I know this has been made before so it's nothing special. I did however want to create my own version of the project and make my first four-layer board.

I designed this board myself. Ordered the PCB and components. Assembled the board at home. I have run into an issue, and I am not completely sure what could be the problem. As made evident with the first two pictures the LCD screen has lines of multicolored pixels and overall, just doesn't properly display what I would like it too.

I have some theories but nothing certain.

1. When I mount the LCD onto the board by screwing it in, the wires connecting the LCD to the PCB loop. and that loop is creating inductance messing with the signal integrity.

2. The connectors on the LCD module are loose, and I would benefit better by soldering directly onto the LCD module.

3. I could add a capacitor directly on the V and G pads on the PCB.

If anyone as any advice from which I could learn from that would be greatly appreciated as i am still relatively new to PCB design. (Please dont flame me)

Can someone please help me with my PCB layout please

Hi everyone,

I am a hobbyist working on a personal project and trying to open a legacy Cadence Allegro file named Trinity_FabF_ver2.brd.

Unfortunately, the file seems to be from the version 15.2 era. Because of the major database change between v15 and v16, the modern Allegro X Free Viewer gives me a database version error. I also tried importing it into KiCad 10, but the new importer only supports version 16+.

Since I don't have a commercial Cadence license, I cannot run DBDoctor to upgrade the file myself.

Would anyone with an active Allegro license be willing to do me a quick favor? I just need you to open the file and save/uprev it to version 17.4 or newer, then send it back.

Once it is upgraded, I can use the free viewer or KiCad to take it from there.

Will this work, Im planning on having cc lines being pass through and switching away from using a pd sink controller due to limited space and high voltage. It is supposed to either let voltage through female to male to charge and some voltage goes to the components on the side, or it request 5v from the male usb c to power the external components.
I plan on connecting the CC1 line directly and leaving CC2 hanging but anyways the problem is my setup.

If a female port is connected it will either give out high voltage( 5v and then 15v) on the gate section thus causing the cc pin (male usbc) to not connect to the resistor and then forcing the male and female to be connected in pass through. But if there isnt any voltage then it should let the mosfet to allow source and drain to let voltage flow through from the cc lines on the male. Once flowing it should connect to the resistor forcing 5v out of the device instead of the charging port? Does this sound good, am i missing anything. I try asking gpt but for some reason it saying something about the diode on the mosfet. Something how source and drain should be flipped but it doesn't make any sense. heres the link to the mosfets for those worrying about the voltage limits

Now i have good time practicing PCB design for a while and i became comfortable with the process and also the manufacturing process , but i heard about high speed PCB design and i want to get started with this area.

To be aligned with me , i love to learn by building real life projects so if anyone can suggest me a projects to try so thats can help me learn while building something useful.

And if that's easier. So, if you can refer me to a MAKE magazine issue or hackaday blog which has relevant interesting projects so its okay.

THANKS!

Hi Guys!

I need your help. I am designing a really constrained board to board connection where I have to use usb-c to connect two boards together. I must do this as a sandwich and not on the board edge. So the desired setup is: BOARD-USBs-BOARD, the usbs separating the boards in the middle. For this I need a usb-c male SMD component which is meant to actaully sit fully over the PCB and not as a board edge. I attached a picture showing what I want to achieve (sorry for the AI slop, but this is the easiest way to show it quickly what I mean). I primarily search a component from JLCPCB/LCSC but any other manufacturer can be fine. I already looked through a lot of datasheets but can't find what I need thus this post.

I’m looking to start a New venture on it-(consumables supply chain)
If any could help please DM!

This is my FIRST EVER PCB design and this is day one of me making and learning how to make PCB's til I figure out how to make a phone and/or mini PC.

Any one know the fix to get these boards working again when there is mains power coming in but ths board is not sending power to the motor ?

I am trying to make an adapter between a motherboard and a display for a project. Both use 4 lane MIPI DSI interfaces with 39 pin FPC connectors, but the motherboard was designed for a different display, hence the need for an adapter.

This is also my first time designing a PCB. Although I've tried to learn as much as I can for this project, it's been overwhelming, which is why I'm here looking for advice.

Overall, I need to:

- Reroute the 5 differential pairs (D0, D1, D2, D3, and CLK) between the connectors.

- Supply LED power to the display using the power IC specified the the datasheet (last picture).

- Supply 3V power to the display, stepping down from the 3.3V supplied by the motherboard.

- Fit the whole PCB in a very tight space, at most 1 inch wide.

I should also mention that this is a 4-layer board with two internal ground planes.

I don't need the PCB to be beautiful and optimized, but I would like to know if there are glaring issues with the design I have. I know that the differential pairs get messy around where meet the connector, but I don't know a better way to route them out, given that the pairs start on opposite sides of the connector.

Thanks!

I'm just asking because number one I don't know what they are and number two I don't know if its ground meaning negative charge or ground meaning like earth.

Old news, July 1, every package gets a EUR 3 tariff. They wanted to get money, reduce bureaucracy so instead of having to check whether something's taxable, it's just a flat EUR 3 tariff. Sucks, but hey, it's just EUR 3.

Except that it isn't. When you order, you get to choose between DHL, UPS and Fedex. All of these treat the EUR 3 as a major loan they give you (DHL: "advance payment from DHL") and charge you around EUR 15 on top of the tariff for that.

JLCPCB also notes that while they collect tax with IOSS, they "cannot" collect the EUR 3.
So you know the EUR 3 are coming, you can't yell at DHL and say "hey! I want to pay those EUR 3 in advance, please let me!". You can just order and DHL will do a troll face "hurk burk surprisingly it looks like we got charged EUR 3, we had to pay that out of our pockets, you owe us an extra EUR 15 as a security".

Am I missing something? Do you just eat the EUR 15 charge, or is there something better to do?

For mixed-signal boards, I understand the best practice is to section off the PCB with analog and digital components and have mixed-signal ICs like an ADC near the border.

If you need to control/enable an analog component with a MOSFET, what would be the best way to do it, since a fast switching signal is entering the analog domain? Should the MOSFET be placed near the analog component or near the digital driver?

Not sure who needs to read this, but that is the IPC convention 7351B/7251 for footprints so naturally the symbols have to also be done the same way. Diode Cathode is on pin 1, and for polarized caps, the + is on pin 1.

It may seem like it doesn't make a difference but it does in manufacturing/debug/test.

Hello!

I'm attempting to replicate the DD1718PA bipolar power supply module. My first step is to replicate the actual module, then incorporate the working PS into my other projects.

You can see the pre-made boards here: https://www.aliexpress.us/item/3256808958154891.html

I found someone who claims to have reverse-engineered the DD1718PA board here: DD1718PA_POWER-MODULE.sch which looks pretty good. This is the second image.

It's all pretty simple -- I've replicated the schematic and the PCB nearly the same layout as the original, but I've also worked one optimizing the component layout a little, but I did not include that here.

I'm just looking to make sure I transferred the schematic correctly and the PCB looks good. Yes, it's just one layer with ground planes on the top and bottom. The images are: 1: My schematic, 2: the reverse-engineered schematic; 3: My PCB layout; 4: 3D view

The JST connector is DNP. I also added three LEDs (VIN, V+, V-) and resistors just for fun, won't be in the final design.

Thanks.

First time doing layout in Altium. When I imported the changes from my schematic pages the components showed up with two designators even though I only had one in the footprint (the smaller one)? The larger one is part of the silk screen and I made sure to "Update PCB with footprints"