juggling parts

Started by Anonymous in sci.electronics.design3 weeks ago 49 replies

Once you have a few resistors on a schematic, it's tempting to do what you want using existing values. That reduces the BOM and...

Once you have a few resistors on a schematic, it's tempting to do what you want using existing values. That reduces the BOM and the pick-and-place setup. There are far more possibilities if you are willing to compromise things some, or put resistors in series and parallel. This is a 4-page schematic with 9 different resistors. Doing this is an enormous PITA. https://www.dropbox.com/s/aoz...


annular ring issue

Started by Anonymous in sci.electronics.design3 weeks ago 34 replies

I'm planning a 4 or 6 layer board with all 2 oz copper and thin FR4 dielectrics. Given a thru-hole multi-row connector (like a 3x32 DIN) I...

I'm planning a 4 or 6 layer board with all 2 oz copper and thin FR4 dielectrics. Given a thru-hole multi-row connector (like a 3x32 DIN) I want to ground some pins. The grounded pins would hit an inner ground plane flood-over, namely no thermals. Clearly annular rings on the pad stack wouldn't matter on those layers; it's all copper. But where other pins aren't grounded, I want mimin...


Problems we don't need

Started by Sylvia Else in sci.electronics.design3 weeks ago 30 replies

Bought a couple of oscilloscope probes today to replace those damaged/lost. They don't fit, because the plastic surround exceeds the specified...

Bought a couple of oscilloscope probes today to replace those damaged/lost. They don't fit, because the plastic surround exceeds the specified diameter for a BNC plug. My scope has a hole in its front plate to accommodate a standard BNC plug, but it's not big enough for this oversized plastic variant. This probably saves several cents per probe, but created a problem I didn't need. ...


Helion Energy Raise $500 million

Started by Dean Hoffman in sci.electronics.design3 weeks ago 54 replies

The first paragraph: "Nov 5 (Reuters) - Helion Energy, a fusion energy tech startup, on Friday said it raised $500 million to build a net...

The first paragraph: "Nov 5 (Reuters) - Helion Energy, a fusion energy tech startup, on Friday said it raised $500 million to build a net positive electrical generator, one that creates more power than it uses."


A Tesla Joke

Started by Rick C in sci.electronics.design3 weeks ago 3 replies

A highway patrolman pulled alongside a Tesla speeding on the highway. Looki= ng at the car, he was astounded to see that the elderly woman behind...

A highway patrolman pulled alongside a Tesla speeding on the highway. Looki= ng at the car, he was astounded to see that the elderly woman behind the wh= eel was knitting. The trooper cranked down his window and yelled to the driver, =E2=80=9CPull= over!=E2=80=9D =E2=80=9CNo!=E2=80=9D the woman yelled back, =E2=80=9CCardigan!=E2=80=9D --=20 Rick C. - Get 1,000 miles of free Su...


Walmart's Driverless Delivery Vehicle

Started by Dean Hoffman in sci.electronics.design3 weeks ago 7 replies

The sound is just some elevator type music. The music is better at my dentist's office.

The sound is just some elevator type music. The music is better at my dentist's office.


OT. Lunar Eclipse

Started by Dean Hoffman in sci.electronics.design3 weeks ago


Another Pearl Harbor ?

Started by Phil Allison in sci.electronics.design3 weeks ago 51 replies

Hi, see Aussie news item about China preparing to attack US war...

Hi, see Aussie news item about China preparing to attack US war ships. https://7news.com.au/news/world/new-satellite-images-show-china-building-mockups-of-us-navy-ships-c-4479446 Anyone who has seen the movie " Tora Tora Tora " will remember how Japanese Naval Airmen practiced their surprise attack on Pearl Harbor in late 1941 - using scale models of the target area and movi


There are STM32s in Digikey

Started by LM in sci.electronics.design3 weeks ago 22 replies

If they stay in stock, life is getting better.

If they stay in stock, life is getting better.


OT: Not a smoke alarm

Started by Anthony William Sloman in sci.electronics.design3 weeks ago 6 replies

My wife got me out of bed this morning because our electric hot water tank was imitating a smoke alarm. It was also projecting a rather fat...

My wife got me out of bed this morning because our electric hot water tank was imitating a smoke alarm. It was also projecting a rather fat spot of red light on the wall next to it. It wasn't actually the hot water tank, but the electrically driven water valve that shuts off the cold water feed into the hot water tank if the catching tray under the tank holds more than a centimetre depth of ...


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