Questions tagged [pcb]
PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.
6,112
questions
0
votes
2
answers
60
views
Why is the MOSFET in this fan control circuit overheating?
I’ve designed a fan control circuit using an N-channel MOSFET (STN3NF06L.) The fan operates at 12V, and I’ve isolated the 12V side from the 3.3V microcontroller side using an optocoupler (ACPL-W314-...
4
votes
1
answer
291
views
How to connect to "upstands" on the PCB without soldering?
I've got two items of the same model number, but one of them has a Phoenix type terminal on the PCB for the connection. See photo below.
The other one has "upstands" poking out of the PCB.
...
- 601
1
vote
1
answer
57
views
Visualizing 2 Layer PCB Return Currents
Hobbyist moving a manhattan-style prototype of an analog FM radio to a PCB for ease of assembly and access to SMT parts. I have attempted a 2 layer FR4 board with a 1.6mm thickness, as I feel that ...
- 570
0
votes
3
answers
70
views
Does anyone know what the symbol or footprint is supposed to look like for this toggle switch?
I'm trying to make a circuit diagram on Eagle and I can't find the symbol or footprint for this particular toggle switch called 5646MAB (first pic). I would custom make it myself on Eagle but I have ...
- 31
1
vote
1
answer
56
views
Circuit schema 2 ways WS2812 connect with 1 PCB layout
Hey all I am having a difficut time trying to figure out how to go about the following:
I am wanting to just make 1 pcb but I am using WS2812B LEDs and therefore needs to be in the correct direction.
...
- 797
0
votes
1
answer
46
views
Help identify this SOT-23 5 pin component labeled ADU06 and weird behavior
I'm new to fixing circuits and I'm trying to figure out why this board will not boot. I've traced the Vcc on the MCU (H8/38024) to this circuit.
I'm guessing that it is a linear regulator, but when I ...
- 1
1
vote
1
answer
102
views
USB data does not work on my PCB [closed]
I've build a PCB based on RP2040 microcontroller. A modified version of PicoDVI board - with added memory chip.
The board works fine, with just one problem - it is not being detected when plugged to a ...
- 173
0
votes
1
answer
61
views
Does DDR3 master clock need to be longest trace in general?
I'm working on my first PCB which incorporates DDR3L memory with an STM32MP157AAB3 processor. I've been following ST's DDR3 guide from AN5122 and I came across something which I found odd and which my ...
- 445
0
votes
2
answers
74
views
Treating an STM32 MCU's unused pins and reset state
I'm using this MCU from STM2 on a board and the PCB layout is as follows:
I will not use several MCU pins, so they are disconnected as shown above(pin 6, 7, 8, 11, 12 ect.). Also I cannot do any ...
- 1,470
0
votes
0
answers
32
views
Controlling a device in a car using a button and ignition
I need to connect a device to my car. I thought about using an XOR gate because:
A - button
B - car ignition.
If the car's ignition is off (0), pressing the button (1) will turn on the device (1).
If ...
- 21
0
votes
0
answers
39
views
How to short time delay controller?
I have an old keyboard which I use for decorative purpose. It has RGB lights which turns on for few seconds when a key is pressed. I want to keep them on at all times. How to achieve this? Can I ...
0
votes
0
answers
83
views
TCA9548A I2C Python coding help
I am designing a board using 4 TCA9548As that each have 8 screw terminals so that I can connect to 32 addressable devices. I am trying to create the python code to be able to write to each of these ...
- 25
0
votes
1
answer
82
views
Is the wiring of this STM32 minimal system acceptable?
This is a question about the optimal routing for an STM minimal system. I made a minimal system board using the STM32H563VIT6. Is the routing method shown in the upper section, where I aim to connect ...
- 51
1
vote
2
answers
37
views
RF Microstrip trace polygon
I'm designing a board with an RF L-band trace (around 2.150GHz) on the top layer side. I have a clear and unbroken ground plane on the bottom layer of the trace. However, I'm curious to know whether ...
12
votes
4
answers
3k
views
Pattern on a PCB
I've never worked on power supplies. What is the purpose of the pattern in this image (yellow) ? I don't have this PCB, I only have this photo.
- 1,284