At a certain moment in our lives all of us wanted to be a fire fighter. To simulate that effect, we created a super-awesome siren. With two 555-timer chips and lots of trail and error, we were able to create this awful noise.
We're sorry for all headphone users...
Just updated your iPhone to iOS 18? You'll find a ton of hot new features for some of your most-used Apple apps. Dive in and see for yourself:
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Infrared LEDs Protect Your License Plate Number from Police Cams
How To:
Light a light bulb with a potato battery
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Recycle an old satellite dish into a WiFi booster
How To:
Make a DTV antenna & a steadicam
How To:
Fix Dead Lithium-Ion Batteries That Won't Hold a Charge Anymore
How To:
Eavesdrop from a Distance with This DIY Parabolic 'Spy' Microphone
How To:
Turn Any Wall Portrait into Your Own Personal Scooby Dooish "Eye" Spy Surveillance System
How To:
Build a weatherproof compact high gain WiFi antenna
How To:
Turn Your Android Device into a Customizable Thermostat for Your Home
How To:
Make a PVC Hand Pump to Move Water, Compress Air, & Create Vacuum
How To:
Extract an RFID chip from a card & make it wearable
How To:
DIY Stick Welder from Old Microwave Parts
How To:
Convert Your Old Apple iMac G4 into a Cable-Ready HDTV
How To:
Make a homemade fractal antenna for HD and digital TV reception
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Make a DIY vehicle immobilizer to stop car thieves
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Build a mini hovercraft with household items
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Hack a 20-Year-Old "Brick" Phone into a Digital Cell You Can Text On
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Build a laser tripwire that can trigger anything out of a photoresistor
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