Anyone have any experience with LC75742 1/2 duty VFD driver?
I have come across this driver in a factory car sound system, the whole front comes off as a single unit (buttons and display) and the 2 connectors that connect it to the main unit have their pinout sink screened onto the PCB, I was wondering if anyone had interfaced with it before as I am looking at options to upgrade the sound system but keep the factory look.
I Am going to try and inject audio into the CD lines first and make it simple, but if that does not work, I would use some sort of mp3 player board and use an arduino as the interface between the factory fascia and the mp3 player.
I understand that i will have to figure out what segments do what, but wondered if anyone had worked with it before and could give me a bit of a head start.
I am not sure what you are going to do but the manufacturers put a lot of work in the radios keeping noise, birdies, interference and many other things from causing problems. One of the critical factors is the routing of the internal wiring. Changing this may cause some interesting problems but then that is the fun part.
Good Luck & Have Fun!
Gil
this is the factory head unit https://i.imgur.com/CVWInzY.jpg
even though it looks like a single din unit, it is not, that whole panel from the silver line up is the face of the unit, inside, it is basically 2 single din units bolted together (the black part actually sits in the middle of the 2) the bottom unit being the main head-unit electronics and the top being the 6 stacker.
My goal is to gut the cd stacker portion and replace it with a raspberry pi, an LCD (located elsewhere), an arduino to "fake" the cd changer, the audio from the RPi will go into the factory head unit via the L/R audio channels of the stacker, the arduino will communicate with the head unit via serial and tell it what the cd, track and run time is and also receive from the HU the next track and the like button pushes that will then be sent to the RPi.
it will still be using the preamp in the main headunit and the factory amp under the seat.
there is no factory aux in for these early units and no mp3 cd support. there are after market aux inputs, but they are $300+ and do not work the best (have one in another car)
I could just take this out but i really like the look and sound quality of the factory unit. the screen will be hidden and mainly for changing settings and viewing performance data from the obdII port.
