schematic

Hello everyone, For quite some time now, the four windows of my 2006 VW Polo have not been working. After a long troubleshooting process, I came to the conclusion that it must be due to a defective circuit board in the window regulator control unit, which is located in the driver’s door. On...

For my assignment, I need to create a Proteus 8 schematic showing Arduino Uno → PCF8574(I2C backpack) → LM016L LCD connections using I2C. It wasn't too hard to implement basic LCD control (VSS/VDD/VEE/RS/RW/E/D0-D7 → P0-P2,P4-P7). In internet tutorials it typically looks like this: (SCL and...

Please help me figure out the connection in this diagram. The picture shows a fitness tracker. The question is: 1. What is the designation near the u11 chip (marked in gray)? 2. How can these three parts of the electrical circuit be connected so that there are no "flying in the air" elements...

Hey guys, I'm working on a GSM project using the SIM900A module, and yeah I <Mod: Obsecenity deleted> I totally forgot that SIM900A needs max 4.5V on the VBAT pin. So I went ahead and designed my whole circuit thinking everything is 5V powered, including SIM900A. Luckily, I had already added a...

Hello everyone, I would appreciate some assistance in reviewing my PCB project. I am developing a project using the w5500, and I used the schematic available at https://docs.wiznet.io/img/products/w5500/w5500_sch_v110_use_trans_.pdf to develop it, with some modifications. As this is my first...

This personal project is my first attempt at designing the schematic of a custom microcontroller-based circuit board. I based this design around STM32's B-L4S5I-IOT01A discovery board. However, I still have a few doubts regarding the functionality of this design, especially when it comes to the...

This is the magnetics connection in my design. This PCB circuitry has been tested and working individually, but when I connect two or more of the same PCB hardware to an ethernet switch, the subsequent hardware would not be able get physical link over ethernet, only the first one connected would...

Hello there! I am new to electronics, and I am trying to understand how this circuit works. Before it are 3 stages of Active Bandpass Amps. The whole circuit is trying to extract some AM signal from an antenna. I have already found how the Bandpass worked in the circuit, but I can't find...

I need help. It's not working—some of the transistors are getting kinda hot. I think the LEDs might be wired the wrong way, but I don’t think that’s the issue. However, it could be. It’s a 12V–24V setup. I attempted to make brakes—that’s what the third transistor group does. I think everything...

I am a beginner and I don't understand why the transistors aren't permanently on, because the current is flowing from the capacitors and from the battery to the base pin at the same time, so it should be turned on because there is a wire that connects the transistor base pin directly to the Battery

I have been recently working on a board which just breaks out a few switches and LEDs for easy soldering to a Raspberry Pi. There isn't much of a circuit, but I would like guidance if I chose suitable resistors, etc. I have two LEDs - APT2012LZGCK (2mA @ 2.65Vf - with a 330Ω res.) and an...

I am a complete beginner, but I would like to learn how to use Altium Designer. Sorry in advance for the silly questions. I have the following two circuits (pic no. 1) that I want to combine into one circuit and draw in Altium Designer schematic. I tried to draw the mentioned circuit in Altium...

Hey everyone, I reached out earlier for some feedback on my first PCB schematic, and I got some really helpful advice. Now I'm hoping those with more experience can take a look at what I've done so far. I'm also wondering if someone could check if my schematic actually works because honestly...

Hey all, I'm looking at the datasheet for the ISP_BLE_5S1057, specifically the AX variant, and when looking at the example they provide I am completely dumfounded by all the extra stuff they have on the schematic. I'm very new to the whole world of PCB design, so if someone could help I would...

Hi All, I have created a schematic, see the attached screenshot. Now I am trying to simulate how it works in a digital Spice simulator (built-in DipTrace 5.0 beta). In general, it works almost reasonably. But there are strange signal distortions on some outputs of U3 on each...

this circuit must play the role of the TVS protection diode, but it is made with active elements such as mosfet and bjt.

Hello all, I've recently completed the design of a circuit schematic and PCB for controlling an RGB LED string using a NodeMCU ESP8266 WiFi module. The circuit operates on a 12V DC input and utilizes three relays to control the red, blue, and green LEDs respectively. The LED string itself draws...

I have a Supermicro 10xDRI-t and in the ill fate it happened that I dropped it and on the way down it scraped on a screwdriver before I caught it. After inspecting the board I found 2 missing and 1 damages cap (one of the missing ones could have been a transistor). Does anybody know where can I...

I've realized that I probably have to create a custom symbol and footprint for this part, but I am unsure how to connect it in relation to the other components in my schematic. Does the power go through the charger as in I connect everything to it or to the battery?

Hello, I want to make a test circuit with led, button, potentiometer, jumper etc components to test the circuits. By connecting my circuit connectors to this board, I will test whether the relevant lines work. I need schematic and layout examples for this structure and advice to improve it.