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Secret Knock Activated Drawer Lock Tutorial: Unlock a drawer by knocking a secret pattern.

Adafruit’s Secret Knock Activated Drawer Lock is designed to conceal traditional lock mechanisms – unlocking only when a secret pattern of knocks is detected. Essentially, a solenoid locks secures the drawer while a piezo buzzer “listens” for knocks.

Pierluigi Scotolati - Инфографика - Невозможный мир

Infographic: Electricity A visual cheat sheet. - Infographic: ElectricityA visual cheat sheet about electrical physics, containing the most important formulas of current and Ohm’s law expressed through an impossible water circuit analogy.

Newest Samsung Galaxy and Note fashion slim case with style for the savvy users. Fits well into workout and gym clothes. Great gift home accessory products for Apple iPhone 7 Plus owners, gizmos lovers, current smartphone and cellphone owners, shoppers who o are active in health and fitness and travel  #tech

New Futuristic Style Aluminum Shock and Lifeproof Metal Case for Samsung Galaxy S8 / S8 Plus / Note 8

Slim and thin, more protection with less weight for the newest Samsung Galaxy series.

Meet the Moto Z Force Droid. Capture crystal clear memories witha 21 MP camera featuring image stabilization, then share them quickly on the next gen network. Get yours today with Verizon.

Get Moto Z Force Droid with shatterproof display at Verizon. Moto Mods instantly transform it into a movie projector, boombox or battery powerhouse.

Diagram of a Rhombic Drive Beta type Stirling Engine. Runs well, but requires many bearings.

Diagram of a Rhombic Drive Beta type Stirling Engine. Runs well, but requires many bearings.

Looking for a weekend project? Try building an Arduino-powered LED clock with step-by-step instructions.

Build Your Own Arduino-Powered LED Clock

Ohm's Law Pie Chart

Here’s a handy pie chart that shows the most common expressions for Ohm’s Law. Very useful reference for things like common appliance problems and the Appliantologist Merit Exam.


Examples of rope and pulley systems illustrating mechanical advantage.