Get-EventLogSource

function Get-EventLogSource {
    param ([Parameter(Mandatory, Position = 0)][SupportsWildcards()][string]$Name,
        [Parameter(Position = 1)][string]$LogName)
    $x = Get-ChildItem HKLM:\SYSTEM\CurrentControlSet\Services\EventLog -ErrorAction Ignore |
    ? PSChildName -NE 'Security' | % PSChildName -pv LN |
    % {
        Get-ChildItem HKLM:\SYSTEM\CurrentControlSet\Services\EventLog\$LN -ErrorAction Ignore |
        % PSChildName | % {
            [PSCustomObject]@{ Source = $_; LogName = $LN }
        }
    }
    if ($LogName) { $x = $x | ? LogName -EQ $LogName }
    $x | ? Source -Like $Name
}