Questions tagged [review]
The review tag has no usage guidance.
87
questions
9
votes
6
answers
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Not confident about going for PCB production [closed]
I have come up with my own PCB and I now want to go for production. Though I will order very few boards in the first order, it costs me decent amount of money to get a fully assembled PCB. This PCB is ...
- 127
0
votes
2
answers
105
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Help reading schematics for design reviews [closed]
I'm reaching out to those with more experience in reading electronic schematics. As the Compliance engineer on the team, I primarily handle testing, pre-testing, and certifications. Recently, I've ...
- 554
1
vote
0
answers
42
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Request for Review: ESP32 Programmer Board Design
I have designed an ESP32 programmer board using Altium Designer and would love to get some feedback from the community.
I am sharing the schematic and PCB layout images below, as well as the .pcb and ....
- 23
1
vote
1
answer
52
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Adding a MUX to create a configurable voltage divider
I've got a circuit that consist of 16 analog inputs connected to a 16:1 MUX, itself connected to a buffering op-amp, connected to the actual analog input of a Raspberry Pi Pico.
The MUX (74HC4067) is ...
- 293
0
votes
0
answers
69
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Outdoor LED power PCB schematic review
Could someone look over my schematic and let me know if I need to change anything or if everything looks good? This PCB will be used outside (inside a waterproof cover) and will power a few LED strips ...
- 807
5
votes
3
answers
2k
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How can I design a readable and understandable schematic?
After reading all of your feedback on my flight controller schematic I posted two days ago in Model rocket flight controller schematic review, I redid the entire schematic and tried my best to make it ...
- 97
4
votes
1
answer
2k
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I'm trying to create a clock. Rate my first schematic design
Hey guys, I'm a developer trying to learn PCB design and advanced hardware design and needed a place to start. I've designed a very basic clock with a Atmel Atmega328P-AU and from checking out some ...
0
votes
3
answers
113
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Two-terminal current source review
When testing an unknown-voltage LED panel, I always connect it to a bench power supply with a series resistor, and increase the voltage until it lights up.
Because I’m not sure about the voltage and I ...
- 41
0
votes
2
answers
116
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What improvement can I make to this circuit?
I'm 14 years old and I am building a hotplate and would like some suggestions for improving the circuit to be more efficient and safer. I have already improved the 12-30V to 5V voltage regulator/DC-DC ...
- 355
19
votes
4
answers
7k
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Is my PCB design good or really bad?
I'm 14 years old and I am designing a PCB. I would like your advice on making it better or even restart it from scratch (as long as I learn something, I'm OK with it).
It is going to be for an ESP32 ...
- 355
1
vote
0
answers
147
views
ESP-32-WROOM-32EU PCB design
I have started a PCB design and I have tried to add an SHT45 sensor to my ESP32 chip board for my IoT project.
Could you check my design for any issues? I am also open to recommendations.
Is the ...
- 11
1
vote
0
answers
77
views
PCB Layout review: ESP-07 with 28BYJ-48 Stepper board
I have used the 28BYJ-48 in conjunction with an ESP8266 in some applications and I thought it would be handy to have pcb made. I want to use JLCPCB including Pick and Place.
The Kicad source code is ...
- 747
0
votes
1
answer
78
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Enabling power supply using microcontroller: schematic review
I am using two regulators in my design. They need to be enabled by a microcontroller.
The microcontroller is working at 5 V. The regualtor P/N is a TPS62160QDSGRQ1 and the microcontroller is an ...
- 2,712
2
votes
2
answers
271
views
Please review my PCB design for 6502 circuit
I recently made Ben Eater's 6502 computer on breadboards, and I wanted to clean it up a bit. I designed the PCB, but with it being so complicated and my first PCB I made, I wanted to make sure that I ...
0
votes
0
answers
57
views
LTspice induction motor model
I'm trying to simulate the dynamic model for induction motor in (alpha, beta) stator axis.
Results are not correct but I don't know how to fix this issue. How can I fix them?
Code:
...
- 1
0
votes
0
answers
88
views
Schematic Review: Interfacing ADS1299 with Seeed XAIO NRF52840 sense?
I need someone to review my schematic and guide me to fix the problems in the schematics.
Need help reviewing the schematics.
Can I power the ADS1299 with Seeed Xaio? If not, then how? I asked this ...
- 101
1
vote
3
answers
71
views
Review and Feedback on my Prototype Button Module for Breadboard [closed]
I'm working on creating a button module that can be placed on a breadboard. I've designed the schematic for it and am considering converting it into a PCB soon. You can find the images of the module ...
- 19
2
votes
1
answer
104
views
Redesign of a power supply with a 4-channel DC-DC converter
I'm currently working on a project involving a microprocessor, where I'm using a 5V input via USB. To power a microprocessor and other components, I need additional voltage inputs of 3.3V, 3.0V, 2.5V, ...
- 25
0
votes
0
answers
48
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ATMEGA32U4-AU Schematics Sanity Check
I had previously asked a few questions about ATMEGA32U2 and got great feedback. I updated my schematics and went ahead to order, only to realize that JLCPCB is currently out of ATMEGA32U2. I have ...
- 115
0
votes
1
answer
102
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ATMEGA32U2 Schematics Sanity Check
I am not certain if this is a thing, but I was hoping for some members to sanity check the below schematics I have for an ATMEGA32U2. The external LCDs the ATMEGA32 is communicating with are TTL and ...
- 115
0
votes
1
answer
113
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Project design review resources
I've spent the past week or so working on my first circuit board project, and I'm wondering what resources are available online or otherwise for reviewing and checking my design. I want to check to ...
- 101
0
votes
0
answers
45
views
Review for 4 layer PCB using ATmega328P
This is my second ever PCB. I am trying to integrate it into a preexisting 12V electronic car. The idea is to take all the inputs from the JST connectors (stop and drive are buttons, ultrasonic and ...
- 21
0
votes
1
answer
69
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Inconsistent results on digital inputs (circuit review)
I am attempting to make a prototype automated testing jig for a ESP32S3 board with a Raspberry PI 3B+.
I am getting inconsistent results when reading the digital outputs state of the ESP32S3 on the ...
- 150
0
votes
1
answer
198
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Schematic design review of a custom macropad with an ATmega32U4
This is the first time I've made a "more complex" PCB. Before I buy all the parts it would be nice if someone could check my design.
ATmega32U4: Datasheet
- 13
1
vote
0
answers
94
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Review of dual coil latching relay driver with single input
I need to drive dual coil latching relays from a single input signal. Following are my assumptions:
low-side drive of the coil
coils connected to 12V automotive
coil resistance unknown, assumed 1A ...
- 5,229
4
votes
3
answers
473
views
PCB Review / Signal Return Path
I'm trying to design better PCB layouts and as for now only work with 2 layers boards.
My question is about the signal return path on this PCB, is the design in the "right" path or I'm doing ...
- 43
-1
votes
1
answer
319
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I designed an ATmega32U4 circuit, will it work?
Here is my schematic, drawn in EasyEDA:
The battery is the Sparkfun lithium-ion battery. I based the battery charger on the official one.
Will this work, or do I need to make some changes?
0
votes
2
answers
181
views
Schematic review request - steering wheel
I'm in the process of designing and ordering my first PCB with MCU. In the past I did make PCBs that were driven by a Arduino Pro Micro chip, but I wanted some more professional.
Below I added the ...
- 11
1
vote
1
answer
1k
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RS485 communication circuit review
We are working on RS485 communication. We have designed the schematic as shown in the image. We are using TI's THVD1520 IC.
Is the logic of the circuit correct? We are concerned about the 2nd and 3rd ...
1
vote
2
answers
109
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Hot-pluggable bus design review
I am currently designing a hot-pluggable bus system where a module is connected to its respective slot via a first mate/last break spring-loaded connector. I am using PJON, in specific PJDL on the ...
- 31
1
vote
0
answers
103
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Circuit review - Constant current sink with complementary current sink and feedback control
I just made this circuit that I can't even properly name as it has unique features.
My question is if there is an easy way to do this.
Required features:
Constant current sink 10mA
Variable power ...
- 312
0
votes
1
answer
78
views
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 ...
- 1
1
vote
0
answers
95
views
5 V to 500 V converter PCB review
After spending about an hour researching, I opened EasyEDA for the first time to make a circuit. It is supposed to convert 5 V from a USB port into 500 V in order to power a neutron detection tube.
I'...
- 11
0
votes
1
answer
290
views
I2C device responds with ACK but cannot read
I have three sensors on a board. Two of the sensors are the same model and firmware with the same address (MLX90397). I used an LTC4316 to translate the address of one of the MLX90397s.
In Linux (...
- 360
0
votes
1
answer
154
views
Robot PCB review request
I am making a PCB for my robots in Altium Designer software. It is my first big PCB project and I want someone with more experience to tell me if everything is all right with my design.
I am writting ...
6
votes
2
answers
1k
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Ethernet layout review: avoid vias or avoid copper under transformer?
I am designing a PCB that needs two adjacent Ethernet ports, both at 1Gbps speed.
The first Ethernet port (J5) is broken out directly from the processor module (Raspberry Pi Compute Module 4).
The ...
- 1,418
0
votes
0
answers
87
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Does this circuit have any problems?
I built this circuit for removing DC from a signal, amplifying AC, and offset it via an op-amp for sending to an ADC.
AC signal amplitude is about 0 ~ 20 mV or 0 ~ 1 V.
The reason the signal ranges ...
- 115
0
votes
2
answers
969
views
PCB design review (ATmega32U4 keyboard PCB)
I've been working on an ATmega32U4-based PCB for a custom keyboard for a while now. I made a few prototypes with similar designs, but they all seemed to have issues with the microcontrollers dying ...
0
votes
0
answers
179
views
Replace transistor-latch with thyristor: is my circuit correct?
Please consider the following two circuits:
On the left, is a transistor-latch using a PNP and an NPN transistor.
I'd like to replace those two transistors with a thyristor, mainly to get a little ...
- 1,097
1
vote
1
answer
5k
views
Schematic review for STM32 basic development board
Could anyone look over the schematic design for this STM32 (STM32F103C8) bluepill-style board and check if everything is correct? I'm unsure if I wired everything correctly or if I'm missing anything ...
- 21
0
votes
2
answers
366
views
LiSOCl2 battery EOL monitor review
I'm working with a device which will use Lithium thionyl chloride (non-rechargeable) batteries as a backup source; their discharge curve is quite flat and AFAIK you can't tell how is the battery in ...
- 79
2
votes
2
answers
1k
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Solid state relay output connection: Is there a difference between high-side and low-side switch configurations?
I am planning to use this SSR chip.
I decided to use the "Connection C" configuration which is given pictured in the 2nd page of the datasheet.
However, there is something I don't like ...
- 14.2k
1
vote
1
answer
363
views
Design review request : Mains / low-voltage PCB design
I am creating a radiator controller by pilot wire (in France) for domestic and personal use.
The general idea is that using the 230V AC (standard) and modifying it with full, half or no wave you set ...
- 141
2
votes
2
answers
994
views
PCB design review request: ESP32 as LED strip controller
I'm trying to create my very first PCB and before wasting my money on ordering non-functional PCB, I'd like to ask your advice.
Background: I have WS2815 LED strip, controlled by ESP32 which uses two ...
0
votes
1
answer
211
views
Did I design the decoupling and power setup right?
I am building a self-playing piano project with 88 solenoids and sustain control. I use 11 daisy-chained shift-registers which are connected to an Arduino and controlled using SPI. The latch will be ...
- 35
0
votes
3
answers
168
views
Help a beginner understand if a design is correct
I'm fairly familiar with Ohm's law and I did some calculations I'd like experienced engineers to confirm if it is correct or point where I made a mistake
Here's the idea
I want to power a self-made ...
- 103
2
votes
4
answers
2k
views
PCB design review (ATMEGA32U4)
I have been trying to make a watch for the past few months, but all my prototypes have been unsuccessful.
So, to try ironing out some problems, I made a practice PCB to try testing my base Atmega32u4 ...
- 33
0
votes
1
answer
70
views
Inverting SMPS - tantalum and part selection | Monolithic controller getting hot
I'm designing a circuit to provide a negative voltage rail in a battery for an ADC. I've decided to use a particular monolithic BCD Chip that can work as a step up/down/inverting controller and has an ...
- 315
0
votes
0
answers
55
views
Connector pinout review
I am designing a system around a bus using DIN 41612 connectors. I have come up with the following pinout for my connector taking into account the following requirements :
Each signal pin should have ...
1
vote
1
answer
2k
views
Schematic review: STM32 Bluetooth antenna
I am working on a device based on the STM32WB55xx line of microcontrollers.
In the latest revision of the PCB, I altered the antenna filter and chip antenna components to better match the device ...
- 1,418