Maybe you ought to consider a buck-boost regulator like this device: -



It's not a "beginners project" but it will do exactly what you want I believe and work with voltage supplies well below your 75V output voltage level. Top input voltage is limited to 80V.

Are there any way to get (75V 1A) output from 78V input
Im trying to create a login section on my website using PDO.

So far I've the following...

config.php
    

    // Connect to DB
    $username = 'user@site.co.uk';
    $password = 'pass';

    try {
        $conn = new PDO('mysql:host=localhost;dbname=db', $username, $password);    
        $conn-&gt;setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        } 
    catch(PDOException $e) {
        echo 'ERROR: ' . $e-&gt;getMessage();
        }

?&gt;


header.php 
    

// DB Config
include '/assets/config.php';

// User Session
$login = 'liam';
$pass = 'password';

$sth = $conn-&gt;prepare("SELECT * FROM access_users WHERE login = ? AND pass = ?");
$sth-&gt;bindParam(1, $login);
$sth-&gt;bindParam(2, $pass);
$sth-&gt;execute();

if ($sth-&gt;rowCount() &gt; 0)
{
  // session stuff,
 // refresh page
}  

?&gt;


My browser doesn't display the page however, and when I view my source theres no data contained within, can anybody see where im going wrong? 
