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Inductive Loop Vehicle Present Sensor

Inductive Loop Vehicle Present Sensor

When leaving a parking garage have you ever wondered how the gate knows how to close only after you have pulled out? The magic lies below the concrete, there is an inductive loop in the ground under the gate arm.

Published: February 27th, 2014

Long Nose Robot of Death

Long Nose Robot of Death

  Ok, it isnt actually not a Long Nose Robot of Death even if that is what it looks like Its a Raspberry Pi controlled Tank that can shoot BBs.

Published: February 17th, 2014

Intercom made from a Pair of Corded Phones

Intercom made from a Pair of Corded Phones

Got some old corded phones kicking around from the days before 3 and 4 handset cordless system took over? Why not make them useful again by making an intercom from the.

Published: February 17th, 2014

Fluke 196B Handheld ScopeMeter Repair

Fluke 196B Handheld ScopeMeter Repair

Over at The Signal Path Blog  Shahriar Shahramian has a look at a Fluke 196B Handheld ScopeMeter that he purchased from an eBay seller. The meter was purchased for a few hundred dollars and was listed with a fault that is doesnt power up.

Published: February 12th, 2014

DIY Lab Power Supply

DIY Lab Power Supply

Kerry Wong had a few huge heat sink kicking around, instead of selling them for scrap aluminum he decided to build some useful lab equipment. The first one went into the DIY Electronic Load and the second was used in his DIY Lab Power Supply.

Published: February 9th, 2014

HP 3468A Bench Multimeter Repair

HP 3468A Bench Multimeter Repair

  There are a number of great older bench meters out there that would be perfect when upgrading from a hand held meter when working on the bench.

Published: February 9th, 2014

Use an LED as a Sensors

Use an LED as a Sensors

Michael Beyhs has a new site called Electrical Engineering and More, his first project shows us how to Use an LED as a Sensor. LEDs are normally used to produce light but like many other electrical items it works a bit in the other direction, meaning that it will produce a small voltage when you shine light into it.

Published: February 9th, 2014

DIY 4 Channel Electronic Load

DIY 4 Channel Electronic Load

Instead of keeping a dozen sizes of power resistors on hand to test your variety of power supplies an electronic load allows you to dial in the exact load you are looking for.

Published: February 9th, 2014

Ammo Box Stereo

Ammo Box Stereo

When you take your portable radio to the beach are you always making sure nothing rubs against it so you keep the finish scratch free. If the kids are playing close to it you make sure they dont have anything more dangerous than a rubber ducky since you know it will end up falling on your shiny radio.

Published: February 9th, 2014

Car Stereo Amp Repair

Car Stereo Amp Repair

This amp sure had a ton of issues. Maxxarcade found that there were multiple shorted transistors that needed to be replaced. The amp was built with the TO-220 power transistors tab soldered to a thin heatsink.

Published: February 1st, 2014


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