González's user avatar
2 votes
1 answer
80 views

What are the series inductors used for in this filter?

Regarding the below filter, are the series toroid inductors at the very right end of the filter used for CM or differential mode filtering?: I think R and Cx are for differential filtering. And the ...
user1245's user avatar
  • 4,093
1 vote
1 answer
579 views

How Does Line Frequency Affect Coils of a Contactor?

I am using a generator as my source voltage, which produces 240VAC @ 240Hz. I was planning to use the following contactor from TE: CONTACTOR 4PST 40A 240V In the datasheet it says this contactor's ...
Mark Wright's user avatar
2 votes
0 answers
631 views

Parallel transmission lines impedance

I just want to know the correct way to calculate \$Z_{in}\$ in this network. It's very simple but I think I might be doing something wrong. Is it ok to calculate the impedance over one line and get \$...
Feyneman 's user avatar