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Questions tagged [design]

The process of creating electronic products, including components and end-user devices.

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29 views

Minimal hardware requirements ESP32 WROOM

I've had a very simple PCB designed to supply the ESP32 WROOM module with power using a voltage regulator that supplies it with 3.3V. However, this does not seem to be enough to run the firmware ...
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2answers
74 views

How can I execute multiple for loops sequentially in Verilog?

I'm trying to turn on the LED lights on my FPGA Spartan board one at a time until all lights are on and then turn them off in the reverse order. I could easily do this in other OOP languages by making ...
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1answer
31 views

Error with reference to scalar wire 'reset' is not a legal reg or variable lvalue

I'm getting an error in Verilog with an input parameter it's not recognized as a legal reg or a variable lvalue. I had the same problem with the output in the module however it was fixed by labeling ...
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0answers
50 views

Laser Tag System Design Review

I have been working on a project to make my own laser tag gins and sensor vests. I have completed the electrical side of my design but this is the first time I have designed something like this and ...
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2answers
80 views

How much time does it take to increment one bit in Verilog? [closed]

In my lab I'm supposed to write a program in Verilog that makes a timer which outputs a tick every second. A counter module could be used such that as the counter increments to a specific binary ...
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1answer
39 views

Why Deliyannis bandpass filter with high Q does not have the expected transfer function bode plot

What i need is to design a delyiannis band-pass filter with Q enhancement technique. The theoretical analysis of this technique is referred here in pages 107-112. For those who don't know how to ...
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1answer
23 views

branch address computation single-cycle vs multi-cycle vs pipeline risc-v

I'm not sure about at which stage do the address computation take place at each of the versions of the risc-v? I just wanted to make sure i got that right- Single-cycle risc-v: Branch target address ...
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3answers
145 views

Lithium-ion battery charger circuit design [closed]

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a ...
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1answer
44 views

In this semi-ideal photodiode, what would be the physical interpretation of this current?

A real photodiode can be expressed as a circuit made of several ideal components, it looks something like this: simulate this circuit – Schematic created using CircuitLab I copied it from here ...
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1answer
47 views

Calculating H-Bridge without motor specifications [closed]

I am currently calculating elements for an H-Bridge for brushed dc motor and PWM speed control that operates on 6V and maximum current of 2A. However I want it to work with different 6V brushed DC ...
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votes
1answer
80 views

BJT amplifier design with input resistance, output resistance, and open-loop gain requirements

so currently i'm designing a BJT Amplifier with these requirements: Open-loop gain = 35 dB Input resistance = 600 Ohm Output resistance = 200 Ohm Another thing is the only BJTs I can use have hFE of ...
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0answers
58 views

Why are project files in Altium modified every time they are opened? Is there a way to prevent this?

I use Altium Designer 18. When I open a project file (.PrjPCB), the asterisk ("*") appears next to the project name indicating that the project has been modified, but I haven't actually made any ...
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2answers
76 views

What are some good tips for handling PCB design for a spartan-6 LX9 microprocessor implementation? [closed]

My team and i are working on a MIPS implementation using Xilinx spartan-6 LX9. We have a short deadline and we want to know what are some useful tips in terms of PCB design that would reduce the risk ...
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0answers
10 views

Adding position markers in HFSS

I need to add a position marker in HFSS something like a point or square so that I can draw a line between two points with a certain length. So it is possible to do so in HFSS ?
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1answer
91 views

Hardware design

Is there a way to actually build components on something like Xilinx ISE? i.e. MUX's, NAND's, AND gates. From what I've learned so far, one can only use VHDL to describe hardware and the compilation ...
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1answer
28 views

warnings “Xst: 1710 or 1895” in ISE14.7

i have a module, written in verilog, that gives me couple of warnings e.g. WARNING:Xst:1710 - FF/Latch (without init value) has a constant value of 0 in block . This FF/Latch will be trimmed ...
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2answers
97 views

Joule thief question

I am basically a rank "newbie" and the only electrical project I have ever undertaken was to take a "light fan" and rip it apart and glue magnets in it and with a pair of vise grips spin it around and ...
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0answers
14 views

How to find the peak current and Vswce of this IC - NCV3063 [duplicate]

I need to design a boost converter using this IC. From (7.5V to 16.5V) to 23V. Load current max is 255mA. I am having some difficulty in understanding some of the design calculation. How will I ...
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1answer
32 views

Soft-power on/off with ATMega/Relay causes brown-outs and unexpected voltages

This questions consists of two parts. Background I'm designing a digitally controller class D amplifier. Main IC's are a TI TPA3116D2 Class D amplifier, a TI PGA2311 volume control and an ...
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1answer
27 views

led SMPS converter

Which type of converter is best for an LED light for getting better efficiency and high colour rendering index? We want to design a converter up to 80 Watts which gives indirect lighting and less ...
1
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0answers
60 views

Fractal Antenna Design

I am trying to design a monopole fractal antenna using HFSS. My problem is with the excitation, I am trying to excite it with a connector with three terminals, where the middle terminal will be ...
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3answers
62 views

Alternative to alternating relay? or help?

I'm using a littelfuse relay shown in the link to switch motor directions. I'm sending a pulse to the relay switch of 0.02s in order to switch between the L1 and L2 contacts. The pulse seems to be too ...
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1answer
41 views

Help needed for HV DC/DC converter

I need to design a boost converter that outputs ~20 mA DC and an unloaded voltage of around 68-100 V. The inverter will be part of a Zener diode analyzer. I built it on the idea of the Joule thief (...
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4answers
123 views

Circuit to convert 24VAC digital signal to 5V DC digital signal

I am designing a circuit to convert 24VAC signal to 5V DC signal. The 24VAC signal is designed where 24VAC is on and 0VAC is off. The signal needs to be fed to an MCU which is 5V DC. The circuit ...
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2answers
144 views

Designing a RAM, using 4x2 chips, with a 8 address capacity

This is a typical exam question, and I've seen some very helpful posts about, but I still have a lot of doubts. Given an integrated circuit of certain dimensions, for this example a 4x2, I have to ...
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2answers
119 views

First pcb design is it safe?

I have designed a pcb board (2 layer) that deals with high voltage 220VAC and it also converts it to 5VDC and 3.3VDC. So, because it is my first design and I deal with high voltage I want to be sure ...
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1answer
44 views

LED current source circuit design concerns

TL;DR: Read the bulleted list below. I am designing a simple constant current source to power up some LEDs inside arcade buttons. My project consists of 20 of these buttons. Every button is ...
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0answers
47 views

JFET Voltage Divider design question

I've been trying to get this question done for a couple of days now and no matter how much I try I've been unable to get it done. Your help in this question is greatly appreciated.
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4answers
1k views

MOSFET W/L ratio limits: what's (un)reasonable?

The answer to this question is probably process-dependent, but what are the limits of the W/L (gate width/gate length) ratio for MOSFETs? I don't know what is in the realm of the insane. I saw a ...
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1answer
61 views

What to do with unused pins for this ADC?

For my senior design project I'm using this ADC (HMCAD1511) https://www.analog.com/media/en/technical-documentation/data-sheets/hmcad1511.pdf I'm only using one of its four analog inputs - what ...
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3answers
157 views

PCB Trace Widths? [duplicate]

I am designing a circuit board using proteus 8.1 , does anyone know how to calculate trace widths for the PCB tracks , it may need to handle a high current so it’s important this is all calculated , ...
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2answers
149 views

What step have I missed designing this differential amplifier?

First time posting on EE.SE and I hope this question isn't too broad. This will be a long post. I should also point out: I'm asking the process and not the solution the problem. I've did create a ...
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1answer
93 views

I have a college senior design question [closed]

I'm in my second to last year of mechanical engineering. So next year I'm going to be going into senior design. For those that have gone into any engineering course and have done senior design ...
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3answers
69 views

Single Cell Battery Protection ICs

I'm designing a product that will be powered by a single 18650 cell. Specifically, I am basing my numbers off this cell in particular: Samsung INR18650-25R It has a typical full voltage of 4.2V ...
4
votes
1answer
149 views

What determines Nixie tube digit stack order?

I recently watched a video of Nixie tubes being built and another user had asked what determines the stack order of the digits in front of the anode. I searched around trying to find the answer but I ...
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1answer
57 views

Low power design, choosing correct buck-boost converter for LiPo battery

I want your opinion on subject considering low power applications. I want to build basic loraWan tracker with Murata Lora module(3V3), and I want to use LiPo battery. What Im struggling with is power ...
4
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3answers
271 views

How to provide version numbers to hardware schematics / PCBs?

I have one hardware design developed for a customer. We are also selling the same for some more customers with small modifications I would like to know how to provide version numbers for these ...
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2answers
166 views

Advice for 25-50 Mbit SPI lines - PCB design

I would like to ask some advice for my layout design. I am working on a layout design. The designed PCB will be a Beaglebone Black (BBB) extension card. It is a four layer PCB with the following ...
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0answers
75 views

What do TA, TG and M mean on the scheme?

I have a electrical scheme but I can't get what do TA, TG and M mean? Can anyone explain me? P.S. I am a programmer, not an electrical engineer, so maybe it's a trivial question.
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0answers
42 views

Are GX12 connectors in common use? Is there another name for them?

I have a project where I need to send NeoPixel data from an RPI "base station" to a neopixel art project. Both the base station and the art project are enclosed already. Length is short, just a few ...
2
votes
1answer
235 views

Reasons for choosing a transistor instead of an op-amp as a buffer

I have often seen circuits for guitar pedals that use an emitter-follower configuration as the input and output buffer (see example below). If an op-amp can provide a greater input impedance / lower ...
1
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1answer
55 views

How to optimze a coil for needed voltage?

Faraday's law for a coil is : V = A * M * N Where: V = Peak output-voltage A = Area of the cross-section of the wire M = Rate of change of magnetic flux in the coil N = Number of turns of the ...
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0answers
22 views

CST Studio Space State Matrices

I am new to using CST Studio and I am trying to figure out how to see the state space matrices (A,B,C,D) of a designed antenna to describe its radiation pattern in other software. Any help on the ...
6
votes
3answers
2k views

Is it ever bad to run an IC VCC trace next to a ground plane with 1mm clearance?

Since my last board flopped, I looked at it again and noticed a ground loop (because the DB9 casing completed the loop). Now I adjusted my board so that there is no loop of any kind. Instead, I'm ...
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2answers
152 views

Is this speaker crossover design correct?

This is the schematic for 2-way crossover, the speakers I want to use are: Woofer: https://thomann.de/pl/harley_benton_15tb065_b4.htm?o=2&search=1537173360 Tweeter: https://thomann.de/pl/...
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1answer
95 views

Horn antenna for radar sensor

I have InnoSenT SMR-314 and SMR-334 radar sensors that have quite wide horizontal radiation pattern of over 100 degrees (see datasheet on page 3). I would like to make the sensors far more directional ...
5
votes
1answer
164 views

Flat Yagi antenna Enclosure

So, I was annoyed that my Yagi antenna was enclosed in a plastic-tube, which lets it roll around and fall off the table occasionally, but without its enclosure the elements hooked in anywhere. So I ...
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0answers
223 views

Using a comparator in tinkerCAD circuits

For anyone familiar with the TinkerCAD circuit design tool I am trying to create a simple circuit for an 'LED chaser' pattern (this is what I have seen it called elsewhere). In order to create this ...
3
votes
1answer
131 views

Why build very similar diesel-electric engines in both AC and DC traction versions?

I'm reading Wikipedia on GE Evolution Series diesel-electric engines. The series includes ES44AC and ES44DC models. Looks like they are very similar but one uses AC traction and another uses DC ...
16
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5answers
2k views

Possibilities for allocating memory for modular firmware design in C

modular approaches are pretty handy in general (portable and clean), so I try to program modules as independent of any other modules as possible. Most of my approaches are based on a struct that ...