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<p>This section focuses mostly on the AC-to-DC variant.</p>

<p><big> Linear power supply </big></p>
<p><a href="page.php?w=Image%3AWall_wart_opened.JPG">thumb</a>In a linear power supply, the AC input voltage first passes through a <a href="page.php?w=power_transformer">power transformer</a>, then undergoes rectification and filtering to produce a DC voltage. Filtering minimizes the AC mains frequency component present in the rectifier output. It can be as simple as a single capacitor or as complex as a <a href="page.php?w=pi_filter">pi filter</a>. The</p><p>
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