Tiny Professional Microphone Preamplifier

This board has been designed around INA217 low distortion, low noise instrumentation amplifier. The INA217 is ideal for low-level audio signals such as balanced low-impedance microphones. Many industrial, instrumentation, and medical applications also benefit from its low noise and wide bandwidth. Unique distortion cancellation circuitry reduces distortion to extremely low levels, even in high gain. The INA217 provides near-theoretical noise performance for 200Ω source impedance. The INA217 features differential input, low noise, and low distortion that provide superior performance in professional microphone amplifier applications. An OPA2137 OPAMP is used as feedback to eliminate the offset voltage. Phantom power is not part of the circuit board it’s just for reference.

Features

• Supply Dual +/-15V DC
• Output Unbalanced Single Ended
• PR1 Gain Adjust G=1+10000/R_g PR1
• PCB dimensions:

Schematic

Parts List

XLR CANON 3P Female Connector – Product Code: JT2140 (LZ149)

Gain Control

Gerber View

Photos

INA217 Datasheet

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