  If you still have a few floppy drives left over after making your Floppy Drive CNC machine have a look at making some music by making a Floppy Disk Jukebox!  “The overall setup is completly modular. Each floppy is connected to its own floppy driver (rrfdc), which in turn speaks I²C with the main board (rrcmd). On power-on the main board auto-discovers the connected floppies and adjusts the
If you are fixing some used electronics chances are you will come across some bad caps that are causing some issues. Capacitors have a property known as ESR or equivalent series resistance. Caps will often test fine with a capacitor value check but are still bad. There are two types of capacitor ESR meters, in circuit and out of circuit. The in circuit meter will, as the name implies
Long time maker Bob Davis has made a Robo-Raptor that is controlled by an Arduino. When the stock electronics in a product don’t do what you want just hack some new brains into them! This robot is from the pages of his book, Arduino Robotics Projects.
Ian Johnston purchased a used Pioneer amplifier that was slightly defective. The amplifier would not function when the tone controls are switched in (this amp has a bypass switch which allows these controls to be bypassed). Turns out that the amplifier was fine, the issue was missing RCA Jumper Links , you can see what these jumpers normally look like in the picture below. This amplifier doesn’t have a
Instead of using keys and codes for security this device that Ankur Thakkar, Darshan Shah and Saisrinivasan Mohankumar built as part of their ece4760 Final Project uses gestures to grant access. The system uses IR sensors to determine the movement of a persons hand within the detection area, after you train the unlock pattern you can simply repeat the pattern to activate the device. I think a small miniature
Check out the Electric Scooter MK-1 Build Log, Dane from transistor-man.com has done some cold weather testing and it looks like it works quite well! “The electrical layout for the MK 1 scooter is fairly straightforward. Everything starts from the 12S 4p cylindrical battery module. A Cooper Bussman 120A circuit breaker sits between the battery and the rest of the scooter. Note that, while there are a number of
This Infrared Eye-Tracking Computer Mouse uses some interesting methods of creating a eye controlled computer mouse. The intent is the you would be able to ditch the desk mouse and simply put on a pair of glasses. The system would be a self contained battery operated system that doesn’t have you tethered to your computer with a cable. “We have a pair of 3-D printed glasses with plastic lenses.
