How to use ESD diodes

Started by Adam Seychell in sci.electronics.design1 week ago 14 replies

I'm trying to protect inputs to an op-amp from the outside world and reading up how ESD protection diodes/TVS can help. Datasheets may claim to...

I'm trying to protect inputs to an op-amp from the outside world and reading up how ESD protection diodes/TVS can help. Datasheets may claim to withstand a particular standard e.g IEC 61000−4−2 (Level 4) which specs 30A peak in the first 1ns, then reduces 8A at 60ns. A small diode obviously has hard time with this and so manufactures give an associated ESD clamping v


What are these windings (?) on an inductor?

Started by Bob Engelhardt in sci.electronics.design1 week ago 21 replies

I have this inductor salvaged from a junked DC stick welder. There are 4 layers of winding and between each pair is this copper sheet. Each...

I have this inductor salvaged from a junked DC stick welder. There are 4 layers of winding and between each pair is this copper sheet. Each sheet has 2 ends, implying that it's a winding, to be connected somehow. https://imgur.com/0Dcu2CM What are they?


OT: Personal aircraft, vertical takeoff and landing

Started by John Doe in sci.electronics.design1 week ago 73 replies

You might have noticed attempts at making personal drones. One problem is very limited flight time/distance. Greater than four engines probably...

You might have noticed attempts at making personal drones. One problem is very limited flight time/distance. Greater than four engines probably helps with safety, but it's still inefficient. So... What about developing such large drones but with vertical takeoff and landing (VTOL) capability. There are apparently an increasing number of VTOL radio controlled aircraft (XK X520, Eachine Mi...


how did they do it?

Started by RichD in sci.electronics.design1 week ago 38 replies

I heard a talk some months back, from one of the investigators of the Antikythera mechanism. Really fascinating. Discovered over 100 years...

I heard a talk some months back, from one of the investigators of the Antikythera mechanism. Really fascinating. Discovered over 100 years ago, it's just recently that they finally reverse engineered it, completely. Or so the speaker claimed. Apparently it was a long development, lasting almost a century, ~ 200 B.C. There's a suspicion that Archimedes had a hand in, but no smoki...


Old mystery, solved.

Started by Phil Hobbs in sci.electronics.design1 week ago 15 replies

This came up when I was planning a drive yesterday. https://electrooptical.net/www/sed/jimmy.png Google really does know everything....

This came up when I was planning a drive yesterday. https://electrooptical.net/www/sed/jimmy.png Google really does know everything. ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo....


COB (Chip On Board) experience

Started by Klaus Kragelund in sci.electronics.design1 week ago 1 reply

Hi I am looking into mounting a chip COB style, to save the cost of the regular...

Hi I am looking into mounting a chip COB style, to save the cost of the regular package https://www.tutorialsweb.com/smt/smd-components/chip-on-board.htm We have clean room in-house, so we will not need to invest in that I see different opinions in different papers, with respect to yield and reliability, thermal shock robustness etc I also see some doing the bonding in non-clean roo...


Possibly the future in high power semiconductors?

Started by Carl in sci.electronics.design1 week ago 1 reply

Several years ago the semiconductor boron arsenide was predicted to have a very high thermal conductivity and now three separate groups have...

Several years ago the semiconductor boron arsenide was predicted to have a very high thermal conductivity and now three separate groups have finally prepared crystals pure and uniform enough to confirm that in three recent Science papers. The crystals are a few mm across and the measured thermal conductivity ranges from about 1000 to 1300 W/m-K. For comparison, silicon is about 150, co...


Haking the newer Harbor Freight Driveway Sensor

Started by amdx in sci.electronics.design1 week ago 15 replies

I want to hack the newer Driveway sensor. I had the old ones all figured out, now they went to all surface mount parts, with a different...

I want to hack the newer Driveway sensor. I had the old ones all figured out, now they went to all surface mount parts, with a different design. I just want to a add a button to trigger the peizo alarm in the receiver. It has an 8 pin chip labeled AT12L and 319H. I think the 319H is the relevant number, but not sure. Might be a pic. The receiver has an RF section, the RF section ...


Mechanics of Materials 4th edition By Hibbeler Chapter 12

Started by Anonymous in sci.electronics.design1 week ago

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buy 3-MMC CRYSTAL online

Started by Anonymous in sci.electronics.design1 week ago

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