Hacked Gadgets Forum

January 31, 2014

DIY Lab Power Supply

at 8:11 pm. Filed under DIY Hacks

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.

DIY Lab Power Supply Build Details 1

DIY Lab Power Supply Build Details 2

DIY Lab Power Supply Build Details 3

 “The voltage/current setting resolution and accuracy are largely determined by the quality of the voltage reference and DAC used. Given the 12-bit DAC I used, the voltage adjustment resolution is roughly 7.3mV and the current adjustment resolution is roughly 2.4mA. Of course, you can always use higher resolution DACs (e.g. 16 bit) to obtain even finer adjustment resolutions. But for typical use, 12-bit resolution is more than enough and it gives you the best bang for the buck. The INL/DNL error from DAC can be calibrated and corrected in software, which makes the voltage/current setting even more accurate.”



DIY Lab Power Supply_1

Use an LED as a Sensors

at 7:59 am. Filed under DIY Hacks, Electronic Hacks

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.

“How the code works:

  • Configure all analog inputs to outputs and pull low to turn on all red LEDs.
  • Turn one analog input pin into an actual Input and read the amount of light that is reflected into it.
  • Turn that input back into an output and continue on to next.
  • After all inputs have been read adjust the PWM of the blue LEDs according to the amount of light that was measured.
  • loop forever…”

Ammo Box Stereo

at 2:39 am. Filed under Cool Gadgets, DIY Hacks

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 don’t have anything more dangerous than a rubber ducky since you know it will end up falling on your shiny radio.  The Ammo Box Stereo by Noah Farrington is the solution to this issue, it is built like a tank because it probably spend most of its life bouncing around in one. The guts aren’t built from scratch since there is no reason to reinvent the wheel.

January 29, 2014

HP 3468A Bench Multimeter Repair

at 6:58 am. Filed under Cool Gadgets, Electronic Hacks

 New capacitors installed. Unit boots up and passes self-test.


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. The HP 3468A meter can be had for under $200 in good working condition and often around $100 for a unit that powers on but no operation confirmed. Modemhead purchased one that was DOA, have a look at the pictures he took of the internal construction when he disassembled it for repair. The construction is top notch! Turns out the fuse was blown by some shorted capacitors in the power supply section.

January 27, 2014

Ball Bearing Motor – How does it work?

at 7:03 pm. Filed under Cool Gadgets


Ok, this is a very interesting motor that RimstarOrg built with some scrap wood, two bearings, a bolt and some nuts. It is connected to a low voltage high current power source and can magically spin (or can it???). Watch the video to 3:20 but no further. Is this a real motor? Is there some careful camera tricks at work here? If it is real how does it work? Leave your guess and thoughts in the comments (trying not to read other comments).

Now watch the rest of the video. Is that what you expected? I didn’t think that was what was going on…


January 26, 2014

Name the Thing Contest – 247

at 12:09 am. Filed under Contests



The prize this week is an Arduino Pro Mini. This contest will run for one week (January 26 – 31, 2014). Ending time is based on central standard time. To enter, identify the item above and what it can be used for. Please note the image above is a side view of the thing.

Please do not give the answer in the comments.

Send an email to contest @ hackedgadgets.com with “Name the Thing Contest” as the subject, and the message body consisting of:

  • The name of the item in the above picture
  • An example of what the item pictured above can be used for

The winner will be chosen at random from all of the correct entries.


Added April 13, 2014

The item to guess was a Creamware SCOPE Pro.

The winner is Brent . (there were 186 entries)


Below is a picture of the prize.


Coke Bottle Test Cheat

at 12:04 am. Filed under Funny Hacks



We have all been there. Cramming all the formulas for a test into your brain isn’t working, and of course this isn’t a real world scenario since in the real world you can use whatever reference materials you need to aid you in completing a task. In my opinion the real result is knowing how to solve problems with formulas, not necessarily the strict memorization of them. That being said please don’t complain when you are kicked out of school for cheating with your bottle of coke…


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