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Chris Johnson
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CJ
CJ

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GAL16V8 PLD
In shop today we programmed up a Binary to Seven Segment Hex Display Decoder. Unlike the 74LS47 Seven Segment Decoder it can not display above 10. With the GAL16V8 we can programming in CUPL we can make our own custom designed gates. We also  have the optio...
GAL16V8 PLD
GAL16V8 PLD
n1ir.com
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Catastrophic failure of the Dimension SST 3D Printer
We had the 3D printer print an object over the weekend and came in on Monday to find this: This is our old machine that uses solid filament to print, as you can see the head, injectors and fan are completely blown away. New head is about 5K and the printer ...
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Typical Shop Day
Here is a typical day with a lab, this was the 12th grade shop assignment for the day. We were to construct a 4520 4 bit counter and test to make sure it works, then and design and build a 8 bit counter using two 4520's. A counter is a digital circuit which...
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Objet 360 3D Printer Down!
Our new 3-D printer was out of commission today, it gave a pre-print over current error during the start up process. We only have one service call for this machine a year, due to our service contract. So to save money for the school, I would make an attempt...
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Cat 5 Network cable tester Box
Here are some photo of my students using a bench top mini mill machine to build a enclosure for the cat 5 network cable tester project. We used a Jiffy box for this project to speed up the production. We used a table top mini mill to mill out square holes i...
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Laser Cut Board Surf Board
During this years open house we were approached by a person in the district that wanted to duplicate a surf board kit. The original kit was laser cut and we would like to make a duplicate, below are some pic of the ribs being traced. we came up with a way t...
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Reverse Engineer of the T-Tech 5000 Milling Machine Part 1
Some of my students found a T-Tech 5000 that was broken and unusable so we decide to fix it. At the same time see how it worked. Some mechanical issues we had to sort out first: * Top & Bottom Teflon Lead Screw Missing, We found used ones in storage (lucky)...
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Drill Battery Charger Modifaction
Here is a modification to a Milwaukee battery charger, one of the MFW instructors wanted to power 12 volts externally to the charger and battery, basically use the charger and battery as a power source. So my students took the charger apart and did some res...
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Project Camping Candle
This project was designed and built by one of my seniors, we wanted to make a fake candle using LED's. We came up with two LM555 astable multivibrator oscillators at two different frequencies and diode OR'ing the outputs to an blue LED, these two frequencie...
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Project 12/21/17 Digital Dice
Here is a project that my seniors are working on, Digital Dice. We used a 74LS193 Counter and a 74LS47 Decoder and a 74LS00 NAND Gate. How it works. The counter counts from 1-6 and displays the count on the 7 segment display. So the first count starts at 0 ...
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