HMSVILLEELECTRONIC PROJECT KIT

Ohmsville — The early-80s spring-terminal electronics lab, alive in your browser — free, no account, nothing to install. Real parts smoke; a shop teacher’s in the manual.

OPEN THE KIT SEE THE PROJECTS
✓ NOTHING TO INSTALL✓ REAL CIRCUIT SIMULATOR✓ AGES 10 TO 99
OHMSVILLE
LAB MANUALevery project explained
30 in ONE
ELECTRONIC PROJECT KIT
30PROJECTS
LIFT THE LID

THE CLASSROOM

FIVE UNITS · TWELVE LESSONS · TOTALLY SKIPPABLE · THE TEACHER CHECKS YOUR ANSWERS
ON THE BOARD TODAY

INTRO TO
ELECTRONICS

Nobody makes you take the class. The bench runs fine without it. The class is where you find out why the flasher flashes and why the 100 Ω smokes.

0 OF 12 PASSED
TAKE YOUR SEAT →
  1. 1 Charge and the loop 2 LESSONS
  2. 2 Ohm's law 2 LESSONS
  3. 3 Parts that do something 3 LESSONS
  4. 4 Circuits that move 2 LESSONS
  5. 5 The shop 3 LESSONS

THE KIDS ZONE

AGES 6 TO 10 · NO SIGN-IN · NOTHING TO TYPE
Eight things to build Parts are chunky blocks. Tap two and they snap together — a light comes on, a speaker sings, and the sun changes the sound. OPEN THE KIDS ZONE → Hi! I'm Rezzy. Let's make a light come on!

THE SPOOKY SCIENCE LAB

OPEN NOW · OCTOBER
7 chapters, 7 builds The shop is shut, the lights are off, and something in the 200-in-1 is still running. ENTER SPOOKY SCIENCE LAB →

ON YOUTUBE

THE SHOP CLASS ON FILM · 12 LESSONS · 29 MINUTES
Watch the course Every lesson recorded off this bench: the wires appear, the LED lights, the meter reads. Same shop teacher, same builds, and each film has its page here to try it yourself. OPEN THE CHANNEL →

The Intro to Electronics playlist → · read the lessons here →

FROM THE BLOG

DEV LOG · HOW THE KIT WORKS · ALL POSTS →
2026-11-24 Meet Teddy Ruiz, who came in the back door to borrow a vice and never went home The last of seven. Teddy sweeps up, fixes bikes out the back, and says try it and see before anybody has finished asking. Nothing happening is his favourite part, because nothing happening means something is loose.2026-11-17 Meet June Marchetti, who minds the front table on Saturday mornings Part six of seven. Sal's daughter grew up in the back of the shop watching the little kids' table, and then one Saturday her father pulled a stool over. She is the one who will let a six-year-old hold a part.2026-11-10 Meet Nate Pruitt, which is me, so I asked myself the same six questions Part five of seven. I write these posts, so this week I wrote the questions down and answered them at my own kitchen table. A two-transistor blinker at nine, forty years of not looking, and a Saturday morning I handed the lid to somebody else.

THE REAL ONES

THE KITS THIS IS BUILT FROM · CLICK ONE TO SEE IT LARGE
Science Fair 150 in 1 — the box, the tray, and a Radio Shack receipt
Science Fair AM-FM Radio Kit, catalogue number 28-175: box, manual, board, and the earphone still on its cord
160 in ONE with its lab-type manual open on the table
160 in ONE board: colour-blocked zones, chrome springs, a real meter
300 in One Electronic Project Lab, box art
300 in One: the console years, with a breadboard in the middle
Radio Shack 300 in One, catalogue number 28-270
200 in ONE Electronic Project Lab, fitted workcase with cover
200 in 1: "Come with me to the world of NOR gates, flip-flops, transistors and LEDs…"
200 in 1 open: green case, blue panels, the wires still in there
200 in ONE under its clear lid
The 200 in 1 board from above, battery holder and all
A parts legend card: how the manual taught you to read the components
Electronics Learning Lab box art: "Over 200 projects and experiments", in English and Spanish
Electronics Learning Lab in its box: LED bank, milliamp meter, a real breadboard, relay, and four blue buttons