If the display of your PC-E500S Sharp Pocket Computer has lost its contrast and shows different black bars on the left and right side (see images below), then it might be possible to do a simple repair job on it. Most likly it's the two capacitors for the display power regulator that failed…
What if you'd like to control your HiFi with your smartphone, but it lacks the needed interface? One solution could be to emulate your ir-remote with an Arduino. That's what I did with my Onkyo TX-SR309. First hook an oscilloscope to the IR diode of your remote control and try to measure the carrier frequency.…
The J12 foot-controller is a very heavily built device, and IMHO one of the best guitar foot-controllers out there. Unfortunately it uses the proprietary Digitech protocol, even though it has the standard MIDI connector. Information of the Digitech protocol is literally non existent, so I decided to have a closer look. Starting with taking it…
