All Questions
Tagged with pcb-assembly pcb-design
18
questions with no upvoted or accepted answers
3
votes
0
answers
82
views
Wires under diodes on a PCB: distancer, radiator, ground return loop, or something else?
I recently watched a video by bigclivedotcom and there's one unusal (at least for me) thing on the PCB he presented. That's a switched power supply for a flat TV panel:
Under three parallel power ...
- 306
2
votes
0
answers
314
views
fiducials on a panel
have a little question about fiducials:
My Layouter/My Boss likes to use 3 fiducials on the panelframe and one fiducial on each individual board in the panel.
My job is to build the program for the ...
1
vote
0
answers
71
views
PCB Layout review: ESP-07 with 28BYJ-48 Stepper board
I have used the 28BYJ-48 in conjunction with an ESP8266 in some applications and I thought it would be handy to have pcb made. I want to use JLCPCB including Pick and Place.
The Kicad source code is ...
- 737
1
vote
0
answers
72
views
Flexible PCB design suggestion
I'm currently learning to design a PCB. For this board, I want to sense the current in two different ways (using either analog or digital current sensors). Each sensor requires a current sense ...
- 89
1
vote
0
answers
87
views
Layer thickness design for 4-layer boards
I'm designing a 4-layer PCB, containing a GPS module (u-blox NEO M9N) and a Taoglas antenna. The GPS antenna should be on the top layer, and the GPS receiver should be on the bottom layer.
Besides the ...
- 135
1
vote
0
answers
84
views
PCB Single Local Fiducial
I have a question regarding local fiducials so as to achieve proper alignment of the board, during the soldering of a 0.4mm pitch chip. As I have seen the best practice for local fiducials is to place ...
- 57
1
vote
0
answers
2k
views
How to calculate stray capacitance on PCB
I use a 0.4mm spacing between PCB traces (including 0.4mm space between crystal pads and ground) and I believe that's causing stray capacitance.
My circuit board is typical (1 ounce copper on FR4 ...
1
vote
0
answers
1k
views
Micro-USB connector in middle of PCB?
I have a unique situation where I may want to place a Micro-USB connector on a PCB, but not on the board edge. Mechanically, it would make sense if I could place it towards the middle of the board.
...
- 1,657
0
votes
2
answers
59
views
What is the best solution for wire to board then board to board connection?
Background: Hello, I am a first timer trying to finish this pcb redesign. I am in dire need as an intern who has no clue what they are doing but is having fun learning
I have all my schematics working ...
- 11
0
votes
0
answers
24
views
CJMCU-3652 resistor dimensioning
I bought a CJMCU-3652. It is based upon the LT3652 from Linear Technologies. In the datasheet on page 15 there is a description on how to calculate the resistors to properly
charge whatever battery ...
0
votes
0
answers
43
views
2D mapping of PDB Layout in Allegro
I am trying to export a 2D drawing of my pcb layout in allegro. I would like the layout to include the components and their reference designators. However, I cannot find a way to do so and the ...
- 25
0
votes
0
answers
57
views
How to solder a 5.5x2.1 DC plug to a PCB?
I am looking at mounting a DC plug on the side of my PCB board.
Unfortunately, only jacks exists for purpose of PCB mounting, and there are no mountable plugs produced.
(if they existed, they would ...
- 11
0
votes
0
answers
121
views
PN532 RFID Reader IC taking up 4mA even when there is no power applied
I have designed a custom PCB for one of my side projects. PN532 is interfaced with ESP32 over i2c. Goal is to have the system consume current in uAmps range when in deep sleep. I put ESP32 in deep ...
- 1
0
votes
1
answer
63
views
2 Layer PCBA routing strategy for high current design
I have a very simple pcba design. The only thing of value is that the traces will carry up to 30A of current.
I have already decided to increase copper thickness to 2 oz for improved current capacity.
...
- 757
0
votes
0
answers
246
views
Homemade double sided PCBs and soldering
I etched my own double sided PCBs (no plated through holes) and quickly realized that there will be an issue with making sure contacts on both sides of the board are making a proper connection with ...
- 511