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1 vote
1 answer
48 views

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 ...
0 votes
0 answers
61 views

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 ...
0 votes
1 answer
185 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
5 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 ...
6 votes
2 answers
1k 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 ...
3 votes
2 answers
4k views

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 ...
0 votes
1 answer
758 views

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. ...
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 ...
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 ...
0 votes
3 answers
106 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 ...
0 votes
2 answers
115 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 ...
1 vote
0 answers
140 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 ...
1 vote
0 answers
71 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 ...
0 votes
1 answer
76 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 ...
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 votes
1 answer
297 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?
2 votes
3 answers
1k views

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 ...
2 votes
2 answers
254 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 ...
5 votes
1 answer
324 views

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 ...
0 votes
0 answers
53 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: ...
0 votes
0 answers
83 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 ...
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 ...
2 votes
1 answer
94 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, ...
0 votes
0 answers
46 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 ...
0 votes
1 answer
98 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 ...
0 votes
2 answers
317 views

PCB Review - LM5164

What you guys think about my LM5164 power board? Tried to copy the demo board version, 15-100Vin - 12Vout@1A.
0 votes
1 answer
112 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 ...
6 votes
4 answers
3k views

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 ...
0 votes
0 answers
43 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 ...
0 votes
1 answer
63 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 ...
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 ...
0 votes
3 answers
675 views

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 ...
1 vote
0 answers
79 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 ...
4 votes
3 answers
442 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 ...
0 votes
1 answer
3k views

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 ...
0 votes
2 answers
178 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 ...
1 vote
1 answer
886 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 ...
1 vote
2 answers
103 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 ...
1 vote
0 answers
102 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 ...
2 votes
1 answer
661 views

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 (...
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 ...
0 votes
1 answer
150 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 ...
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'...
0 votes
1 answer
286 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 (...
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 ...
0 votes
2 answers
868 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
168 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 ...
2 votes
2 answers
1k 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 ...
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 ...
0 votes
2 answers
334 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 ...