Isolated DMX splitter
Introduction When you need to connect DMX projectors you can use wireless or cable. In my case, I have a fixed setup so I use a wire solution. But the problem with DMX is the low immunity regarding disturbances. When a connexion is lost in the chain all the projectors after the losy connection are
Marantz PM350 : How to repair a vintage amp
Introduction A guy bring to me a MARANTZ PM350 amplifier. He says that to have a little sound the volume button has to be set to the maximum. And, it only works on left channel. The PM350 is a vintage (1980) audio amplifier designed by MARANTZ. I used it several years and the sound is
Mic to line amplifier
Introduction So I needed to connect a standard microphone to a conventional speaker amplifier. The signal comming out the mic is really low. It can be lower than 20mV. You need to amplify the signal to the line level. That’s why with the component I have in stock I do this simple microphone pre-amplifier. The
Getting DMX data in a PIC
Introduction When I need to change the functions of a fixture I use the DMX bus to drive them. This article presents you the software code I use (in C language) to decode the data. I’m using it on PIC MCU from Microchip. It may be possible to adapt the code for other hardware. DMX