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Questions tagged [alignment]

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1 vote
1 answer
42 views

Locking BLDC motor rotor for encoder zeroing calibration

I know the title of this post is a real tong twister but my brain is in much worse condition as far as what's goin on here. Basically I have a motor that I'm installing an encoder onto so it can be ...
Dave2022's user avatar
1 vote
1 answer
246 views

Sensorless BLDC motor alignment methods

I have been trying to make a FOC for BLDC motor controlling, but I am stuck at the state that before open loop state which single alignment of the motor control. The question and the explanation is ...
Semih Urtekin's user avatar
2 votes
1 answer
177 views

Custom Memory Allocator - How to find the required alignment for a platform?

I'm building a portable arena allocator for embedded systems. Like for malloc, one of the requirements is to return a pointer aligned with the memory. The question ...
gbt's user avatar
  • 713
2 votes
3 answers
7k views

ON/OFF rocker switches - convention about which side should be top/bottom?

Is there a technical convention (maybe unofficial) as to which side to mount upwards ? I imagine there could be such a guideline, because the marking could rub off or users might have impaired vision. ...
tobalt's user avatar
  • 22.5k
1 vote
0 answers
98 views

GPS PPS Signal Duty Cycle? [duplicate]

just like the title says, I'm trying to figure out the duty cycle of a GPS's Pulse Per Second Signal. This post and accompanying answers seem to indicate something like a 10% duty cycle: GPS PPS ...
TimingConfusion's user avatar
1 vote
1 answer
675 views

How to tell flat flexible cable(FFC) alignment when inserting?

I have an MSR with an 8 pin FFC with contacts on one side. I don't know if there is a top and bottom and if so how to tell the orientation. There is writing on the contact side I assume to indicate ...
willpnw's user avatar
  • 113
1 vote
2 answers
356 views

Aligning PCBA on a plastic enclosure

I am trying to align a PCBA very accurately (within +/- 0.5mm positional tolerance) on a plastic enclosure. I'm thinking about using two 2mm diameter dowel pin that is press-fitted into the plastic ...
Philip C's user avatar
0 votes
4 answers
848 views

Why does unaligned memory read require extra clock cycles?

I believe I understand how memory reads work with the 8086 processor. The 8086 has a 20-bit address bus and 16-bit data bus (multiplexed). The memory module consists of two memory banks, and the LSB ...
obe's user avatar
  • 119
0 votes
1 answer
192 views

How are complicated PCBs designed? [closed]

Firstly, I've always wondered how do engineers calculate the right parameters of components (caps, resistors, inductors, ...) in big projects, such as mobile motherboards and etc. It feels rather ...
krlc's user avatar
  • 113
8 votes
3 answers
2k views

PCB enclosure tolerances [closed]

I can imagine problems of PCBs not fitting into their enclosures or misaligned screw/hole pairs. Are these type of problems common, especially with the dirt cheap enclosures? I am planning to use one ...
kellogs's user avatar
  • 1,061
0 votes
1 answer
302 views

Audio amplifier alignment procedure questions

I have a couple of questions related to the alignment procedure for the amplifier of Klipsch SW-12, a powered subwoofer. Its service manual (link below) says the following: (page 3) COMPRESSION ...
zeron's user avatar
  • 141
0 votes
1 answer
815 views

How can I align chips on PCB?

I am searching for a method/device for aligning chips with pins/pads underneath, like QFN, LGA, BGA and others. I've been searching the Internet, but I could find anything except expensive (several k€)...
Cristian M's user avatar
8 votes
1 answer
2k views

Centroid of component for pick and place machine using Eagle

Just finished designing a PCB and sent the Gerbers off to my board house (Bittele) and they have requested that I also provide them with a pick and place file. Using Eagle, I ran mountsmd.ulp and ...
macdonaldtomw's user avatar