For loop for all files in get-childitem one file at a time

Hi all

I come that far now that I arrange files in an array and the script now makes on file for each source file however the data seems to be appended filesizes increase by as much as the filesize would be 6-10kb. I hope anyone can help me out.

$array = @()
$files = @(Get-ChildItem -Path 'C:\test\tu\*.json')
for ($ii=0;$ii -lt $files.Count ;$ii ++){
foreach ($f in $files[$ii]){
$outname = (Split-Path -$f -Leaf).split(".")[0]+".csv"
$response = Get-Content $f -Raw | ConvertFrom-Json
$entity = $response.entity
foreach ($i in $entity){
$array += New-Object psobject -Property @{'datum' = $i.trip_update.trip.start_date; 'entity_id' = $i.id; 'trip_id' = $i.trip_update.trip.trip_id; 'vehicle_id' = $i.trip_update.vehicle.id}
}}
$array |ConvertTo-Csv -NoTypeInformation |Out-File c:\test\out\$outname
}