PowerShell - random password gen

$pswCharacters = 7
$pswDigits = 4
$pswSpecialChars = @("!","@","$")
$pswUseSpecialChars = $true

function fnc_randomPsw
{
    $constants = ('b', 'c', 'd', 'f', 'g', 'h', 'j', 'k', 'l', 'm', 'n', 'p', 'r', 's', 't', 'v', 'w', 'x', 'y', 'z')
    $vowels = ('a', 'e', 'i', 'o', 'u')

    $pswWord = ""

    $useConstant = $true

    for ($i = 1; $i -le $pswCharacters; $i++)
    {
        if ($useConstant)
        {
            $pswWord += Get-Random -InputObject $constants
            $useConstant = $false
        }
        else
        {
            $pswWord += Get-Random -InputObject $vowels
            $useConstant = $true
        }
    }

    $pswWordUpper = $pswWord[0].ToString().ToUpper()
    $pswWordFinal = $pswWordUpper + $pswWord.ToString().Remove(0, 1)

    if ($pswUseSpecialChars)
    {
        $pswWordFinal += (Get-Random -InputObject $pswSpecialChars).ToString()
    }

    $pswNmbrs = ""
    for ($i = 1; $i -le $pswDigits; $i++)
    {
        $pswNmbrs += (Get-Random -Minimum 0 -Maximum 9).ToString()
    }

    $pswWordFinal += $pswNmbrs

    return $pswWordFinal
}

fnc_randomPsw