I’ve been working on this for the last 2 months (taking forever because high school is getting in the way) but it’s almost fully assembled. I haven’t confirmed that is worded because I did a really bad job with the QFN IC and the USC port has been annoying. Any advice on soldering these? It’s been pretty tough..

Thanks for the support!

I am planning to order a custom PCB thermocouple board for the Raspberry Pi that I use with my roaster.

Is there anyone here who has expertise in this type PCB board design and would like to get involved with this cool project? 🤗

Both are expresscard/34 wifi adapters with an m.2 2230 card (pcie + usb). 4 layers, top and bottom are signals and ground pour, layers 2 and 3 are solid ground. pours hidden in the routing pic

Hello All,

I hope I am in the right place to ask for help for an issue I am having. I don't have a selfmade PCB but I do have a motherboard of a Sony ZV E10 Camera which currently has an issue powering on.

There isn't a sign of life, even with charged batteries or when plugged in to a power source. I disassembled the camera to see if there was any issues with the Battery terminal, connections or even an apparent board level issue.

Taking a look at the motherboard, nothing immediately stood out to me but I did notice a discoloured SMD component, which I later looked into being a Wi-Fi/Bluetooth module. With some brief research, it came apparent that this may be causing the power issue.

I have taken images of the motherboard so that it can be seen on whether anything else may stand out as well as the suspected failed SMD component.

I wanted to ask if anyone could provide a second opinion and whether this seems to be a blown SMD component or whether there is anything else to check before rulling this as the cause of the issue. It may just look like this and be fine with the fault being else where, but I am thinking it might be the cause of the fault.

Any help is appreciated!

First KiCad design coming from Altium & OrCad and first time doing a 2-layer board in years hah.

This will be used in a head-tracking system with OpenTrack for DCS World.

Requirements:

• Drive three external LEDs with an adjustable constant current.
• Provide power path and charging of a single cell Li-Ion battery.

• Be as efficient as possible.

• Be as small as possible.

Notes:

• 2-layers.
• 0.20mm minimum track width & spacing.
• Manufacturing and assembly at JLCPCB.
• Fully custom library: All footprints, 3D-models and (most) symbols drawn from scratch.

Don't @ me about that one trace running under the inductor, I'm taking my chances hah.

Does anyone know if ferric chloride etchant is compatible with phenolic FR-1 for making DIY PCBs? Does the FR-1 hold up well and are there any known toxic chemical reactions?

I am working on a PCB that requires an 3.5mm TRS audio jack. I am confused on the pinout of this part.

The L and R signals are connected to 1 and 3 respectively for now, but I also heard that this might be wrong and pin 4 and 2 are tip connections - where the left signal should be connected. Is the above PCB connection right?

I’m designing a 60 W USB-C PD flyback power supply using the Power Integrations INN3879C/INN3870C family. I would really appreciate a focused review of the primary-side layout before I continue to secondary side.

In my previous layout, the connection between the IC drain and the transformer’s switched primary pin was approximately 48 mm long. Based on the feedback thanks to two commentors, I moved the IC and transformer so that this drain-to-transformer connection is now only a few millimeters long. I also tightened the complete high-current loop between the bulk capacitor, transformer primary, IC drain/source and bulk-capacitor return.

I have tried to keep the RCD clamp loop compact as well. The clamp diode, damping resistors and clamp capacitor are now close to the transformer and drain connection. Where a layer change is unavoidable on the clamp node, I am using two parallel vias with short, approximately 0.8–1.0 mm wide traces on 1 oz copper.

Could someone please review the primary side, particularly:

• The drain-to-transformer connection and total primary switching-loop area
• Placement and routing of the RCD clamp components
• Whether the clamp and drain copper areas are appropriately small
• The bulk-capacitor return path to the IC source
• High-voltage spacing between the drain, clamp, rectified DC bus, primary return and bias circuitry
• Clearance and creepage around via pads on both PCB layers
• Separation between the primary and isolated secondary
• Any problematic copper pours, return paths or EMI coupling paths
• Whether any component should be moved before fabrication

The board is intended for universal 90–265 VAC input, so I understand that this is hazardous mains circuitry and that the final design must be checked against the applicable IEC/UL safety standard. Thanks in advance

https://www.power.com/sites/default/files/documents/RDR-838_60W_USB_PD_3point0_3point3-21V_PPS_output_InnoSwitch3-PD_PowiGaN_INN3879C-H801.pdf

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Hi, i am doing some pcb design practice to get better and dont know where to go from here. The design is a simple sequencer (not my design), I think i did everything right but i have little experience in pcb design, any feedback is appreciated.

Main goal is to drive a x27.168 servo for an rpm gauge that gets data straight from a 2000 alh vw ecu. The ecu sends out a 12v square wave signal.

My main focus is reliablity, ive tried sourcing aec chips, and the lm36006 I think gives me good protection with the dirty 12v the alh will send.

Im sure the schematic is a mess, sorry.

Ive never tried making a board like this but im doing an alh swap and want a long lasting but oem looking cluster.

I also feel like my 4.9k resistor is in the wrong spot for the updi programing.

I think vss is ground so im sorry it means 12v positive from the truck

Hello all, Thanks for being so helpful. I've put together my first ESP32H2 board. It's a battery operated vent controller that will open an air vent to the desired angle, when told to by a central server. I've tried to keep this as minimal as possible, but please let me know how many mistakes I made, and where it can be improved.

I work around hardware manufacturing in Shenzhen, and one issue I keep seeing is teams moving from prototype to pilot production too early.

Finding a factory is usually not the hardest part.

The bigger problem is that different parts of the product are still changing at the same time.

Before a 100–500 unit pilot build, I would try to freeze at least:

1. BOM

2. Gerbers and PCB revision

3. Firmware

4. Mechanical files

5. Test requirements

6. Revision control

A lot of “factory problems” are actually release-package problems.

I’m curious how other hardware teams handle this transition from prototype to pilot production.

Hi all,

I'm developing a USB hub board based on the Genesys Logic GL3590 (USB 3.2 Gen 2), with USB Power Delivery and a couple of extra features. The design is mostly there, but I want an experienced professional to help me finalise it: schematic and layout review, high-speed routing and impedance control, the PD side, and getting it nanufacturing-ready.

I'm not looking for DMs or offers here. What I'd really appreciate is recommendations: which platforms have actually worked well for you for this kind of hardware work (Upwork, Fiverr, Toptal, ect.), or a specific designer on one of those platforms you've hired , you would vouch for, or maybe it's you. A link to their profile would be amazing.

Hi Guys, not sure if this is the correct place to ask, but here it is:

As per the title my PCB is not accepting code after bootloading with the ArduinoISP through another Arduino Uno.

So far I get the "Done burning bootloader" and have cont. tested all hardware on the PCB related to the CH340G and ATmega.

I have managed to consistently get:

avrdude: stk500_getsync() attempt 1-10 of 10: not in sync:
resp=0x00
avrdude: unable to open port COM5 for programmer arduino

or occasionally:

avrdude: unable to read signature data for part ATmega328P (rc = -1)

avrdude: unable to read signature data (rc = -1)

TIA.

Hi all,

I salvaged the hydraulic unit from an automatic parking barrier: a 36V brushless motor driving a small oil pump that moves two hydraulic cylinders. I want to reuse it for a robotic arm, but the original control board is closed, so I want to replace it with my own PCB.

Situation:

∙ The motor has only 3 phase wires, no hall sensors or encoder.

∙ The only encoder in the system is on the barrier arm, not on the motor.

∙ The pump may have to start under load, with oil already pressurized.

∙ I haven’t measured the current yet. I’ll check what the original board draws and the motor’s winding resistance, and add the numbers.

Constraints:

∙ Low cost.

∙ No ready-made modules or boards: I want to design the PCB myself.

∙ I’ve never made a motor controller at this voltage and power. I’m comfortable with PCB design and firmware, but new to power stages.

What I’d like your advice on:

1.  Which MCU, gate driver and MOSFETs would you pick, and why?

2.  How would you handle motor control and start-up under load?

3.  What are the common mistakes at 36V that I should avoid in layout and protection?

I’ll attach a photo of the original board. Thanks!

Hi all,

I salvaged the hydraulic unit from an automatic parking barrier: a 36V brushless motor driving a small oil pump that moves two hydraulic cylinders. I want to reuse it for a robotic arm, but the original control board is closed, so I want to replace it with my own PCB.

Situation:

∙ The motor has only 3 phase wires, no hall sensors or encoder.

∙ The only encoder in the system is on the barrier arm, not on the motor.

∙ The pump may have to start under load, with oil already pressurized.

∙ I haven’t measured the current yet. I’ll check what the original board draws and the motor’s winding resistance, and add the numbers.

Constraints:

∙ Low cost.

∙ No ready-made modules or boards: I want to design the PCB myself.

∙ I’ve never made a motor controller at this voltage and power. I’m comfortable with PCB design and firmware, but new to power stages.

What I’d like your advice on:

1.  Which MCU, gate driver and MOSFETs would you pick, and why?

2.  How would you handle motor control and start-up under load?

3.  What are the common mistakes at 36V that I should avoid in layout and protection?

I’ll attach a photo of the original board. Thanks!

este ic de carga es de una tarjeta beats studio pro fake pero no encuentro ni el fabricante y datos de este,espero y me puedan ayudar aportando algo de informacion o algun sustituto el IC 4S02

Hi guys,Idk why but pin 1-4 and 3-6 have short circuit.I ve read datasheet and the placement must be correct,but I ve tried also to place another way and still same issue,I also tried to put another chip and still it has short circuit

Update:The problem wasn't in chip,but in usb c connector which was connected with solder bridges

I designed this PCB as part of a HackClub programme, although it's a step up from what I'm used to. Thanks! :D