OPA Alice - Dual Channel

Product Overview

The Dual Channel OPA Alice PCB is an ultra-low noise impedance converter PCB designed for DIY microphones. Made for builders and experimenters, it provides two ultra-low noise signal paths, impedance conversion, and simple installation while enabling stereo, multi-pattern, and dual-capsule microphone designs.

Ideal for DIY microphone builds, this product helps simplify wiring and installation.

Key Features

• Dual-channel OPA-based microphone circuit
• Low-noise impedance conversion
• 12VDC output to bias electret microphones
• Mates with our DC-DC Hex Inverter for a complete solution for condenser microphones

Applications

• DIY microphone builds
• Microphone upgrades and modifications
• Custom audio electronics projects

What Does Dual Channel Enable?

Compared to a single-channel design, the dual-channel configuration supports more advanced microphone builds and greater design flexibility.

For detailed guidance on wiring, channel routing, and post-processing workflows, see our Dual Output Microphone Application Guide .

• Stereo microphone builds
  Suitable for stereo microphone projects using matched capsules in configurations such as XY, ORTF, or spaced pair arrangements.
• Multi-pattern condenser microphones
  Supports dual-capsule microphone designs used for selectable pickup patterns such as cardioid, omni, and figure-8, depending on the overall circuit and switching arrangement.
• Matched dual-capsule designs
  Useful in applications where two closely matched signal paths are desired for consistent performance between channels.
• Two independent microphone circuits in one body
  Allows two separate microphone channels to be integrated into a single enclosure for compact custom builds.
• Cleaner, more compact builds
  Using one dual-channel board can simplify wiring and reduce component count compared to installing two separate single-channel boards.

Technical Description

This compact PCB provides a solution for DIY microphone builds. Built around a low-noise OPA-based impedance converter, the circuit adds only about 1 dB of self-noise beyond the capsule, ensuring the microphone’s noise performance is determined by the capsule itself rather than the electronics.

Designed specifically for builders and experimenters, it helps simplify the cost and complexity of creating high-performance custom microphones.

• Ultra-Low Noise Signal Paths
  The OPA-based impedance converters add approximately 1 dB of self-noise, allowing the capsule to define the microphone’s noise floor rather than the electronics.
• Integrated Capsule Bias Supply
  12VDC output provides stable polarization voltage for electret capsules, eliminating the need for external bias circuitry. The 12VDC output can also drive our DC-DC Hex Inverter for a complete solution for condenser microphones
• Designed for Modern DIY Microphone Projects
  Compatible with a wide range of microphone capsules and optimized for low distortion, balanced output, and strong RF immunity.

Specifications

Helpful Pairings

This product may be used with our TSC-2, JLI-86U, and JLI-CK12 depending on your application.

Frequently Asked Questions

What does this circuit do?
This board provides two low-noise impedance conversion channels for condenser or electret microphone designs, making it suitable for stereo, dual-capsule, and other advanced DIY microphone builds.

What type of microphones is this used for?
It is designed for use with condenser microphone capsules or electret microphone capsules in custom or modified microphone builds.

What other components are required?
A microphone capsule, microphone body, and supporting hardware are typically required to complete a build. A bias generator is also needed for a condenser microphone.