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tpetar,
2mA is low for LED indeed. However, it is still 10 times of the 0.2mA continuous specification. I wonder if it is too large to discharge it for several seconds?
Many CR2032 gives 15mA as its peak pulse current. However, how long can the "pulse" last? Should it be a few mSec's, or even...
betwixt,
But the spec of CR2032 says that the continuous is only 0.19mA. If the LED draws 2mA, it is 10x larger, and does it damage the cell after running for like several hours (it seems outrageously long for a 10x-larger current)?
Jack
Hi,
We are trying to design a small keychain-like system. One requirement is that there needs to be small light indicators when some buttons are pressed. It should look like the picture below:
The question is that is the small light in the picture a LED light? What current does it require? We...
bhav,
Just asked a factory and they say they will bake the old BGA chips prior to soldering, and this guarantees that moisture is removed. Same thing:)
Dear experts,
I have a variety of stored components, some of them were bought last year, some early this year. These components include moisture sensitive BGA CPUs, DDR2 memory chips and so on.
I wonder if in a new board I can still reuse the stored components? These components have been...
Hi,
If in a region on the PCB board, over several layers we intentionally remove copper so that there is only dielectric FR4 in the area, then how should we calculate the thickness of this FR4 region?
First, if there is no copper, would FR4 layer over and immediately beneath the area...
ZASto,
Why "cooling" would make the difference? How can they open and micro probe the chip without damaging it (the assembly house need to give it back to me after soldering)?
Jack
It is not in original manufacturer's tray. I am making a prototyping board so I ordered only one chip from a distributor which was sent to me wrapped in anti-electrostatic package. They don't charge for this test for small-quantity prototyping boards.
I had no knowledge of electrostatic shock...
Hi,
If for some reason such as IP security concerns, I don’t want the PCB assembly house to know the actual type of chip that I use, can I abrade the majority its top marking off and leave only the “A1” pin mark?
Does it depend on the actual type of BGA one is using? For example, like in the...
Hi,
A PCB assembly factory told me that they require the relative voltage between BGA balls, which I don’t understand.
For example, for a 256-ball BGA chip:
They would first set the multi-meter mode to “diodes”.
Then they measures the relative “resistance” (what the technicians said, which I...
loosemoose,
Thanks for the answer; no NDA at all.
Another question is that do merely the external layers {top, bottom} suffice for their purpose of generating the NDA?
Jack
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