schematic review

Hi everyone, I am working on a wearable ECG monitoring device and would appreciate some feedback on my schematic before I proceed to the PCB layout. Project Overview: Analog Front-End: MAX30003 (Biopotential AFE). Power: The system uses the 3.3V rail from the XIAO, which is stepped down to...

Hi. I'm designing an audio equalizer and I'd really appreciate if anyone could take a look at my schematic and give me any feedback they might have. Here are images of the schematic sheets. A pdf is also attached. Links to datasheets for some of the components just in case: DMP3028LSD...

Hello, This is my first post on the forum and I'm seeking some guidance. Would anyone mind looking over my schematic for a dim bulb tester and giving me feedback? The input is coming from an isolated AC lab power supply. Relays are actually DPDT 1NO1NC and the bulbs are E27 fixtures not LEDs...

Hello everyone, I’m currently working on a project that involves controlling a small robot with 3 stepper motors using TMC2208 drivers in standalone mode. However, I’m encountering some issues that I suspect are related to my schematic design. I’ve reviewed the connections multiple times, but I...

Hi all, I am trying to add a USB-C socket on my PCB that I would like to use for data transfer only. I currently have a simple UART molex connection, but I would like to upgrade it to USB-C in my next iteration of my PCB :) I am using the FT230X to convert it to UART as I want to use DMA...

Hi everyone, I am relatively new to designing schematics and PCB's and have only ever done simple circuits up until now. I have tried my hand at designing my very first ESP32 based Dev board. I know that these can be bought for fairly cheap already, but wanted to have a go at actually designing...

Hi, I'm trying to create a little ethernet board and I seemingly can't get it to communicate with an ESP32. I'm posting in this thread first as I suspect it's due to the design rather than the ESP32 ethernet library(could be). The design is based on the W5500 as its the chip LCSC has the most...

I am using ROS-43-119+ from Mini-circuits. I need a VCO that can generate a 40MHz frequency. ROS-43-119+ can generate my required frequency by controlling the tuning voltage. I need sinewave output from the VCO. There is no mention of the output type in the datasheet. So what is the out type...

Hi I'm building a 1/48 scale DC-3 model plane and would like to add some interior LED lights and a pair of micro DC motors. This is my first circuit design so I would greatly appreciate it if someone could review my initial schematic to let me know if it is workable. Obviously once I build the...