Questions tagged [alignment]

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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. ...
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1 vote
0 answers
94 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 ...
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1 vote
1 answer
149 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 ...
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  • 113
1 vote
2 answers
150 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 ...
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0 votes
4 answers
530 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 ...
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  • 107
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1 answer
163 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 ...
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  • 113
9 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 ...
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  • 798
0 votes
1 answer
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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 ...
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  • 141
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1 answer
634 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€)...
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6 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 ...
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