Questions tagged [design]
The process of creating electronic products, including components and end-user devices.
1,117
questions
2
votes
1answer
60 views
Parallel connection of V7805-2000
I am using V7805-2000 in my design. V7805-2000 is capable of producing 5V @ of 2A. Can I connect two V7805-2000 in parallel to get 4A?. In this datasheet it is mentioned as "No parallel ...
1
vote
3answers
193 views
Do hardware design engineers design circuits from scratch? [closed]
I'm new to hardware prototyping and circuit design. Where do ardware engineers look for reliable circuits that would work for the first time of prototype?
I know this is a general question. I'm ...
2
votes
1answer
70 views
Sizing a divider network for a buck regulator
I am (re-)designing a buck regulator circuit, after having done the calculations the first time according to the manufacturer's datasheet.
My problem is that I should be seeing 3.3 V on the output, ...
1
vote
0answers
63 views
Designing BJT that's beta value is 120
I want to design a BJT that's beta value is 120
Following this picture can I say that the components of the base current are like this?
J(B) = J(pE) + J(R) + J(RB) - J(G) - J(pC0)
I want to design ...
0
votes
0answers
56 views
SMPS power supply - fuse resistor calculation
I'm designing a TNY288-based SMPS. My transformer input inductance is 931μH. I'm using a 320V MOV and have a doubt about the fusible resistor calculation.
The output load is 12W, the input capacitor ...
0
votes
0answers
14 views
Help with open supply diagnostics on SENT output with Micronas HAR3735
I'm trying to develop a way to diagnose an open supply pin on my sensor board using only the SENT pin from the sensor board in the attached schematic. The circuit would be placed on the sensor board ...
1
vote
0answers
73 views
I am trying to design a basic CMOS Image sensor
I am new to electronics so I might be doing some bad mistakes on my design but anyways,
I'm trying to build a CMOS Image sensor using Proteus, and I couldn't find some basic tutorial to follow, Yet I ...
1
vote
2answers
44 views
Design of feed gap of a dipole antenna
I am unsure of the formula used to calculate the feeding gap of a dipole antenna. When I go through some research papers, the formula given to calculate the feed gap of a dipole antenna is L/200. I ...
0
votes
1answer
51 views
Improve conceptual intervalometer for rotating potted plants
I'm trying to avoid having my plants tilting or otherwise looking bad after only getting sunlight from one direction. To solve it, I want to make the pots rotate.
I'm trying to design a cheap, stand ...
0
votes
2answers
44 views
How do I size conductors to a three-phase induction motor to account for voltage drop?
Suppose I have a 480-volt nominal electrical distribution system, and a 460-volt nominal motor. Assuming +-5% variation in the source, it could get down to 456 VAC. I've seen references to motors ...
0
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0answers
51 views
Is it viable to short pitch different windings by different degrees of short pitching in the same synchronous generator?
In the design of a synchronous generator one can chose to eliminate or reduce harmonics at the expense of emf.
The pitch factor \$K_p = \cos(\alpha/2)\$, which is always less than or equal to 1, ...
-2
votes
3answers
321 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 ...
0
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3answers
108 views
Heatsink needed to keep my resistor from damaging due to heat
I am looking to find an appropriate range of heatsink selections to maintain my resistor from damage due to heat. I am using a flat plate (SS) resistor from ARCOL (TFBR900). It is rated for a 900 ...
0
votes
1answer
103 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 ...
0
votes
0answers
91 views
Is this design correct? How can I improve it?
I designed this circuit to control a total of 4 motors via a web interface hosted on the ESP32.
The bridge is simply a 0 ohm resistor needed to activate the motor driver.
The L80-M39 is an integrated ...
1
vote
0answers
106 views
Designing a push-pull amplifier
The exercise is to calculate \$ R_1\$, \$ R_2\$ and the gain for small signs of the following circuit, which is supposed to be a audio amplifier:
And I have the following information:
\$ R_L = 8\...
1
vote
3answers
143 views
STM32 PCB design
I am going to use STM32F407VG in my PCB design. I have never done it so that I don't know how to do it.
It's my first time using STM32 so I don't know how to design external capacitor and crystal. I ...
0
votes
0answers
42 views
Regulate higher voltage for mcu and tracking pre-regulator
I am currently designing a lab bench power supply using the LT3080. It will have an input of 18V and an output of 0-15V and 1A. I am going to use an Atmega328 to control the limits and a display. For ...
0
votes
0answers
48 views
Detect Ethernet cable connection
I would like to know if it possible to detect the connection of an ethernet cable when it is connected to my PCB. Ideally I would like to implement a circuit that signals to my SOM that the ethernet ...
0
votes
1answer
82 views
design an embedded system with ac6905a bluetooth IC [closed]
I am a beginner in designing electronic boards and PCBs. I want to design a board, somehow, this board should be able to receive surround sound through a microphone and send it via a Bluetooth IC. The ...
0
votes
1answer
151 views
How to calculate the Vout/Vin in this circuit? And how to write this circuit in a simulator like PSPICE? (buffer)
This question is about this circuit, a signal conditioning circuit.
I am trying to the discover the Vout/Vin, I think it is one but I can't demonstrate it. I can't figure out why these resistors and ...
0
votes
2answers
52 views
Protection circuit module for not only “deep” discharge protection
I have to ask about protection circuit module, like BQ297xx, AP9211, AP9101 etc.
As I see, protection circuit module is used to protect li-ion cell from deep discharge - so if the li-ion cell has, for ...
9
votes
3answers
2k views
What is this style of PCB called? It's single-sided, with lots of orthogonal jumpers and strange "horns"
A hobby of mine is to take apart discarded electronics -- to see what I can learn. Sometimes, I'm just puzzled.
I've seen this style in name-brand stuff, meaning high quantity, like radios and vcr's. ...
0
votes
0answers
29 views
Optimizing Coaxial Feed Location on Circular Patch Antenna
I am designing a circular patch antenna in FEKO and I want to optimize the feed location such that the impedance is matched to 50 Ohms. I wanted to ask if there was a rule of thumb or equation that ...
0
votes
1answer
45 views
Can't set clock network delay to zero during synthesis
I am using Synopsys Design Compiler for synthesizing my design. I have read in the User's guide of DC that by default it assumes ideal clocking during synthesis meaning that clocks have zero network ...
0
votes
2answers
98 views
Is there a design tool that tells you what gauge of wire to use? [closed]
Do any circuitry design tools (5spice, etc.) have a feature that tells you what currents you'll have in each wire/cable, and recommend therefore which gauge of wire or type of cable to use for each ...
2
votes
2answers
163 views
Will a transformer work without two separate cylinders?
A transformer has two inductors. When one of the inductors is fed AC, a changing magnetic field is produced. This is because the magnetic flux can penetrate through the transformer core and induce a ...
0
votes
1answer
41 views
Need guidance on battery selection for small wearable device
I need help in understanding the factors that affect my battery selection for a device. I'd like to make this generic so that it is useful for others but I will use what I am designing for examples ...
1
vote
2answers
121 views
Can anyone recommend a voltage controlled voltage source circuit?
Basically I want to have a source of 0 to 3 volts that will control the output of a different source from 0 to 100% (or close to it).
For example, if my source is 2v and I set my control to 1.5V (half ...
1
vote
2answers
127 views
What is a methodical way for designing perfboard layouts?
I'm wondering if anyone has any tips for efficiently and methodically designing perfboard layouts. I'm working under a deadline to transfer several solderless breadboard circuits to perfboards and it'...
1
vote
0answers
48 views
Multiple GNSS receivers on a tiny PCB - layout advices
I am designing a board where I want to have 2 receivers using different constellations.
Due to space constraints, I have the idea to put the two receivers on the same PCB (one on the top layer and one ...
1
vote
3answers
182 views
Calculate the cut off freqency and Q factor from Chebyshev filter transfer function
I am trying to calculate the cut off frequency (Wo) and quality factor (Q) from the transfer function I derived for a Chebyshev filter. I need these two values to further calculate the component value ...
1
vote
3answers
195 views
Tradeoffs for NTC Thermistors regarding 10K vs 100K vs 1Meg etc
I would like to make multiple strings of sensor having about 10 thermistors per string, each wired individually, but terminating at different lengths so that they're evenly spaced along each string. ...
0
votes
0answers
37 views
Can a Schottky diode act as a short under high frequency due to its capacitance at the PN junction?
I read online how a Schottky diode has a capacitance usually in the tens of picofarads. I was wondering, under maybe high frequencies this could act as a short due to the general nature of a ...
-1
votes
1answer
89 views
Which approach is mostly used to create an electronic device? [closed]
I am very new to electronics, what I know so far (which may be wrong) is that there are two approaches to create an electronic device (examples of electronic device: pocket calculator, TV remote ...
9
votes
4answers
1k views
ATmega328P reading DIP switches using the lowest possible power
I'm currently looking for some advice about making my circuit as low power consumption as much as possible.
I need to use three DIP switches in order to set the address of my ATmega328P board in a ...
-1
votes
1answer
63 views
Thunderbolt, how to get access to developer Area?
I am trying to implement Thunderbolt in my own board design. I have seen that it is possible to get the thunderbolt controller (hardware) but it is impossible to get important design information. I ...
0
votes
1answer
52 views
Altium - imperfect polygon-via connection
Altium tries to approximate circles where it doesn't need to.
I have a polygon pour with some vias inside, associated to the same net. The connection style is "direct connection" so the ...
3
votes
2answers
590 views
From sine wave to square wave
I want to make a square wave generator with an LM311.
I have a variable sine wave source from 1Hz to 16kHz. The amplitude can vary between 0.5V to 11.4V.
I tried to use the comparator circuit below ...
-4
votes
3answers
71 views
Can I convert 5v 20mA to 12v 7a [duplicate]
I want to convert the 5v 20mA power from a digital Arduino output to a strong enough power for a 12v 7a motor. I do not believe the converter (linked below) I have selected will do the full extent of ...
0
votes
1answer
54 views
How do I calculate the x & y dimensions of pin 1 for a QFN package?
I'm trying to make changes in pad location. How do I calculate the x & y location of pin 1? Is there any mathematical calculation, how do I do those calculations?
I'm sharing an image of a QFN ...
1
vote
2answers
81 views
Will this Step Up Converter solve my problem?
For a project I am doing at home, I need to convert a 5v digital output from an Arduino to a 12v digital output to power a motor. A solution I found for this is using a step up converter. The step up ...
0
votes
1answer
62 views
Creating multiple Ring oscillators and placing them through Hard macro
I am trying to place multiple ring oscillators using XDC macros. I have been able to follow the steps on the video by Xilinx on XDC macros and it worked.
However, I am facing errors and critical ...
0
votes
1answer
51 views
Which topology is best to design a DC DC 120W Power Supply? Kindly go through details
My requirement is as follows:
Input Supply 110+-30% VDC i.e., 77VDC to 138VDC.
output need to be 24VDC 5A.
All the basic protections like short circuit, Reverse polarity.
No power consumption when no ...
0
votes
1answer
84 views
How do I select the transistors for this circuit? [closed]
I have no background in electrical engineering at all, and only bought my first breadboard this week. I'm still completely new to this and just trying it out.
I'm trying do drive an 12V actuator, ...
0
votes
1answer
68 views
What is the best cable for a 3d printer wire bundle?
I am connectorizing my Ender 3's hot end through a 15-pin D-sub connector, so I can swap in an E3D hotend much more easily. I have previously done this with another printer, but I am updating my ...
0
votes
1answer
33 views
How to interchange between two cores (inside a coil) in a simple brushed motor
I am going to build a very simple brushed DC motor. The rotor will not be enclosed in a stator (the rotor will be built on a bench with free space around it), and I will using permanent magnets to ...
0
votes
1answer
67 views
Where can I find information on interfacing an MCU with an HDMI display? [closed]
I am just starting the process of creating a product that will have an HDMI display (not chosen), but I don't quite know where to start. I have never delved into the realm of Displays, and don't know ...
0
votes
0answers
40 views
8 bit divider can you help with it? [duplicate]
This is the vhdl code and it need more, can you help me?
...
1
vote
3answers
222 views
Need design best practice: microcontroller controlled, variable, DC voltage source [closed]
I need guidance on designing a Variable DC power supply with the following characteristics:
Microcontroller controlled
DC output ~ 1V - 30V
Current handling: ~5 amperes
Power handling: ~50 watts
I ...
