Voltage divider bias circuit.
<a href="//commons.wikimedia.org/wiki/User:Zabacad" class="mw-redirect" title="User:Zabacad">Zabacad</a>
<a href="//commons.wikimedia.org/wiki/File:Voltage_divider_bias.PNG" title="File:Voltage divider bias.PNG">File:Voltage divider bias.PNG</a>