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#datasheet

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My latest blog post: Make Cisco Catalyst 2960-X switches run almost silently

mikecoats.com/cisco-2960x-quie

Cisco Catalyst 2960-X 48-port PoE switches can be had on eBay for under £100. This seems like a great deal until you power them up. They have a single blower fan and it screams; during normal operation they're unreasonably loud for most homes.

mikecoats.comMake Cisco Catalyst 2960-X switches run almost silently – mikecoats.com

Trying to understand a datasheet of a NTC, Murata NXFT15XH103FEAB021. They specify the beta/B value, very good, I understand how to calculate temperature / resistance with it.

But they also mention other B-Constants as "Reference Values" for different temperature ranges. I don't understand what they want to tell me with them. Can anyone explain?

murata.com/en-eu/products/prod

Continued thread

So I dug around until I found a #current part that exceeds all the #specs of the old one. Of course it's a different size, and a completely #incompatible #pinout, so I'm going to have to #bodge it, but I half-expected that anyway.

Just getting a #datasheet for the old part, to figure out what specs it had to have, was surprisingly #difficult. What is it with some companies thinking the specs for the product they want you to buy are Top Secret?

8/x

Good Morning, fellow #RetroComputing #Fedizens !

Let's start the day with some #NewRetro goodness for motivation, shall we?

Yesterday, I built a small test setup to connect the #My4th machine to a #Breadboard which is equipped with a #BMP180 #Temperature #Sensor.

Then, I went ahead and used what little #Forth I have learned so far along with the My4th custom words 'i2c-start', 'i2c-send', 'i2c-recv' and 'i2c-stop' to try to read raw temperature data from the sensor. And: it works!

I now need to figure out how I can get a reasonable temperature value from it, checking the BMP180 #Datasheet again ...

#I2C
#RetroComputing

Continued thread

Obviously, looking through my junk stack, I found what is probably the successor of that chip, the TK9207. No idea about what's different, because for this too there's no #datasheet...