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Author Archives: Al Williams

Heater is Either a Miracle or a Scam

Posted on November 25, 2025 by Al Williams

[Big Clive] picked up a tiny heater for less than £8 from the usual sources. Would you be shocked to learn that its heating capacity wasn’t as advertised? No, we …read more Continue reading Heater is Either a Miracle or a Scam→

Posted in bigclive, ceramic heater, heater, teardown

Water on Mars? Maybe Not

Posted on November 25, 2025 by Al Williams

We were as excited as anyone when MARSIS (the Mars Advanced Radar for Subsurface and Ionosphere Sounding) experiment announced there was possibly liquid water under the southern polar ice cap. …read more Continue reading Water on Mars? Maybe Not→

Posted in Mars, MRO, Science, Space

Ultrasonic Cutting on the Cheap

Posted on November 24, 2025 by Al Williams

When you think of ultrasonics,  you probably think of a cleaner or maybe a toothbrush. If you are a Star Trek fan, maybe you think of knocking out crew members …read more Continue reading Ultrasonic Cutting on the Cheap→

Posted in tool hacks, ultrasonic cutter, ultrasonic knife

Smelly Ultrasound

Posted on November 24, 2025 by Al Williams

We aren’t sure why, but [Lev Chizhov] and some other researchers have found a way to make you smell things by hitting your head with ultrasound. Apparently, your sense of …read more Continue reading Smelly Ultrasound→

Posted in nose, olfactory, Science, ultrasound | Tagged Smell

Retrotechtacular: Computers in Schools? 1979 Says Yes

Posted on November 23, 2025 by Al Williams

The BBC wanted to show everyone how a computer might be used in schools. A program aired in 1979 asks, “Will Computers Revolutionise Education?” There’s vintage hardware and an appearance …read more Continue reading Retrotechtacular: Computers in Schools? 1979 Says Yes→

Posted in BBC, Education, retrocomputing, Retrotechtacular

Assistive Radio Tells You What You Can’t See

Posted on November 23, 2025 by Al Williams

We think of radios as audio devices, but for people who are visually impaired, it can be difficult to tell which channel you are listening to at any given time. …read more Continue reading Assistive Radio Tells You What You Can’t See→

Posted in assistive technolgy, radio hacks, TEA5767, visually impaired

How to Use That Slide Rule

Posted on November 22, 2025 by Al Williams

You have that slide rule in the back of the closet. Maybe it was from your college days. Maybe it was your Dad’s. Honestly. Do you know how to use …read more Continue reading How to Use That Slide Rule→

Posted in math, retrocomputing, slide rule

A Paper Caper: The Hole Data

Posted on November 21, 2025 by Al Williams

Since the dawn of computers, we’ve tried different ways to store data. These days, you grab data over the network, but you probably remember using optical disks, floppies, or, more …read more Continue reading A Paper Caper: The Hole Data→

Posted in paper tape, punched tape, retrocomputing

Gilbert Cell Lacks Sullivan

Posted on November 21, 2025 by Al Williams

If you’ve ever used an NE602 or similar IC to build a radio, you might have noticed that the datasheet has a “gilbert cell” mixer. What is that? [Electronics for …read more Continue reading Gilbert Cell Lacks Sullivan→

Posted in gilbert cell, matched transistors, radio hacks | Tagged Mixer

Rare Filament Makes Weird Benchies

Posted on November 20, 2025 by Al Williams

[Zack], in addition to being a snappy dresser, has a thing for strange 3D printing filament. How strange? Well, in a recent video, he looks at filaments that require 445 …read more Continue reading Rare Filament Makes Weird Benchies→

Posted in 3d printer filament, 3d Printer hacks, 3D Printing

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