Questions tagged [review]
The review tag has no usage guidance.
66
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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
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5
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1
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250
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Microcontroller output override another signal, protect uC when powered off
I have a digital signal from somewhere else and a microcontroller. The microctontroller can set it's output pins to be high, low, or high-Z. If the uC pin is high or low, I'd like the output to match ...
CommunityBot
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3
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583
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7 Segment display driver
I came up with the circuit below to drive a single 7-segment display from an Arduino via a shift register (74LS595). Is the circuit correct/good enough or am I perhaps missing something critical in ...
4
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1
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281
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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 ...
CommunityBot
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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 ...
- 5,149
4
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3
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278
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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
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Could someone review my simple flyback driver please?
First of, Im very new to this. I was just designing my own flyback driver and I was wondering if anyone could maybe very quickly review my circuit. More specifically the wiring of the Fod3180 ...
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Review of PCB design L298n
I'm decided to finally make my motor driver boards but I'd be happy to have some feedback as it's my first PCB design.
It's mostly based on the datasheet of the l298n chip. So there is nothing much ...
CommunityBot
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611
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Review of PCB design: ESP32 + two relays design review
I've completed the design of my pool timer that can turn the pump and light on/off via WiFi and would love to get my design reviewed.
At 120 V the pool light should handle 500 W. The pump is 0.5 HP. ...
CommunityBot
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993
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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 ...
CommunityBot
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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?
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Design Review: 3.3V Logic to 12V Logic (Uni-directional and Bi-directional)
I'm looking for feedback and improvements on my design below. Specific questions are at the end. I created this as an attempt to answer my own, previous question. From my feedback there, it seems like ...
CommunityBot
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Schematic review for STM32 basic development board
Could anyone look over the schematic design for this STM32 bluepill-style board and check if everything is correct? I'm unsure if I wired everything correctly or if I'm missing anything important.
...
CommunityBot
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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 ...
- 8,685
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Circuit review - 12 VDC motor speed controller (555 based)
I thought I'd post this, its a project I made for fun. I didn't order the boards yet, but I spent a decent amount of time trying to make sure this will work.
It's based on the MAX14871 motor driver ...
- 8,685
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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 ...
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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 ...
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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
2
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1
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571
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Capstone PCB for a single-phase power energy meter
I am an EE major working on my capstone project of developing a PCB for a single-phase power energy meter and I need help scrutinizing it.
I Intend to interface this circuit with my Raspberry Pi 3 (...
CommunityBot
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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 ...
- 8,685
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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 ...
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0
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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'...
- 8,685
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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 (...
- 4,978
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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 ...
- 8,685
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266
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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 ...
- 2,853
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68
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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 ...
- 957
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2
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595
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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 ...
- 8,685
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4
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2k
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555 timer frequency is way off
I'm currently designing a 555 timer to provide a 38kHz square wave to drive an IR LED as part of a beam interrupt detection system.
This beam interrupt is a part of an embedded product where we ...
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FT2232H on custom PCB not recognized by PC
I am using a FT2232H on a custom PCB and I cannot get it to be recognized either by Windows or by FT_Prog. Images of the schematic are attached. I have probed all the power pins and they read the ...
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113
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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 ...
- 30.6k
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265
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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 ...
- 131
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2
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601
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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 ...
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140
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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 ...
- 69k
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4
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1k
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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 ...
- 8,685
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3
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159
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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 ...
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3
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751
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Changing output voltage of a buck converter by electronically swapping the feedback resistors
I am going to design a circuit which is going to output some digital signals. The output stage of the circuit will have some level shifters. The level shifters will give flexibility to the user to ...
- 13.8k
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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 ...
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47
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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 ...
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2
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149
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PCB Review - LM5164
What you guys think about my LM5164 power board? Tried to copy the demo board version, 15-100Vin - 12Vout@1A.
- 426k
1
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2
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Design review for photoresistor-controlled linear regulator
I would appreciate some comments/insights/criticism on my design:
I want to turn on/off a linear regulator (MIC5504) based on the light. I have tried just using a resistor and photoresistor voltage ...
- 3,067
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0
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225
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ESP32 with JGY-371 stepper motor and L293D
I'm currently trying to make an automatic chicken coop door,
I plan to use an ESP32 with an L293D motor driver and JGY-371 geared motor 30RPM (shop link).
The door should not exceed 1kg and should ...
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Need a review on my first schematic. A 3-speed mode blowers schematics
I am currently on my own project building a blower that can be controlled using a switch with 2-3 speed mode powered by 12V Li-Ion Battery with hope this can support local health workers. However, I ...
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1
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242
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ATMEGA328P development board
I'm planning to make an ATMEGA328P development board.
I'm new to electronics. Schematic is shown in the image.
Please let me know it is correct or not, and please let me know if any changes or ...
- 66.8k
4
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3
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843
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Better Gerber Review Tools
As part of my current workflow producing a PCB layout I open my gerber files using gerbv. This allows me to switch on and off layers and check things are as they should be.
However I need to present ...
- 10.6k
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Pull-ups in a mixed voltage environment
I'm working on a circuit where a 12 VDC line is switched from a USB-powered microcontroller (U1, running at 3.3 V, specs below). I want to ensure that the switch ...
- 1,334
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107
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Circuit review: Switch/monitor 12V devices using a USB-connected microcontroller
I've designed a board to allow my desktop computer to switch external USB hard drives on and off. I don't have a huge amount of experience with circuits like this one so I'd like to get some feedback ...
- 1,334
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2
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427
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Circuit for choosing one power supply from several of them
I have a load and four different voltage sources. I want to change the voltage on the load by using four different enable signal as seen in the schematic below. Note that, all of the "Enable" signals ...
- 13.8k
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1k
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SMPS feedback circuit with voltage regulation and current limiting
i’m self learning electronics for a few months now and i choose my first project to be a bench SMPS.
Since it is my first circuit design ever i really need some clarification.
My SMPS is 2-switch ...
- 998
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913
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Controlling 12V water pump with NodeMCU – circuit design review
I'm a programmer who's recently become fascinated by electronics, specifically with microcontrollers and how I could use them for various IoT projects.
For a starting pet project, I'm planning to ...
- 11
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3
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Please can someone give their opinion on my Cat water Dispenser circuit?
I'm trying to create an automatic water pump for my dear old pussy cat (I'm using her as an excuse, really I wanted a project of some sort)
I have the following Circuit:
R1 is the water itself
S1 is ...
- 30.6k