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Build a Freezer Alarm Circuit
Save your food with an alarm that alerts you if the freezer’s open.
Build a Wireless Doorbell Pager for the Deaf
Here’s a simple circuit you can build for those who have lost their hearing.
CNC Routers: Backlash
Whether you own or intend to build/buy a CNC router, make it a habit to routinely check for backlash.
The Beginner’s Guide to Digital Electronics
Learn how the numbers “1” and “0” changed the world of analog and digital electronics.
Build a Digital Decade Box
Having the right tool makes any job easier. This decade box allows you to select a required resistance with a couple of switches — so no more checking with an ohmmeter to see the actual resistance value.
How to Use a Transistor as a Switch
The NPN transistor switch can easily solve many design problems.
Build a Wireless Silent Alarm Warning System
This is an inexpensive transmitter /receiver system you can build in one night that will let you know if something is amiss.
Wirespondence, Serial Bluetooth with a Micro, Analog Front End, AM/FM Receiver Restoration
Analog Waves from Digital Signals, DIY Electric Scooter, The Solar Alternative, Driving LEDs with a Microcontroller
Selected questions from past Q&A columns.
Need to brush up on your electronics principles? These multi-part series may be just what you need!