Questions tagged [design]

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

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1answer
33 views

How to Measure differential conductance dI/dV experimentally?

Numerical derivation of IV curve is always a possibility to deduce dI/dV graph. How to measure it directly in voltage bias mode? What concept is required for it? What instrument are required to ...
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1answer
42 views

Electrical installation diversification

I have an exam in three hours and there seems to be a recurring question in all previous years questions: Why are cooker units diversified while air conditioners are not? I've searched a lot but ...
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1answer
28 views

How to route current for ATE?

I have many test points on a board, a small DAQ, and an SMU that I can program with LabView. Depending on the test, I need to change which test point the SMU is sending/measuring voltage or current. ...
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0answers
73 views

Switch to use in high g-force environment?

I need an on/off type switch (spst) on a device that will be subject to high, continuous centrifugal force loads (500-1000G or 5000-10000 m/s2)). Will your everyday, off-the-shelf switch handle this? ...
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1answer
135 views

Multi channel Mosfet driver ghosting between channels (with suggested fix)

I´m pretty new to the forum (as you will see by my limited electronics knowledge) and I have a wierd problem when trying to control some automotive fans at variable speed. The fans each have an ...
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3answers
83 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 ...
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1answer
33 views

LCD Gasket Causes Touchscreen Issues

I'm having an issue with a touchscreen LCD assembly. The touchscreen normally works fine, but if I mount it in a housing with a gasket the taps sometimes register in the wrong location. The ...
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1answer
49 views

Differential pair using vias Altium

Para los que no saben ver imágenes How can I make one track of the differential pair jump to the bottom layer while the other track stays in top layer ? Currently I only know that when using ...
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0answers
31 views

Learning designing a Arduino pcb, doubt about USB traces

what consideration should I have for the USB section. How do correctly the usb traces? What means this curves? This is my reference schematic and due board. Thanks
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0answers
62 views

Custom LCD display design considerations

I'm in the early stages of designing a device that will have a custom, backlit LCD display and an injection molded case. I've never worked with a custom LCD display, and have not yet spoken with any ...
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0answers
13 views

HFSS SAR anlysis Calculation

I am calculating The SAR anlysis on a human head of a wearable antenna that i have made . I have added a waveguide port and after simulation it does not show the radiation pattern using the HFSS ...
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2answers
58 views

How to design asynchronous LIFO?

Is it possible to design asynchronous LIFO ( i.e. LIFO with different READ and WRITE clock) In FIFO , we need to change the write address pointer only on wr_clk while in LIFO we need to change the ...
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0answers
57 views

How to design a 3GHz antenna? [closed]

I would like to design a 3GHz high gain antenna. S11 has to be below -10dB and the gain to be above 9dBi - and I want to make it smaller than 8cm. What kind of antenna is better to satisfy the ...
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2answers
438 views

Biasing a second stage amplifier

I built a two-stage amplifier as shown below. I have already built the first satge (R1-R5 & C1-C2) such that If I apply a signal of 1volts peak-peak, the output (at collector of Q1) would be 8 ...
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0answers
50 views

Suggestions for improvement of a water heating control system

I have improved my heating controls circuit design and would like some feedback on how to prevent the operator from temporarily energizing the circuit when a coil is de-energized because of a loose ...
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2answers
91 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
49 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
83 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 ...
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1answer
108 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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1answer
33 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
127 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 ...
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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
70 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
65 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 ...
23
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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
46 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
195 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
58 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 ...
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1answer
83 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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3answers
137 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
41 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
57 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
125 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
56 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
104 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
203 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
46 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
57 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
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1answer
106 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
111 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 ...
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0answers
23 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
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 ...
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2answers
121 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
42 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
34 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 ...
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0answers
69 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 ...