thank you Mickz,i ll give it a shot if i cant find another solution.I don’t have a close up picture. However these caps are very simple to fit. They either bolt in or have a solder flange. The bolt-in caps are easiest as you can use a diecast box from someone like Jaycar.
I mentioned a few posts back the number of caps required is 14. This allows for the USB connection to be filtered. Wiring is simple. All common leads are joined together either side of the cap. All +5v are joined together, same with +12v and +3.3 volt leads. This means one feed through for each voltage.
I finally received the FM-DAB radio module a few days ago and just finished writing the DAB-FM control software for my CAR –PC. I fitted the radio module up front in the car as I had USB, FM aerial and audio leads running back to the PC in the boot from there.
There is a slight audio noise that can be heard when the radio volume is low or the radio muted.
This noise is not from the long audio lines. I was surprised that I could turn the amp volume up and touch the active audio inputs to any ground or chassis point in the front of the car and have absolutely no PSU or PC noise through the speaker. – No earth loops of any kind.
Disconnecting the serial made no difference. The noise is simply some residual PSU noise on the USB +5v line that powers the DAB-FM radio module. When I get a chance I will add a filter to the USB supply line and that should remove this slight noise.
The FM aerial is in the Rear glass and even with the boot open I get all FM stations with no noticeable interference from the PSU or PC. The PC is only a few feet away and all the cables from the PC to the front of the car run within a foot of this aerial. The Feed through caps and shielded enclose really make a difference here.
I will be mounting a digital aerial up front with auto-switching it between FM and DAB aerials once I find a suitable dig aerial.