Questions tagged [design]
The process of creating electronic products, including components and end-user devices.
1,180
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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 ...
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4
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117
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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 ...
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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 ...
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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 ...
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1
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129
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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:
...
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3
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70
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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) ?
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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'?
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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 ...
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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 ...
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1
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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?
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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 ...
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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 ...
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2
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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 ...
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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 ...
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Is it possible to send a custom message between two USB PD controllers?
I have sink and source devices with TPS65988s on them. I'm curious about sending custom messages over the CC pins. Is it possible to send a custom message from the sink PD controller to the source PD ...
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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.) ...
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Enabling two different chargers with opposite enable line polarity
Premise:
We have 2 potential chargers:
https://www.meanwellusa.com/webapp/product/search.aspx?prod=NPP-1700 (NPP-1700-48)
https://www.meanwellusa.com/productPdf.aspx?i=28 (PB-1000-48).
The chargers ...
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3
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354
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Recommended Design to Schematics [closed]
I'm designing an MCU-based electronic device and have a BOM of the major components (power regulators, MCU, serial communication ICs, etc.).
Is there any piece of software out there that can convert ...
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1
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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 ...
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2
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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 ...
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118
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How to combine these circuits?
I'm going to make an Emergency Braking System for my high school project except there is no brakes in the model car for the sake of simplicity, the circuit will just turn the motor off.
The circuit ...
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Need to build a counter circuit using D-type flip flops [closed]
I can only learn by examples it seems. I feel I've understood my classes well... but I cannot for the life of me decide where to begin, or link my understanding to anything practical right now.
I need ...
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Proteus Simulation Error With 555 and HCSR04
Hello internet, I stuck at some point while simulating my circuit. This is a circuit that will measure distance and display it on seven segment displays. Firstly, When I tried to simulate this circuit ...
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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'...
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Is this amplifier correctly made?
This is a returning question from a while back (Design a power amplifier)
So, in general thanks to help from this site I managed to get to this point and I am very thankful, but now I have to examine ...
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2
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Looking for RF electronics design references [closed]
I’m looking for novice-level references for RF design - something targeting an enthusiastic hobbyist or engineer from a different discipline, but who isn’t a proper EE/doesn’t have specific background ...
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Amplifier for modulated 2kHz rectangular signal
I want to amplify a rectangular signal coming from a microcontroller.
It goes from -3.3V to 3.3V and has frequency of 2kHz. It is modulated with a trapezoid signal, which means the modulating signal ...
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H - probe design in cylinder cavity
I give both a short description and a longer one below. Any advice on how to design two H-probes system in a cyinder is welcome and many thanks :)
Short description
Problem: I wish to disign where to ...
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Diagram for 'Relay In a Box' (RIB) water sensor
I’m trying to build a water detection sensor that will turn on a small pump to maintain a certain water level.
I found this video using an RIB21CDC but unfortunately I only have a RIBU1C.
Is there any ...
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142
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Design a power amplifier
I am required to design a power amplifier with these specifications:
...
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Best way to design a circuit for the following AND logic
I would like to implement the following logic:
Whilst the switch S1 is pressed AND there is a voltage on VOLT (this would range from 40-60V) then the output switch would be closed and output would be ...
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Layout for fuses with fuse holder
I am designing a PCB with a throughhole mounted fuse holder (ALTIUM designer).
Is there a standard way of sketching a fuse (for ex: 5HF 12-R
, laying them out with the fuse holder footprint (for ex: ...
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Mapping geometric to electric parameters for a PMSM machine
I am looking at a PMSM machine described by the following equations:
$$\frac{di_d}{dt} = \frac{\omega_e L_q}{L_d}i_q - \frac{R_s}{L_d}i_d + \frac{u_d}{L_d}$$
$$\frac{di_q}{dt} = -\frac{\omega_e (...
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Coupled line hybrid coupler parameters
I am designing a coupled line hybrid coupler as a part of of term evaluation at my university. So from my conceptual understanding here coupled line hybrid coupler implies a coupled line coupler with ...
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How to design this kind of blade antenna? How does it even work?
I've recently stumbled upon this kind of blade antenna:
And I'm wondering how does it work? The entire thing seems to be made of CNC milled / cast metal, making the radiating element and the ground ...
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Are those components mandatory?
I am building this circuit for an NFC component ST25R95 on a small PCB.
I am wondering if I can disregard the marked components on the power supply (inductors and capacitors for filtering.) These ...
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Second opinion: circuit for camping van
I am customizing a van to take on a camping trip and want to install some electrical applications. With only little experience on this topic I did my research online and drew up a schematic for the ...
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1
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Maximum capacitance on 12 V ATX PSU
I'm designing a fan controller for a PC. It will be controlling 6 fans. I want to start initially with 100 µF tantalum capacitor for each fan. Can 600 µF capacitance on the 12 V line (4-pin, 5.08 mm ...
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Dead zone in phase frequency detector (PFD)
I am working on a design of a PFD for a PLL. I came across an issue of dead zone which requires a minimum time for the switches to be on so the charge pump works the way we want (image 1.)
The ...
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553
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How to connect DisplayPort signals respectively for sink and source applications?
I am using the TPS65988 PD controller and TUSB546A-DCI for USB TYPE C with alternate mode application. I am a little bit confused about how to connect DisplayPort signals respectively.
Firstly I found ...
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3
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Are the siren tones in electronic siren system generated by waveform generator chips or just playing audio files? [closed]
The sounds of a Siren tone defined by SAE Standards are basically different ranges and speeds of frequency sweeps played through an amplifier + speaker. Then in a modern electronic siren system for ...
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5
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PCB design for air quality measurements
I want to make a simple PCB with the following components:
1x CO₂, humidity and temperature sensor - SCD40 (Qwiic) from Sparkfun
1x 1.3 inch OLED display I2C SSH1106 from AZDelivery
1x TinyS3 (ESP32-...
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How can I calculate Litz wire strands?
How can I calculate Litz wire strands?
I am trying to calculate the Litz wire strands for a LLC ferrite transformer design.
IRMS = 2.4 A
J = 4 A/mm2
For these values:
A = 0.6 mm2
D = 0.9 mm
...
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113
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SystemVerilog loop unroll query
I am trying to figure out the hardware generated for the SystemVerilog unrolled loop, where the same variable is assigned in a different iteration of the loop.
...
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4
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PCB design with buck converter evaluation
In my project I have a 15 V power supply and I have to step it down to 3.3 V and 5 V for to use with PCB components. At first I tried using an LDO, but it heated up too much, to a point where it ...
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2
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Is there any way to get 2 sided FPC with stiffener?
We need to design an FPC board that consists of components like mezzanine connectors that are centered on 2 sides, top and bottom layers. We have concerns about attaching the FPC board to the main PCB ...
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Current mirroring in diff amplifier
Hi ,
I tried to design simple current mirror (load) based differential amplifier. I was trying to make it for optimum swing limit. In the first image as you see I used an ideal current source . I was ...
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1
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ESP32 Wroom C3 to power components
Here's some background: I am using an ESP32 Wroom C3 that is powered by a 3.7 V battery using a voltage regulator to step down the voltage to 3.3 V.
My question is: should I use the 3.3 V from the ...
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2
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How to implement load supply takeover in an MCU circuit with battery backup supply?
I'm designing a circuit for my project and I want to simplify my work by using the MCU's (heltec wireless stick) integrated battery management, but I don't know if this is viable.
I need some ...
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What kind of switch to use for output power in a variable bench power supply
I am some what new to electronics. I have been designing a variable bench power supply from an ATX.
I want to add two output power switches: One to the low current low voltage variable output rail (...
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