General reference
Things worth knowing that don’t belong to any one subject. What the Moon is doing tonight, how to read the odd symbols in a dictionary, which pencil is which, and how long division goes again.
Quick answers
Phases of the Moon →What the Moon looks like right now, the eight phases in order, why it’s “upside down” in Australia, and the date of every new and full moon.
International Phonetic Alphabet →How to read the pronunciations in a dictionary, every sound of Australian English with an example word, and the full chart.
Pencil grades →The scale from 9H to 9B, what H, B, F and HB stand for, and which pencil to use for writing, drafting, sketching and shading.
Long division →The four steps with worked examples. Type in any sum and see the whole working set out the way you’d write it.
Around the house and the workbench
For the battery, plug, screw or old disc in your hand.
Battery equivalents →Every button, coin and household battery, with its size, its other names and what replaces it.
Connector reference →Every plug and port you’ll meet in Australia, with dimensions and photos, side by side.
PC and laptop screws →Every screw in a computer, and the driver that fits it.
Storage media field guide →Identify any old disc, tape, floppy or memory card, and find out what can read it.
HDMI versions and plugs →Every HDMI version and plug, and what ARC and eARC do.
BM786 multimeter guide →Every feature of the EEVblog BM786, and how and when to use it.
Radio and signals
Radio frequencies in Australia →What’s on which frequency in Sydney, NSW and every capital city.
The radio spectrum →From DC to daylight: every band, and what lives in it.
Morse code translator →Text to dots and dashes and back, with sound, and the full code table.
Music
Musical signs, symbols and terms →A searchable reference of musical symbols and an A–Z of terms, with charts of note values, key signatures, scales and chords.
Piano chords →The common chords on the keyboard, with finger numbers for both hands and a button to hear each.
Blank staff paper →Manuscript paper to print, in five sizes, as A4 and US Letter PDFs.
Words and numbers
AI technical terms →Top-p, top-k, temperature and the rest, in plain words.
Unit converter →Length, weight, temperature, volume and more.
Percentage calculator →Percent of, percent change, and what percent one number is of another.
BSB lookup →Which bank and state an Australian BSB number belongs to.
More topics
Music →Free sheet music, chords, music theory and tools to practise with.
Electronics →Lessons from the first volt to ten Arduino experiments, multimeter guides and reference pages.
Radio →Software-defined radio, Australian frequencies and twelve weekend projects.
All topics →Everything we write about, sorted by subject.