stonehenge regulator

Stone age would be a carbon pile adjusted by a solenoid.

NT

Dynamotor.

Stonehenge! Where the demons dwell Where the banshees live and they do live well Stonehenge! Where a man's a man And the children dance to the Pipes of Pan

Am 27.09.19 um 00:27 schrieb bitrex:

No more banshees and demons. Nowadays: tourists, by the 1000s.

The parking lot is 5 Km away, and an endless stream of people between the parking lot and the stones.

We gave up. The picture is a drive-by shot from the country road, from the moving motorbike. Wide angle lens, obviously without looking through the camera and later cropped/rotated in the computer.

And we got wet! Riding a submarine would have been appropriate for that trip.

Orkney is much better, if you can go there. <

Gerhard

LM2576? Too bad you have the slow-mo 52kHz versions in stock. Would be better if you had the 150kHz LM2596 in stock instead. Time to over-rule the established inventory tyranny.

I rode by on the train to Bath, imagining the scene, without any tourist distractions.

I visited it in the 1970's when you could still wander between the actual stones and actually touch them. Sort of impressive, as it was clearly designed to be.

The astronomical alignments are well documented, but smaller chunks of rock would have done that job equally well.

To put a new part into stock, I have to fill out forms and stuff. We already have 40 different switcher chips in stock. And 75 linear regs. That should be plenty.

The LM2596 is only rated for 40 volts input. The 2576HV is ok to 60. There aren't a lot of high voltage switchers around.

Hey, we do have the 2596ADJ in stock!

Basically, I agree with that assessment of Stonehenge. I used to enjoy sitting on the stones and having a picnic, just as I used to enjoy using Downing St as a shortcut. No more, alas.

However, there are other nearby places that retain the atmosphere: - Avebury ring (largest) - Silbury hill (can't climb it anymore) - West Kennet long barrow and further away: - Stanton Drew stone circles (second largest) - Hetty Pegler's tump (like the West Kennet long barrow) - Kilmartin Glen, in Scotland

The origins of this one are much better documented...

Cheers

Am 27.09.19 um 10:21 schrieb Clive Arthur:

Constructed over a weekend? They should be hired to finish the new Berlin airport!

I have also seen this one on Iceland, still under construction:

/Gerhard

At the lab we have several of these:

Cheers

Phil Hobbs

And what's wrong with old tech? :)

I just approved two designs with the LM2575HVT, another "simple switcher" part. If you want reduce the chances of over-voltage, you can stick a 56-ohm resistor on the input, without too many hurdles to overcome. That does waste some power, though.

Do they make the 2567 in a fixed 12-volt version, so you can remove those programming resistors? I see in the photo that you're using the adjustable version. Also, do you the really need the 12-volt zener? Is that for kickback on the line or what?

Looks like nothing! Efficiency is mediocre, but I'll have a 600 watt power supply, and nothing is getting very hot. The inductor is stressed and is the warmest part. At that frequency, it should be more like 500 uH instead of 100, but a 500 uH 1+ amp inductor would be a monster. I have that 100 uH in stock.

The 1-volt ON drop of the switch isn't a big deal when the supply is

Two resistors are a small price to pay against stocking a zillion different fixed-voltage parts.

I probably don't need the TVS at the output. I was thinking about a startup overshoot, but that actually wouldn't matter in my application... it wouldn't harm anything. The 48V supply will probably come up slow anyhow. I have one coming in from Amazon, to test.

This is astounding:

Free Prime 2-day shipping. 13 cents per watt.

Isn't that 12V TVS cutting things close?

You can trim Amazon urls at the "/ref="

This goes to the same link:

A 12 volt TVS doesn't conduct at 12 volts. More like 14.

If the reg fails, it would push 48 volts into 7 PC boards that are all expecting 12. I could include the TVS and maybe an 0805 series resistor as sacrifial parts, to localize the flames.

The 48V supply will probably

The last MeanWell 48 Volt supply we used in a project took 3 seconds to produce an output. It did not over-shoot.

To protect those parts, use an SCR shutdown with a fuse.