Questions tagged [design]
The process of creating electronic products, including components and end-user devices.
922
questions
2
votes
1answer
32 views
Help needed to select proper electric motor for constant drive
I need about 180 degree movement, back and forth in about one second. Maximum torque is about 2.2 kg ⋅ cm.
I have tried RC-servos (up to 20 kg ⋅ cm), but they all burn within first 12h (maximum drive ...
7
votes
5answers
230 views
Way to determine order of cards plugged into controller board
REVISED: I have a master controller PCB with four bus bars (+, -, and two signal lines), see image below. I have module PCBs A-C (or could be 10 or 15 of them), each with MCUs and unique identifiers, ...
2
votes
2answers
54 views
Best way to switch between multiple power rails based on whether they're present or not [duplicate]
I've come across this issue multiple times already and never really figured out the best way to do it.
I'm designing a controller PCB for a drone and I would like to have a few different ways of ...
1
vote
4answers
386 views
How do thermal tapes transfer heat despite their low thermal conductivity?
I found myself needing to attach small heatsinks to Mosfets and CC power regulators. Also some high-power diodes.
Today I have learnt that thermal compounds, even best in the market, are dozens of ...
0
votes
0answers
27 views
Design Bootstrap Follower
I got confused in the emitter follower circuit with tracking feedback (bootstrap). The mechanism of operation is understandable, but how do I choose the resistor values correctly and optimally?
For ...
0
votes
1answer
34 views
PoE Design for Camera Interface Isolation Question
We are designing a PoE design to power our camera. The block diagram below is the basic design we are planning to implement.
I want to get some advice to make sure we will not be damaging our camera ...
1
vote
1answer
59 views
Decreasing manufacturing variance in analogue designs
I'm designing some modular sensors for my company's internal testing. Most are analogue, with a sensor (PT100, current shunt, pressure transducer etc), some interfacing (REF200 based PT100 circuit for ...
0
votes
1answer
36 views
Identification of antenna parameters for calculation
Sorry if my question may seem simple, but I discover the plans of an antenna (RECTANGULAR COIL WITH MULTILAYER) and I can not identify b and h on this given schema,
...
0
votes
1answer
28 views
Li-ion custom protection circuit module (PCM) design and de-rating
I am designing a custom PCM (protection circuit module) for Li-ion cells provided by a supplier ( they offer PCMs but they do not meet our RF immunity spec ). The supplier-provided PCMs have a charge /...
2
votes
1answer
49 views
Using PCB coil for proximity sensing
I'm trying to design a speed trap for an airsoft BBs. My original idea was to use IR photosensor. But this solution is prone to fail if dirty.
I'm playing with the idea to use a coil on a PCB with ...
-1
votes
1answer
56 views
VHDL simulation 'X' output (Vivado)
I'm trying to build a modulo-4 counter using dataflow modeling. I devised the logic circuit like the following;
simulate this circuit – Schematic created using CircuitLab
I wanted to implement ...
1
vote
2answers
88 views
Electrical schematic symbol help(looks like an or gate)
I'm wondering if that little dot represents anything?
3
votes
2answers
150 views
Transistor design with beta variation
I am studying Schilling-Belove Electronic Circuits, 3rd Ed. where in its second chapter under the "Maximum Symmetrical Swing" section it gives an example where the base current is kept constant and ...
0
votes
0answers
67 views
What is the function of CLKREQ and PEWAKE when those are used in PCIE?
I could understand The CLKREQ# signal is used by the L1 PM Substates mechanism. And PEWAKE signal is used to wake up the ROOT COMPLEX(RC) during the sleep mode. And these two signals are bidirectional ...
21
votes
6answers
2k views
How do you structure large embedded projects? [closed]
Background:
Junior R&D electronics engineer (the only EE in the company) -
the hardware and the coding is not the problem. My biggest issue is getting a proper overview of the project, and where ...
0
votes
1answer
38 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 ...
0
votes
1answer
47 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 ...
1
vote
1answer
31 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.
...
0
votes
0answers
77 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? ...
0
votes
1answer
139 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 ...
2
votes
3answers
93 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 ...
0
votes
1answer
58 views
LCD Gasket Causes Touchscreen Issues
Edit: Pretty much all conjectures in my question have been proved to be incorrect. I started fresh with a new approach. New question is here.
Original question:
I'm having an issue with a ...
-5
votes
1answer
65 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 ...
0
votes
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
0
votes
0answers
63 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 ...
1
vote
0answers
17 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 ...
0
votes
2answers
74 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 ...
2
votes
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 ...
1
vote
2answers
456 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 ...
0
votes
0answers
53 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 ...
0
votes
2answers
96 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?
-1
votes
1answer
53 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.
0
votes
0answers
93 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
119 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 ...
0
votes
1answer
36 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
votes
4answers
136 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
vote
2answers
143 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.
1
vote
0answers
97 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
votes
2answers
107 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 ...
0
votes
0answers
82 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 ...
24
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 ...
1
vote
0answers
48 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 ...
1
vote
2answers
198 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 ...
0
votes
1answer
66 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
votes
1answer
143 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
votes
3answers
176 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
votes
1answer
46 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
vote
0answers
63 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
votes
2answers
132 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
votes
1answer
60 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 ...
