# Questions tagged [network]

Questions related to the interconnection of electrical components. Consider using "circuit" if they are in a closed loop.

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### General solution for the impedance of a finite ladder network with different series and parallel impedances

I am trying to find the equivalent impedance of a network that has a structure like this: I have attempted to use MATLAB with the Symbolic Toolbox to find a solution for the equivalent impedance with ...
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### Sending arbitrary bitstream to SFP transceiver: minimum bitrate?

I'm trying to use a Small Form-factor Pluggable (SFP) as the laser source for a homebuilt laser gas analyzer, which means I don't actually care about transmitting data. The plan is to send an ...
157 views

### Powering LED from a CAN bus signal

I am looking for a can it be done and, if someone is willing, a how to. I am building an OBD2 breakout box for easily scoping automotive computer data lines and want to add LEDs as a quick visual of ...
70 views

### The maximum distance supported between two nodes in an ESP32 based mesh network

What is the maximum distance supported between two nodes in a network implemented using the ESP-WIFI-MESH protocol developed by Espressif Systems for their ESP32 modules? The documentation mentions ...
51 views

### Why does each mesh equation give different I3 value? What's the correct value and final answer?

The provided solution considers the third eqn as the correct one and proceeds with the same alone. Why is the answer achievable only thru the 3rd mesh and why not the first two? Why are they giving ...
492 views

### Network analysis Kirchhoff

How can you set up a system of equations for branch current analysis if there is a current source in a branch, such as the current source with the source current i02? The values of the components​​can ...
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139 views

### How to do an electrical network analysis?

I'm preparing for an upcoming exam in electrical engineering and came across this task. My question is: Which method is best for this? I think the superposition principle would be very complex, right? ...
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24 views

### Network bus with tree topology with network exploration

I am planing to experiment with Arduino framework to create a network of microcontrollers, where they communicate with each other. There will be one master and this should be able to explore the ...
1 vote
78 views

### Network Theory > Dependent Source | The answer is 84W but how come it is 84W if V0 only is coming 17V

If I solve this question using KCL then take 5 + V0 at position b then By KCL (5 + V0)/1 + (5 + V0 - 2V0)/2 + 1 = 0. Solving this will give V0 = 17V. Why is power 84W?
1 vote
187 views

### Min and max resistance of this network with potentiometer

As the 20 kΩ pot is adjusted from A to B, any idea what the minimum and maximum Thévenin resistance is between C and D? Any thoughts on some equations?
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1 vote
258 views

### How to write the equation for the input side of a JFET?

I have been reading about the voltage gain of JFET, but I am unable to understand how to write the equation for the input side. Can somebody explain the method to write the equation for the input ...
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### Delta to Y with sources?

I'm wondering if this transform is possible: I tried doing a source transformation to change this to a regular delta network with two current sources going to nodes a and b, but wasn't sure how to ...
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### Two-port network

I have been trying to solve a problem on two-port network but I am getting two different answers: APPROACH 1: In the problem the Y-Parameter is given so I converted Y parameters to H parameters and ...
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180 views

### Two port network analysis

In the given problem we were required to calculate the input impedance of the given two port cascaded network. So my approach was that I first calculated the transmission parameters as given below ...
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### Mesh analysis of circuits

In this question we are required to find the nodal voltages and current in the circuit. Why is the 3A current not divided at node (d), that is, one going in 5 ohm resistor and other towards the ...
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### NIC network circuit with grounded output?

My class was given a series of circuit networks to calculate the transmission of the system. One of those networks is this type of Negative Impedance Converter with the common ground output. How can I ...
275 views

### My wiznet 5500 ethernet circuit is not working ( using it ESP32 s3 )

I made a custom PCB board with w5500 ethernet IC and ESP32 S3 module and it's not working at all, even the RJ45 connector LEDS aren't responding when powering the circuit. here's the schematics of my ...
1 vote
104 views

### ENC28J60 fails after some time of constant operation

Context: I have designed a custom pcb utilizing the ENC28J60 ethernet chip to be used with raspberry pi. The board has 5V in which powers both the ENC28J60 (through a AMS1117-3.3 LDO regulator) and ...
1 vote
659 views

### What is the current through the resistor?

In the figure we are supposed to find the current in 8ohm resistor. So by using simple KVL rule I was able to figure it out to be -1.25A. But in the second approach When I calculated current in 8 ohm ...
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### Delta-Wye for voltage sources?

My question is if, and how I can find an equivalent network, which includes resistors and voltage sources in series with arbitrary voltages and resistances, so that to the outside the networks are ...
1 vote
226 views

### Why are the TX+ and TX- pins on my laptop's Ethernet port shorted?

I understand that these are supposed to be differential signals with a resistance equal to the characteristic impedance of the cabling between them. However, using a multimeter to check the continuity ...
1 vote
96 views

### Direct Ethernet link between Raspberry CM4 and Jetson Orin Nano

I need to have high speed communication between Raspberry CM4 and Jetson Orin Nano modules on the same PCB. My question is: can I route them through Ethernet directly without the need for an isolator ...
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67 views

### RC timing circuit using a 2N3904

I have a 12VDC source driving an LED thru a 2.4K resistor. When a 12VDC control turns on I want power the base of a 2N3094 thru an RC network to drop the LED voltage to 0 in .5 to 1 second. I ...
472 views

### Finding equivalent resistance if each resistance is 100 ohms

The method to follow here is wye delta transformation, the resistors across red and purple nodes are in series so 2R and using delta to wye in green-pink-blue, and pink-black-blue after that there are ...
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96 views

### How do I know when a circuit is unsolvable?

I know 2 formulas for basic cutset and loop, which is a number of equations that need to be solved circuit. But it does not mention when a circuit will be unsolvable. If number of equations become ...
1 vote
137 views

### What is Cat 6 cable DC isolation?

What is the DC isolation of Cat 6 cable, between different pairs and between same pair? I could not find this information in the cable manufacturer's specs.
481 views

### Rollett stability factor - derivation and numerical meaning

For two-port networks, a value called the Rollett stability factor, K, can be derived, whose value can then be used to assess one of the criteria for the network to be unconditionally stable (K > 1)...
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### Synthesis of Analog Circuits With a Desired Input and Output Characteristic

Before this I have always worked with digital circuit synthesis. I have designed circuits with combinational logic using Karnaugh maps, decoder encoder shift registers and so on. And I have designed ...
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### Solving the problem of connecting a high-current, single-phase load to a three-phase balanced network

I am an electrical technician working in a hospital. In the laundry room, all the cloth washers contain three-phase motors which are balanced loads connected to a 140 A circuit breaker. The ...
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### Wi-Fi (esp8266) Point-to-Point Connection

Is it possible to have a point-to-point connection over Wi-Fi, similar to how an RF Module would work. No connections involved, just sending or receiving data packets to all nearby networks. I am ...
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1k views

### Is it possible to use basic networking on an FPGA without an OS?

I need to set up networking (just a basic echo server) on an FPGA board (ZYNQ Ultrascale+) using only the PL side. The end goal is to DSP a large amount of data coming from a receiver through ethernet....
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### How to proceed with Thévenin

Find the short circuit current with respect to A and B. When applying Thévenin's theorem to find Isc the 4 Ω resistor becomes 0. How to proceed further?
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### Why are non-conductive circuits designed on PCB？

This is the PCB of the network communication industry. What I know now is that after adding these redundant non-conductive circuits, the performance is improved from Cat3 to CAT5e. I really want to ...
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### What is required to create an offline TCP communication network?

I am designing an offline network consisting of a set of microcontrollers, with Ethernet capability, acting as servers, and a Raspberry Pi acting as a client for data collection. The controllers are ...
44 views

### How do modulations depend on transmission media? [closed]

or how is transmission media affected by modulation? Is there any relationship?
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### Is it possible in Profibus DP that slaves can talk each other?

I could not understand what Profibus DP is. Is it only I/O system which is controlled with a PLC or is it a complete bus system which controls the data traffic? If the second, I would like to ask if ...
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1 vote
104 views

### EEPROM size & Managed Mode vs Unmanaged Mode Ethernet Switch

I want to understand 2 points in Ethernet Switch ICs. In this IC - LAN9353, on page 34, the description in the table is mentioned. "A low selects 1K bits (128 x 8) through 16K bits (2K x 8). A ...
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### What is the current across the resistor given in the figure? [closed]

The circuit is short circuit across the the resistor. What will be the current flow across the 30 ohm resistor?
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### Reflection in optical fiber

I took a measure (OTDR) of optical fiber from the headend and I got this : In 10.7km The optical fiber have a "reflection". This reflection is holding 500 meters. After that reflection down ...
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### Guidance on cables in parallel from visualisation

I've been told cable 1 is in parallel with cable 2 and 3 yet I'm not visualising it just yet. Could someone clarify whether it's that from the source there are 2 paths? Cable 1 and cable 2-3. Thanks