Old Ge transistors and Whiskers

Started by Chris M. White in sci.electronics.design10 hours ago 13 replies

Hi, Anyone know if NOS (old, but never used) germanium transistors are prone to forming whiskers to the same extent as used ones? I'm...

Hi, Anyone know if NOS (old, but never used) germanium transistors are prone to forming whiskers to the same extent as used ones? I'm not sure if it's a phenomenon which arises from the electrical potential applied during the service life of the device or not. Anyone know? Chris.


SPICE s parameter measurement for one port network - help please

Started by amal banerjee in sci.electronics.design11 hours ago 7 replies

Could some electronics guru help me a bit ? How would one set up S parameter measurement for a one port network - a dipole antenna ? Let the...

Could some electronics guru help me a bit ? How would one set up S parameter measurement for a one port network - a dipole antenna ? Let the input be a 50 Ohm(Z0) transmission line. What about the other end ? An impedance with the value of tadiayion resistance 377 Ohm maybe ? All hints, suggestions will bwgreatly appreciated. Thanks in advance.


Unsettled: What Climate Science Tells Us, What It Doesn't, and Why It Matters

Started by Joe Gwinn in sci.electronics.design19 hours ago 3 replies

I just finished reading the following book, which may be of interest. The Wall Street Journal reviewed this book: . "?Unsettled?...

I just finished reading the following book, which may be of interest. The Wall Street Journal reviewed this book: . "?Unsettled? Review: The ?Consensus? On Climate", WSJ, By Mark P. Mills, April 25, 2021 4:47 pm ET. Which led me to buy the book on Amazon: .


Onslaught of Subhuman Trash Continues

Started by Fred Bloggs in sci.electronics.design20 hours ago 8 replies

Pfizer Files Federal Lawsuit Against San Diego...

Pfizer Files Federal Lawsuit Against San Diego Employee https://www.nbcsandiego.com/news/pfizer-files-federal-lawsuit-against-san-diego-employee/2801487 /


LD1117 capacitor

Started by Jasen Betts in sci.electronics.design20 hours ago 14 replies

The LD1117 data sheet makes no mention of what type of 10uF capacitor to use at the output. is it stable with ceramic there or does it, like...

The LD1117 data sheet makes no mention of what type of 10uF capacitor to use at the output. is it stable with ceramic there or does it, like the LM1117, need something with more ESR? -- Jasen.


Facebook is too exclusive for me

Started by Rick C in sci.electronics.design23 hours ago 10 replies

I tracked down someone through google pointing to a Facebook page. However, Facebook won't let me join. I can sign up, but before letting me in...

I tracked down someone through google pointing to a Facebook page. However, Facebook won't let me join. I can sign up, but before letting me in the account they want me to verify who I am by contacting friends they have identified for me. Of the five, three I've never seen before in my life. One is a jerk I knew in high school and the last is someone I could contact only with g


A lowpass filter for a DAC

Started by Peter in sci.electronics.design1 day ago 25 replies

Hi All, I am trying to work out the likely phase lag for a lowpass filter whose job is to take out the notches from a DAC. The DAC is 12...

Hi All, I am trying to work out the likely phase lag for a lowpass filter whose job is to take out the notches from a DAC. The DAC is 12 bit and will be generating a 400Hz sinewave. It will be driven at around 250x i.e. 100kHz. So the fundamental to filter out will be 100kHz. I am not good at maths but doing some digging around, it looks like a simple RC has a 45 deg phase shift at th...


wifi command set secrecy - why?

Started by Dimiter_Popoff in sci.electronics.design1 day ago 34 replies

I have been looking for some wifi chip(set) to be able to use in our systems and it has turned out it is impossible to get one which...

I have been looking for some wifi chip(set) to be able to use in our systems and it has turned out it is impossible to get one which is documented in a way we could write our own driver so our tcp/ip stack under dps would treat it as yet another medium, like it does with Ethernet or via PPP and sort of. What I don't get is *why* do they keep things so secret? When wifi was starting there was...


MOV Search

Started by ABLE1 in sci.electronics.basics1 day ago 4 replies

Hello, I am an Alarm Technician among other things or stuff. I was thinking about installing a simple MOV on the Transformer that feeds...

Hello, I am an Alarm Technician among other things or stuff. I was thinking about installing a simple MOV on the Transformer that feeds power to the Alarm Board. The industry standard is 16.5VAC 40VA plug in Transformer. 120 Volt Input. Can anyone point to a specific MOV that would serve as a good lightning or surge protection if placed across the output terminals of the transformer...


OT: alcohol based perfume removal?

Started by T in sci.electronics.design2 days ago 113 replies

Hi All, Anyone with a chemistry background? There are now laundry perfumes and fabric finishes (that are highly scented) that are not meant...

Hi All, Anyone with a chemistry background? There are now laundry perfumes and fabric finishes (that are highly scented) that are not meant to wash out. They toxic substances are very difficult on folks with allergies, especially asthma. They don't wash out. Somewhere that I do not remember, I read that these toxic substances are alcohol soluble and won't wash out in water. Am ...


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