SparkFun Mic Preamp

Description: This is a simple microphone preamplifier circuit for a wide range of microphone types, with good pre-amplification to attach to your larger stereo amplifier. This circuit is suitable for use with normal stereo amplifier line/CD/aux/tape inputs. The microphone preamplifier works great with guitar pickups, piezo disks, and can take both dynamic and electret microphone inputs (preamplifier provides power for electret microphone elements). This is a simple, easy to build circuit that is flexible and very handy when working with microphones and amplifiers.

**Board does not come assembled. ** You will need to purchase the components separately, check the related items at the bottom of the page for available components. Also, reference the schematic for the BOM.

Features:

• Very simple one transistor circuit
• Amplification 35 dB, flat frequency response from 20 Hz to 20 kHz
• Low distortion but certainly not studio quality
• Interface dynamic or electret microphone to a line level audio input in HIFI amplifier or computer soundcard
• Power supply: 9V battery, takes less than 10 mA current
• No special protection circuits used
• No special electrical safety considerations
• 1"x1.5"x0.6"

Documentation:

• Schematic
• Eagle Files
• GitHub (Design Files)