This past week I have been researching designs and components used in preamp design and building. I’ve found that the most essential component in a preamp is the Operational Amplifier. This component does the step up in level from mic level to line level. Other components in preamp designs serve functions such as filtering, padding, and peak protection. Other features often included are +48v and optional pad. These require additions to the circuit that can be simple depending on how involved their integration is. For mine, I would like to have both options in a simple form.

The first thing I would like to build is the “famous $5 preamp” or something similar. This is a cheap way to have a functional design that I can experiment with. Attached is a picture of the schematic. I have the parts on order or in hand.

The famous $5 preamp schematic