Category Archives: rectifier

Modified Tombstone Welder Contains a Host of Hacks

State-of-the-art welding machines aren’t cheap, and for good reason: pushing around that much current in a controlled way and doing it over an entire workday takes some heavy-duty parts. There are bargains to be found, though, especially in the most basic of machines: AC stick welders. The familiar and aptly …read more

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Posted in AC. DC, arc welding, GMAW, microwave oven transformer, MOT, rectifier, Silicon Controlled Rectifier, tig, tool hacks, tungsten, welding | Leave a comment

Wind Turbine Pushes Limits Of Desktop 3D Printing

There was a time, not so long ago, when hype for desktop 3D printing as so high that it seemed you could print anything. Just imagine it, and your handy dandy magical 3D printer could manifest it into reality. But now that more people have had first hand experience with the technology, the bubble has burst. Reality has sobered us up a bit, and today we’ve got a much better idea of what can and cannot be printed on a traditional desktop 3D printer.

But that doesn’t mean we aren’t surprised from time to time. As a perfect example, take …read more

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Posted in generator, green hacks, rectifier, stepper motor, turbine, wind power | Leave a comment

A Switching Power Supply, 1940s-Style

“They don’t build ’em like they used to.” There’s plenty of truth to that old saw, especially when a switch-mode power supply from the 1940s still works with its original parts. But when said power supply is about the size of a smallish toddler and twice as heavy, building them like the old days isn’t everything it’s cracked up to be.

The power supply that [Ken Shirriff] dives into comes from an ongoing restoration of a vintage teletype we covered recently. In that post we noted the “mysterious blue glow” of the tubes in the power supply, which [Ken] decided …read more

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Posted in current loop, rectifier, restoration, retrocomputing, smps, switch mode power supply, teletype, thyratron | Leave a comment

A Vacuum Tube and Barbecue Lighter X-Ray Generator

A certain subset of readers will remember a time when common knowledge held that sitting too close to the TV put you in mortal peril. We were warned to stay at least six feet back to avoid the X-rays supposedly pouring forth from the screen. Nobody but our moms believed it, so there we sat, transfixed and mere inches from the Radiation King, working on our tans as we caught up on the latest cartoons. We all grew up mostly OK, so it must have been a hoax.

Or was it? It turns out that getting X-rays from vacuum tubes …read more

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Posted in high voltage, misc hacks, piezoelectric, radiation, rectifier, x-ray | Leave a comment