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Questions tagged [design]

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

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2answers
75 views

Design a Circuit with Zero-Order Transfer function H(s) > 1

I know that if I do 2 1K ohm resistors in series, I can just do a voltage divider to get Vout/Vin = R2/(R1+R2) = 0.5. But if I want to get a transfer function of 3, what components would I use?
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1answer
46 views

Long Distance High Speed Wireless Data Transfer

What kind of device can I use to transmit data at a rate of 1MB/min up to a distance of 100 miles? If that's not possible, what's the farthest distance to which I can transmit the data.
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0answers
64 views

RS485 PCB Design

I'm currently in the process of designing PCBs for my project. There's going to be one larger control board, and 10 daughter boards. The daughter boards will measure the current/voltage of some ...
1
vote
1answer
96 views

Designing a PCB with multiple supply voltages

I'm in a process of designing a 2 layer PCB for my device. The device is a master control board, and there will be 10 daughter boards. Various peripherals and things will be connected there: I need ...
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0answers
25 views

Best method to determine current in ESR meter

I've recently found the need for a ESR meter(My daughter and her boyfriend brought me 8 broken LED/LCD TVs and 6 have power problems). I also decided to go all out and build a full blown ESR meter. ...
2
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4answers
122 views

Looking for feedback on my microcontroller-controlled boost converter

Title is pretty self-explanatory. Here's a boost converter I've layed out: Instead of being driven by a chip, to save cost, I'm driving it from a micro. This micro has nearly no other tasks (some ...
1
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2answers
141 views

What expression can I use in matlab to remove the negative component of a sine wave so it can look like the picture below?

The image shows a sine wave is obtained using MATLAB. I would like to know what they possibly multiplied or what expression could one use in MATLABto get this wave instead of a complete sine wave.
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0answers
50 views

Transformer/Inductor Bobbin Sizes

I have to design a 150 Ampere, 1.5 mH Inductor for a power supply project assigned to me, and off-the-shelf components are to be used. My instructor is insistent on using a transformer Bobbin to wind ...
4
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2answers
103 views

1960's video showing early computer design & simulation of a low-pass filter circuit?

I ran across this IBM computer aided design and simulation software demonstration from the 1960's in the video The Incredible Machine (1968) The gain vs frequency plot shows what looks like the ...
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0answers
48 views

Problem with driving inductive loads with inverter

Newbie here. I've got this old line interactive type UPS which cannot drive any inductive load. I suspect the issue is with inverter side of the cct as there is no issue when the commercial supply is ...
22
votes
5answers
3k views

How are circuits which use complex ICs normally simulated?

I understand that it is common practice in electronic design to simulate a circuit in some spice program before building it. Sometimes a project requires the use of complex ICs, for instance an IC ...
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0answers
40 views

IoT wireless solenoid circuit

I am a Newbie and I do not have a lot of expirience. The circuit has been put together from pieces I have found on the internet. My goal is to develop a reliable wireless solenoid circuit to water my ...
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2answers
180 views

Amplifier Design Project

I need help with starting on the design of amplifier design project, given the following listed below specifications. To be more precise, having learned about the different BJT amplifiers, such as ...
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1answer
55 views

Improve 134.2kHz PIT tag RFID reader range

I need to scan 134.2kHz PIT FDX tags from a range of 5cm to 10cm. So far, I have built custom reading circuit. It has the standard R+L+C in series driven by 134.2 kHz square wave and the output is ...
0
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0answers
39 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 ...
0
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3answers
107 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 ...
0
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1answer
37 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 ...
1
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0answers
56 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 ...
-1
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2answers
111 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 ...
0
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1answer
51 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 ...
1
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1answer
58 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 ...
1
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3answers
178 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 ...
1
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1answer
45 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
53 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 ...
-1
votes
1answer
96 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 ...
3
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0answers
87 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
83 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 ...
0
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0answers
17 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 ?
1
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1answer
93 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 ...
0
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1answer
30 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 ...
0
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2answers
105 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 ...
0
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1answer
37 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 ...
0
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1answer
30 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
65 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 ...
0
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3answers
87 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 ...
0
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1answer
43 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 (...
1
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4answers
157 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 ...
1
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2answers
167 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 ...
0
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2answers
124 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 ...
1
vote
1answer
47 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 ...
0
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0answers
61 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.
6
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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 ...
0
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1answer
62 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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votes
3answers
258 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 , ...
4
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2answers
171 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
96 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 ...
1
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3answers
79 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 ...
6
votes
2answers
213 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 ...
0
votes
1answer
93 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 ...