mystery tool

Started by RichD in sci.electronics.basics7 months ago 4 replies

In a hardware store, I saw a rectangular bar, 10" long, with two through holes, labeled "MAGNETIZE" and "DEMAGNETIZE". Presumably it has a...

In a hardware store, I saw a rectangular bar, 10" long, with two through holes, labeled "MAGNETIZE" and "DEMAGNETIZE". Presumably it has a battery compartment, though I didn't check. What's inside? -- Rich


EVs Will Soon Be Vastly Cheaper To Own Than Carbon Fuel Vehicles

Started by Bret Cahill in sci.electronics.basics7 months ago 32 replies

Daimler and others already pointed out that the battery upon which Tesla's e-Semi is based does not exist. Tesla isn't just hoping a better...

Daimler and others already pointed out that the battery upon which Tesla's e-Semi is based does not exist. Tesla isn't just hoping a better battery will appear, however. They have good information on it and it isn't all that insider: http://www.businessinsider.com/new-discovery-could-be-death-blow-to-traditional-lithium-ion-batt eries-2017-12 https://www.theguardian.com/environment/2017/dec


Even Tesla Missed This Low Hanging Fruit Calculation

Started by Bret Cahill in sci.electronics.basics7 months ago

> https://www.engadget.com/2018/03/22/tesla-says-underpaid-because-batteries-too-fast/ > > It looks like Tesla's batteries are too fast for...

> https://www.engadget.com/2018/03/22/tesla-says-underpaid-because-batteries-too-fast/ > > It looks like Tesla's batteries are too fast for their own good. As the Sydney > Morning Herald reports, the company claims it's not being properly paid for > the electricity its South Australia battery farm is generating for the > country's power grid. And Tesla says its because its batteries supply


Old Uneducated Me Again, Transistor Circuit

Started by Anonymous in sci.electronics.basics7 months ago 7 replies

I have designed and built a few things that worked. But I always used the sledge hammer approach when it comes to impedance. I made the output...

I have designed and built a few things that worked. But I always used the sledge hammer approach when it comes to impedance. I made the output impedance of the stage much lower than the input impedance of the next. Upon further reflection, I think that sometime this is a waste and actually may be not all that effective. These are the the throes of an almost old Man so don't tear


wiping contact on aluminum

Started by malua mada! in sci.electronics.basics7 months ago 8 replies

I need to bleed static out of a moving aluminum structure. I have a springy aluminum tongue (flashing) wiping on an aluminum arm (flat stock...

I need to bleed static out of a moving aluminum structure. I have a springy aluminum tongue (flashing) wiping on an aluminum arm (flat stock 1"). Continuity is good to start with but after a year or so fails. Wiping pressure is still fine, and continuity between any two points on either tongue *or* arm is fine but not between the two pieces. I thought this was an improvement on a copper wire co...


Are Brushless Hub Motors External Rotor Relunctance?

Started by Bret Cahill in sci.electronics.basics8 months ago 1 reply

Don't want to google this one.

Don't want to google this one.


It worked !!!

Started by Anonymous in sci.electronics.basics8 months ago 10 replies

My shop is a steel building similar to a quonset hut. The pipes to my bathroom sink run down inside one of the deep corrugations....

My shop is a steel building similar to a quonset hut. The pipes to my bathroom sink run down inside one of the deep corrugations. The bathroom walls are covered in drywall which in turn is covered with thin sheets of vinyl covered Masonite. I insulated the pipes before covering them with the drywall. I then put insulation down inside the corrugations to insulate the walls. But I thin...


Rare Earth Motors Not Necessary for EVs

Started by Bret Cahill in sci.electronics.basics8 months ago 8 replies

Just use the cheap low power low power density 10 kW motors that have been around for decades. If you want to scoot through intersections and...

Just use the cheap low power low power density 10 kW motors that have been around for decades. If you want to scoot through intersections and accelerate to freeway speeds in seconds use compressed air for short bursts of 100 kW power. This technology has already been proven by UPS and Peugeot. Bret Cahill


Where to download FREE manuals for newer electronics?

Started by Anonymous in sci.electronics.basics8 months ago 10 replies

Most of the manuals for the very old electronics, especially tube gear, can be gotten online for free. But I am looking for a manual for a...

Most of the manuals for the very old electronics, especially tube gear, can be gotten online for free. But I am looking for a manual for a newer piece of equipment. All I am finding are bogus websites that try to get me to download something else, or sites that want payment for a PDF file download. I did find one site that actually had the manual, but it was written in a foreign language ...


Solar storm could strike Earth Thursday: What you need to know

Started by Mr. Man-wai Chang in sci.electronics.basics8 months ago 2 replies

Solar storm could strike Earth Thursday: What you need to know Full story: A solar storm is forecast to hit Earth early Thursday after...

Solar storm could strike Earth Thursday: What you need to know Full story: A solar storm is forecast to hit Earth early Thursday after the Sun unleashed a powerful solar flare ? a burst of high-energy radiation ? Sunday night. NASA?s Solar Dynamics Observatory Satellite cap


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