Questions tagged [design]
The process of creating electronic products, including components and end-user devices.
1,189
questions
0
votes
2
answers
252
views
How to modify existing circuit to additionally control it from outside by raspberry?
I found a great circuit for light home automation: circuitdb.com, but I would like it to be more than a momentary light switch bricked up in the wall.I would like to control it by raspberry or arduino....
- 1
0
votes
1
answer
303
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 weird problem when trying to control some automotive fans at variable speeds.
The fans each have an ...
CommunityBot
- 1
107
votes
6
answers
82k
views
Ceramic caps vs electrolytic. What are the tangible differences in use?
A quick google around and all I seem to be able to find are people talking about the physics & the chemistry of the capacitors but not how this affects choosing which to use.
Avoiding talking ...
- 101
1
vote
1
answer
38
views
How to compare these parameters through a cost function?
I am comparing three filter designs based on different criteria. Basically my question is about what is like the best way to compute like a number, or figure of merit to evaluate this criteria.
...
- 22.2k
1
vote
0
answers
36
views
How do programmable DC electronic loads achieve a fast response time? [closed]
My understanding of programmable DC electronic loads is that they typically have a topology similar to the following:
simulate this circuit – Schematic created using CircuitLab
Large power ...
- 10.4k
1
vote
5
answers
181
views
Sallen-Key LP design algorithm
I am facing this design from Analog Devices:
Image source: Analog Devices - Mini Tutorial MT-222, Sallen-Key Filters
I don't understand how they reach the value for the coefficient m. I did a sanity ...
- 3,356
6
votes
2
answers
208
views
Deliyannis-Friend design: where is my mistake?
I am losing my mind over this.
I am trying to design a Deliyannis-Friend section and I am stuck in a loop and don't know what to do. These is the circuit and its equations.
Based on this I have ...
- 1,311
2
votes
0
answers
41
views
How to design a Deliyannis-Friend biquadratic section?
I have opened a question yesterday regarding a mistake I am not finding in my Deliyannis and Friend design algorithm: Deliyannis-Friend design: where is my mistake?
Although I am still trying to find ...
- 1,311
1
vote
4
answers
8k
views
Design a class AB audio amplifier
I am required to design a class AB audio amplifier to deliver 10W to an 8Ω speaker as shown, but I don't know where to start. The bandwidth is to cover the range from 20Hz to 18kHz. Input voltage is ...
6
votes
1
answer
228
views
Would this 3-phase sequence detector circuit work?
I was searching for a circuit that would detect 3 phase sequence and give dry contact output if the sequence is correct.
I have found the schematic below, from a Daikin compressor manual. I wonder if ...
28
votes
10
answers
31k
views
How do I power/wire something that is rotating constantly WITHOUT extra batteries?
So I want to make a Lazy Susan that is rotating constantly in one direction. I also want to have some other things on top such as neon signs, moving things, and etc. Problem is I want this to all run ...
1
vote
2
answers
214
views
Altium trace symmetry
I am designing a board and the traces look like this:
Is there any hotkey to make the traces be similar? I.e. the vertical lengths are uniformly varying, the distance between the diagonal tracks is ...
CommunityBot
- 1
1
vote
1
answer
471
views
Drone Thermal Imaging solution: Power Supply Module - Design Review & Load Sharing Query
I'm designing a DIY Thermal Imaging solution for my DJI Mavic Pro drone. Whilst the full design has been included for background info, this post refers to the power supply module design. The pertinent ...
CommunityBot
- 1
2
votes
1
answer
1k
views
MOSFET Sizing in Wide-Swing Current Mirror Design Exercise
TL:DR How do I know how to size transistors?
This is the same problem as this one.
Now knowing that I can change L, I know that my W/L ratio to make Von = 200 mV is roughly 6.75. Also knowing that ...
CommunityBot
- 1
3
votes
2
answers
100
views
Does TI or someone provide the component libraries for free for KiCad?
I am designing a circuit and PCB using KiCad. I would like to know whether TI or someone provides component libraries for free for Kicad or not.
- 66.8k
3
votes
2
answers
444
views
Humidity sensor connection “HIH-4000”
Why do we need a load resistor connected between the output pin and ground?
reference to a detailed description of the sensor
CommunityBot
- 1
0
votes
0
answers
21
views
Astable multivibrator GaN MOS
I'm a beginner in electronics design. I'm trying to build on LTSpice an astable multivibrator using the GaN transistors GS-065-030-2-L 650 V E-mode. The idea is to obtain an oscillating output of 24 V,...
- 2,854
0
votes
1
answer
665
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 ...
CommunityBot
- 1
0
votes
1
answer
317
views
How to connect pads to split plane (internal plane) in Altium CircuitMaker
My problem:
I use Altium CircuitMaker (Version 2.1). I am designing a four-layer PCB; two signal layers (top and bottom), and two internal layers (GND and PWR).
I do not connect anything (not any pads ...
CommunityBot
- 1
1
vote
0
answers
66
views
LTspice OTA simulation does not work
I am trying to simulate a balanced OTA with TSMC 350 nm technology in LTspice. Here is the TSMC 350 nm library for LTspice. I designed the balanced OTA topology below:
Thd output current is almost ...
- 8,685
0
votes
1
answer
40
views
Proteus 3D model not available
I want to add 3d model (step file) to a component in proteus. But I cant get 3d model option when i right click component. I'm currently in proteus 8.13 installed in windows 10.
I also tried another ...
- 11.7k
0
votes
2
answers
61
views
How do I design a cascade of op-amps in terms of high impedance?
An operational amplifier has a high-impedance input. That means that its current consumption would be really small, so, we can say it can measure voltage without affecting the circuit in terms of ...
0
votes
1
answer
66
views
Altium - via spacing within differential pair
Somehow I’ve messed up my Altium settings and I cannot for the life of my work out what’s wrong!
I have routed various differential pairs earlier this week and when changing layers the vias were ...
1
vote
1
answer
314
views
Synopsys Synthesis with underlying modules as gate libraries
I am trying to synthesize my Verilog modules into 1 top module which contains all the modules extracted into 1 top module.
With setting -hierarchy option in write_file, I get all the modules ...
CommunityBot
- 1
1
vote
4
answers
144
views
Auto on-off-on delay timer circuit
I am trying to make a circuit that pulls the output to VCC for 5 seconds, then pulls the output low for 2 seconds, then latches the output to VCC.
I was thinking about doing this with a 555 timer in a ...
- 15.7k
0
votes
1
answer
174
views
DC motor selection criteria: number of poles
I’m designing a system to measure an arbitrary motor torque curve. As an active load, I’m searching for a brushed DC motor that is able to withstand some degree of torque and speed as well as comply ...
0
votes
1
answer
383
views
PCB shunt BLDC controller current sensing
I am building an ESC. Motor: 22 V, max. current 90 A. Battery: max. current 60 A. My controller is a MIC4607.
The PWM frquency is 16 kHz, but I will try to get 20 kHz later.
As you see there is a ...
CommunityBot
- 1
0
votes
1
answer
57
views
How to estimate magnetizing inductance and core resistance of transformer based only on material properties and dimensions
Basically, I am supposed to obtain the equivalent magnetic circuit of a transformer, including the magnetizing inductance and the core resistance, based only on the core material and loss (which were ...
- 426k
1
vote
3
answers
265
views
ADC input software multiplexed between current/voltage input
Problem
I need to design an isolated analog front end to a Raspberry Pi which needs to work with either a 4-20mA or 0-10V transmitter. I've been studying existing analog input modules from major PLC ...
0
votes
0
answers
25
views
DRV8824 motor driver IC issue
We have use DRV8824 motor driver IC in our product.
We facing issue as per below,
motor not properly moved
motor jerky motion.
Please guide us
Attached schematics and layout image.
enter image ...
- 12.3k
2
votes
1
answer
143
views
BJT amplifier design
I am trying to design a BJT amplifier with the given parameters and limitations. The circuit is shown below.
Parameters:
Vcc = 15 V
RL = 20 kΩ
beta = 180
Vbe(on)= 0.6 V
Cµ = Cπ = 0
Limitations are:
...
- 66.8k
0
votes
3
answers
2k
views
Multistage amplifier design steps/process
I have a project for one of my classes and it is to design a BJT multistage amplifier. I can use any combination of NPN or PNP and any type bias that I choose, but I do have a few constraints which ...
CommunityBot
- 1
0
votes
3
answers
70
views
Digital Design - Reduction Operator
How do I build an 7-bit reduction operator (i.e. a device counts the number of 1s in the input) ?
- 1,041
1
vote
1
answer
307
views
Design a cascode amplifier using suitable topology to meet the specifications (by varying W/L ratio) . VDD is 3.3 V
CONDITIONS:
Output swing has to be at-least 80% of VDD (> 2.64 V in this case).
Power supply rails available are VDD and ground only.
Only one current source can be used in the design; IREF = 50 ...
CommunityBot
- 1
5
votes
1
answer
289
views
Why are some relays not completely sealed?
Here are some of the pictures of PCB relays I found online. One may notice there are these opening/holes on the top or bottom of the package. What are the purposes of these 'air vents'?
- 368k
0
votes
1
answer
468
views
Is it possible to make a keyboard with "Game Controller" style printed circuit boards and buttons?
For a long time I've wondered if it's possible to make a keyboard with PCBs similar to the ones used in NES controllers or just video game controllers in general. If it can be done with keyboards it'd ...
CommunityBot
- 1
-1
votes
3
answers
978
views
Why is digital transmission more efficient than analog transmission?
it is possible to send more data through a given circuit using digital rather than analog transmission
Slide says the above thing but I am not really able to grasp this. How can we send more data in ...
- 48.7k
0
votes
2
answers
99
views
Use dedicated display controller MCU or delegate to main Microcontroller?
I am currently working on the design of a handheld instrument for a specific biomedical application (from which I cannot disclose much information due to IP-related issues, sadly). I have a working ...
- 17.1k
0
votes
1
answer
184
views
BCD full adder subtraction and addition
I want to design a circuit that takes as input two decimal digits binary coded as A1…4 and subtractionB1…4 and displays their , sum or (fulldifference using a two place BCD-to-7-segment display as ...
- 2,421
0
votes
1
answer
232
views
Design a BJT amplifier to meet all the given specifications (using LTspice)
Given parameters: 1 kHz, 10 mV sine wave as excitation (Vin).
Specifications to be matched:
Input resistance (Rin) = 18 kΩ,
Current gain = 33 dB,
3 dB bandwidth = 425 kHz
We are allowed to vary R2 ...
CommunityBot
- 1
0
votes
1
answer
53
views
What's the most efficient way to add a heating effect to a smartwatch prototype?
Let's say I wanted to add the ability to warm up my wrist to a smart wristband. What component could I add to the wristband that would achieve that? Do I need to add a resistor?
1
vote
0
answers
38
views
Interfacing with LCD in Ben Eater's Video
So in 16:28 of the video where Ben Eater hooks up the LCD in his 6502 series, you can see that he interfaces with the LCD by sending the data, setting the RS/RW bits, and then essentially toggling the ...
- 11
1
vote
1
answer
35
views
Switching between two frequency BWs at the transmitter
Trying to transmit (and succeeding) in the ISM BWs at 315 and 433 MHz using a 3.3V radio transmitter IC + PCB trace antenna.
Current setup: separate boards for each one of the two ISM BWs; the antenna ...
- 1,425
5
votes
2
answers
2k
views
What is the reason for some flashlights emitting light in a square shape?
Here's an image of a flashlight that produces light in a "square" shape:
What is the purpose of this square light pattern, and why was it designed as a square as opposed to the traditional ...
- 8,685
0
votes
2
answers
65
views
Is the Qwiic connector just a standard JST?
I am using the Adafruit vl6180x and want to produce my own cables for it instead of the ones that Adafruit have on their site.
I could not find the Qwiic/STEMMA connector and pins on the web, nor ...
- 8,685
2
votes
1
answer
86
views
AMD R6000 CPU - DisplayPort dual-mode feature
In the past I have designed a platform that used an Intel Tiger Lake (Gen 11) CPU and now I have a new project that uses the AMD R6000 series.
Different from Intel, the design of the DP++ feature ...
1
vote
2
answers
315
views
Ground drone schematic and PCB review
I am creating a small ground drone and have come up with the following design:
To control the motors I use MOSFETs driven by proper drivers, while I also placed a GPS module (L80-M39) and an ...
CommunityBot
- 1
-1
votes
1
answer
78
views
digital display [closed]
I was working on a design question (this is not homework, just personal practice).
So I have a temperature sensor with a non-linear response, and ideally I would like to design a digital display ...
- 31.1k
0
votes
1
answer
61
views
Will this autoprogram circuit work with an ESP32-WROOM-2?
I am replacing another design that used an ESP32-WROWER-B with an ESP32-S3-WROOM-2.
I connected the autoprogram circuit similar to what it was on the WROWER but I am not sure if it will work and I don'...
- 25
3
votes
5
answers
1k
views
Linear PSU design problem
I am trying to develop my own PSU for learning purposes, but would also like to be able to use it once built. The requirements are as follows:
The PSU must deliver 1 A at 35 to 40 V (max.) ...
- 6,619