Huh? Since When--?

That's why I specified tightening. He claimed that it was a 'sonic screwdriver', whereas it's just an oscillator driving a resonant piezo. Probably you want a screwdriver to turn both ways....

Cheers

Phil Hobbs

Ah, he didn't specify that this was a *bidirectional* sonic screwdriver... big difference there, you know? With a bidirectional sonic screwdriver, sure you'd get tightening as well as loosening.

But yeah, I wouldn't buy that it could tighten screws, even if it was bidirectional.

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You want proof of concept, take a speaker box (if you can find one) with two screws on it. Place on the box a spaker connected to a frequency generataor and tune up the frequency; at one point-- if the sound is intense enough (i.e "loud") the screws will start to turn upwards. And of course, if the screws are at their top/terminal position to begin with, getting the right freq and the screws will go down-- this of course is easier as you don't hav gravity to contend with. :-)

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That only works for a specific frequency and doesn't work if the input frequency is being frequency modulated. Besides, why add more complications to an already sophisticated circuit that fits in a barely pocket-sized (9 to 11 in.) device? Who wants a foot-long screwdriver?

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Sure it does. Why wouldn't it?

I have several. But yours isn't one.

Cheers

Phil Hobbs

Everybody knows that vibration can loosen screws--that's what lock washers and torque wrenches are there to prevent.

Cheers

Phil Hobbs

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Hmm not to nit pick... (OK I am nit picking :^) But I as far as I can remember Dr. Who never used his sonic screwdriver for tightening screws.

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Yeah it works on the voltage. (not the frequency.) You have to feed it a known amplitude triangle wave. (I'm reply to the OP and not to you Phil... And please correct me if I'm wrong.) The exar does something similar inside.

George H.

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His maintenance guy had one too. ;)

(I haven't watched a Dr. Who episode since I was a kid. I never watch TV unless I'm stuck in some hotel without a good book, and even then I just find some documentary or in a pinch the weather report. TV is both boring and depressing.)

Cheers

Phil Hobbs

Must not have had the bidirectional model... just my guess, I've never even seen a Dr. Who episode.

The original sonic screwdriver was made with vacuum tubes and had space left over. Then again, it was much bigger on the inside than on the outside.

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Yeah Dr. Who was on some afternoon when I was an undergrad. A crowd would gather to watch... which made it fun.

All I watch on TV these days is occasional sports, (corrupted by my Dad, so I=92m a Buffalo fan) and nature/ science shows on PBS with the kids.

I never go anywhere without a book in my possession. With my nose tucked into some trashy novel long lines become enjoyable.

George H.

Anyone who needs the proper hand tools. Some of mine are 36", and I have a custom flexible stainless steel 1/8" blade that is 42 inches to reach into equipment to adjust hidden controls. I also have a lot of

Like the empty policies of the current administration.

Just more 'grade F' science fiction. :(

I've got a 6 footer, absolutely necessary to get thru fire-breaks. But I've never seen a 24 footer ;-) ...Jim Thompson

But that reminds me, I've used 20' sections of PVC pipe to thread wire (and coax and CAT-5) thru my old flat-roofed house... pre-thread the pipe sections with the wire, then shove the PVC from a roof side vent under the insulation to a ceiling cut-out... great fun :-( ...Jim Thompson

A six foot 'Diversibit' and three 6' extensions. We used them when I was teaching people to install alarm systems in the late '70s. They were used to get from the basement to the attic in two story houses, or to drill a straight row of holes in studs to run under a row of windows.

Not as much as running wire in a department store, over a drop tile celing that's 30 feet off the floor. We had to use rolling scaffolding, and remove some tiles, then the cable was tied to a full roll of Scotch