Welcome to the N1IR Electronics Website. Totally off the cuff, one take, unrehearsed video projects for anyone interested in amateur radio, electronic design, makers, hardware hackers and science.

Get off you duff and build something!
Training the hand and mind since 1982.

Tuesday, December 5, 2017

Project 12/8/17 Cable Tester

This weeks project for the sophomore class in shop is a CAT 5 Cable tester.

A cable tester is a device that is used to test the strength and connectivity of a particular type of cable or other wired assemblies. There are a number of different types of cable testers, each able to test a specific type of cable or wire. This one can be used for CAT 5, coaxial or any cable that has two conductors or more

The student breadboard and test the circuit our then mill out the PCB using a T-Tech 5000 PCB mill.

Project PCB and enclosure

Below is an example PCB CAD Design of the board

Friday, December 1, 2017

Project 12/1/17 Clock

Digital clock project, this is the same on featured at  


We made 8 clocks, students learned how to breadboard, mill a PCB and how to burn a ATMEGA328 using AVRDUDE.

Friday, November 24, 2017

Project 11/24/17 Fox and Hound Part 1

The Fox & Hound wire and cable tracing kit consists of a versatile Fox 2 tone generator (toner) and a high performance Hound inductive amplifier (probe). Featuring adjustable sensitivity, and Warble or Pulse tracer tone selector. Students learn breadboard, PCB milling, design and use a Epilog M2 Laser cutter to make a custom the enclosure made from 1/8 inch plywood.

Tune in soon for part 2 the Hound.

Student breadboard of the FOX Student Breadboard of the HOUND

 PCB mill design and final design

 Student cut enclosure using our Epilog Laser Cutter

Assembly of the FOX

Monday, November 20, 2017

TV Repair

Student repairing a LCD TV, TV was brought in form a teacher and the complaint was it did not turn on, below is a picture of what we found. Broken mains line, re soldered and up and working!

Friday, November 17, 2017

Project 11/17/17 TPS

Triple Power Supply Project

A must have in any laboratory, on a test bench, or for experimentation. This power supply is 3 variable power supplies in one unit. It features ±1VDC to ±15VDC at 2 Amps and 5VDC up to 5 Amps. 

Student learn the basics of linear voltage regulators (LM317/LM337), 16x2 Parallel loading LCD screens controlled by Arduino, bread-boarding, PCB design as well as custom enclosure design using our Epilog M2 laser cutter.

Also cover in this project is OPAMP signal conditioning using a LM324, Buffers, Inverting Amps and Dividers. Scaling, A2D conversion and math functions of the Arduino. 

Student finishing touches on TPS

Custom Enclosure using 1/4 inch Plywood

Tuesday, November 7, 2017

Arduino Clone

Find and test communications to chip

sudo avrdude -c usbtiny -p m328p

Erase Chip

sudo avrdude -c usbtiny -p m328p -e

Burn Main Hex file program

sudo avrdude -c usbtiny -p m328p -U flash:w:optiboot_atmega328.hex

Burn Fuses

sudo avrdude -c usbtiny -p m328p -U lfuse:w:0xFF:m -U hfuse:w:0xDE:m -U efuse:w:0x05:m

Friday, October 20, 2017

Scoreboard Fixed

One of our senior students troubleshot the scoreboard on the field today and found a faulty 1/4 inch TRS cable, Using a ohmmeter he ringed out the cable and found that the tip and ring were open from one end to the other. He then took it back to the shop and repaired the cable.

Picture of the broken cable, can you see the break in the wire?

Answer: No, this couldn't be seen visually, DMM is needed and the knowledge of how to use it.