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rfid coffee key
I opened the yellow key you can see on the photo and found out that there is a Philips chip marked PCF7931AS in there. I couldn't find the data sheet for it, but I found some links about what it is
**broken link removed**
https://www.bicotech.com/?page=prod_tu&lg=en
I also...
pcf7931as
I really don't know if this part of the forum is the right place for the question, but I don't know where else to fit it.
Does anybody know how this magnetic keys (I think so as there are no metal connections on it) work?
**broken link removed**
This keys are used in our office for...
open drain mode
Hello!
Can you please tell me what is the difference between push-pull and open-drain mode?
I searched the net and the wiki, but all answers were confusing. Can you please direct me to some site which explains this in detail or maybe you can explain it with some pictures?
I...
Audio splitter
What about impedances and signal power loss because of impedance incompability (in case of...parallel all of the attenuation network to the pc audio output)?
Signal is the size of standard PC sound card (it's on mother board). Is it 0,7V RMS?
Rostfrei
Hello!
I searched arround, but couldn't find appropriate solution to my small problem which is:
My PC has only one audio output (speaker), but I use speaker, headphones and scart cable for watching movies on the TV. Every time I want to use another device I have to go under the table and...
Hello guys!
I'm sure the answer to my question is somewhere out there, but I really don't know under what phraze I should search.
I have the following problem: I have a sound card with only one output, so if I want to use headphones or speakers I constantly have to change cables. What passive...
mbyka I wet trough all directories and exe files and there is no "Al11 -Galep progrmmer schemmatics" so in the future please dont spread any more untruth statesments.
If you have shematics share them with others otherwise be quiet!
hpgl to gerber
Hello!
I want to build my own milling machine.
I discovered that gerber files describes the lines and pads their thicknes and size etc. used by the device called photoplot.
But the milling machine have to mill all around the line to mill out the line in "pool" of copper. That...
Hello!
Is there any project on CompactFlash card reader which you can build at home?
I'll be most grateful for links to the sites or any other form of help!
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