Cable tester - Delphijustin industries https://delphijustin.biz Making use out of things! Fri, 08 Dec 2023 20:01:41 +0000 en-US hourly 1 https://wordpress.org/?v=6.2.9 https://delphijustin.biz/wp-content/uploads/2025/10/cropped-dongwa-192-32x32.png Cable tester - Delphijustin industries https://delphijustin.biz 32 32 Resistor RJ45 Tester https://delphijustin.biz/resistor-rj45-tester/?utm_source=rss&utm_medium=rss&utm_campaign=resistor-rj45-tester https://delphijustin.biz/resistor-rj45-tester/#respond Fri, 08 Dec 2023 20:01:40 +0000 https://delphijustin.biz/?p=4880 This is a simple network cord tester that uses just 8 unique resistors. The values/wattage doesn’t matter as long as the meter can read them. They should be in the kiloohm range. I have made an Excel spreadsheet file that you can enter all 8 of the resistors and get the total parallel resistance. The …

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]]> This is a simple network cord tester that uses just 8 unique resistors. The values/wattage doesn’t matter as long as the meter can read them. They should be in the kiloohm range. I have made an Excel spreadsheet file that you can enter all 8 of the resistors and get the total parallel resistance. The pins are listed as binary 1s and 0s. J1 and J2 are the RJ45 connectors. I even entered the ones I’m using. It doesn’t tell you if it’s a patch cord, crossover or rollover, but tells you if the pins used on the cord are making connection. To tell what type of cord it is just look at the 2 ends.

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]]> https://delphijustin.biz/resistor-rj45-tester/feed/ 0 DIY cable tester https://delphijustin.biz/diy-cable-tester/?utm_source=rss&utm_medium=rss&utm_campaign=diy-cable-tester https://delphijustin.biz/diy-cable-tester/#respond Sat, 27 Aug 2022 13:36:30 +0000 https://delphijustin.biz/?p=4205 In this blog I will show you two ways to make a cable tester. The 1st way uses a arduino (software controlled). The 2nd way uses a decade counter chip(CD4017) and a flashing LED. I am going to order the Dual RJ45 jack to screw terminals from eBay. The other connectors are from parts-express. I …

Continue reading "DIY cable tester"

The post DIY cable tester first appeared on Delphijustin industries.

]]> In this blog I will show you two ways to make a cable tester. The 1st way uses a arduino (software controlled). The 2nd way uses a decade counter chip(CD4017) and a flashing LED. I am going to order the Dual RJ45 jack to screw terminals from eBay. The other connectors are from parts-express. I couldn’t find one that would tell you that it has screw terminals on parts-express. But starting from 2 dollars off of eBay you couldn’t go wrong! The screw terminals allows secure connections from other types of cords, such as USB and TV coax, whereas punchdown would not be a good choice. The reason for that is each pin on the RJ45 connector will be tied together with the usb cable, coax and rca cables. This tester will tell you which pin on one side is wired to on the other side, tells you if there’s no connection and tells you about any shorts. I ordered connectors that were attached to a cord so that soldering will be easier. It’s basically a LED chaser with two of LEDs in series one for side a and the other one for side b. You can find the arduino code on github. To use simply connect one side of the cord to side a and the other to side b

  • arduino circuit
  • 4017 chip circuit

Once the parts come in a YouTube video will be uploaded

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