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4 votes
3 answers
2k views

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 ...
Fazeli24's user avatar
4 votes
1 answer
2k views

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 ...
Mustansir Godhrawala's user avatar
0 votes
3 answers
96 views

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 ...
lekto's user avatar
  • 41
0 votes
2 answers
114 views

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 ...
Loic Daigle's user avatar
19 votes
4 answers
7k views

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 ...
Loic Daigle's user avatar
1 vote
0 answers
134 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 ...
Mehmet's user avatar
  • 11
1 vote
0 answers
56 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 ...
Besi's user avatar
  • 737
0 votes
1 answer
74 views

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 ...
Analogkid's user avatar
2 votes
2 answers
212 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 ...
Mars the Limit's user avatar
0 votes
0 answers
45 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: ...
ppinha's user avatar
  • 1
0 votes
0 answers
72 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 ...
B L Λ C K's user avatar
1 vote
3 answers
70 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 ...
megvrx's user avatar
  • 19
2 votes
1 answer
85 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, ...
Leocat's user avatar
  • 25
0 votes
0 answers
43 views

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 ...
iMan Biglari's user avatar
0 votes
1 answer
92 views

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 ...
iMan Biglari's user avatar
0 votes
1 answer
108 views

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 ...
G.H.'s user avatar
  • 101
0 votes
0 answers
42 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 ...
1W0n_29's user avatar
  • 21
0 votes
1 answer
56 views

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 ...
Binder's user avatar
  • 150
0 votes
1 answer
153 views

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
Finn's user avatar
  • 13
1 vote
0 answers
68 views

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 ...
ARF's user avatar
  • 5,219
4 votes
3 answers
398 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 ...
ianlydae's user avatar
-1 votes
1 answer
259 views

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?
BuffiloBingo's user avatar
0 votes
2 answers
173 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 ...
Djowwie's user avatar
  • 11
1 vote
1 answer
577 views

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 ...
vinayak potadar's user avatar
1 vote
2 answers
100 views

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 ...
sephalon's user avatar
1 vote
0 answers
101 views

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 ...
Luis Carlos's user avatar
0 votes
1 answer
75 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 ...
daanabc's user avatar
1 vote
0 answers
94 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'...
md2300's user avatar
  • 11
0 votes
1 answer
275 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 (...
bem22's user avatar
  • 360
0 votes
1 answer
147 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 ...
Patryk Peroński's user avatar
6 votes
2 answers
971 views

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 ...
Chris Fernandez's user avatar
0 votes
0 answers
86 views

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 ...
박성재's user avatar
  • 115
0 votes
2 answers
742 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 ...
Andrew Chao's user avatar
0 votes
0 answers
149 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 ...
polemon's user avatar
  • 1,097
1 vote
1 answer
4k 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 ...
Brandon 's user avatar
0 votes
2 answers
274 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 ...
Sultanpepper's user avatar
2 votes
2 answers
978 views

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 ...
hkBattousai's user avatar
  • 14.1k
1 vote
1 answer
335 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 ...
Mat's user avatar
  • 141
2 votes
2 answers
915 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 ...
Oleg Butrimov's user avatar
0 votes
1 answer
191 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 ...
aWiseMan's user avatar
0 votes
3 answers
167 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 ...
Vinícius Negrão's user avatar
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 ...
user29946's user avatar
0 votes
1 answer
68 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 ...
Alex Turner's user avatar
0 votes
0 answers
52 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 ...
Clément Chaine's user avatar
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 ...
Chris Fernandez's user avatar
0 votes
2 answers
297 views

PCB Review - LM5164

What you guys think about my LM5164 power board? Tried to copy the demo board version, 15-100Vin - 12Vout@1A.
Marcos Vinicius's user avatar
2 votes
3 answers
1k views

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 ...
N. D. Smith's user avatar
1 vote
2 answers
98 views

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 ...
Ozbekov's user avatar
  • 323
1 vote
0 answers
285 views

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 ...
Simon Tropée's user avatar
1 vote
0 answers
45 views

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 ...
Anggito Zhafranny's user avatar