Serenarev1.pdfProduct Overview
The Serena Microphone Kit is a complete condenser microphone solution built around a low-noise OPA-based impedance converter and a precision condenser capsule. It is part of the Sound Sleuth OPA microphone platform, offering a more traditional condenser microphone architecture.
Serena builds on the Samantha platform by using a true externally polarized condenser capsule. This requires a dedicated polarization voltage supply, provided by the included DC-DC converter, enabling high-performance condenser microphone operation.
Design & Performance
Serena builds upon Samantha and takes the platform to the next level. It uses the same OPA-based impedance converter, but replaces the capsule with the the TSC-1, a full 34mm K67-style (center-terminated) cardioid condenser capsule.
Like the JLI2555B used in Samantha, the TSC-1 is manufactured in an ISO9001-certified facility. It has been used extensively across production runs with consistent results, enabling reliable and repeatable microphone builds without the need for capsule matching.
Because the TSC-1 is a true condenser capsule, it requires a stable polarization voltage. This is generated by the included DC-DC Hex Inverter, powered from the regulated supply on the OPA board, providing a consistent ~80VDC bias voltage. This stability improves repeatability and contributes to a higher signal-to-noise ratio compared to typical condenser microphone implementations.
The underlying circuit follows the same design philosophy as Samantha, with a focus on low noise, low distortion, high bandwidth, and high headroom. The use of the Texas Instruments OPA1642 allows the circuit to maintain excellent performance while remaining compatible with phantom-powered operation.
Serena is a highly versatile microphone across a wide range of applications. It performs equally well on close, intimate vocals, high SPL vocal sources, and spoken word applications.
The frequency response remains consistent across the capsule’s cardioid pattern, making Serena well suited for ensembles such as choirs and orchestras. A matched pair can be used in stereo configurations such as ORTF to produce a clear and detailed soundstage.
Serena also excels as a spot microphone for strings and other acoustic instruments. With two, it is possible to achieve a strong and accurate stereo image across a wide variety of sources.
Serena does not attempt to emulate a specific vintage microphone, tube design, or transformer-based circuit. Instead, it provides a clean and neutral response that performs well without extensive post-processing. It simply sounds good—consistently and reliably.
What’s Included
- Single Channel OPA PCB
- DC-DC Hex Inverter PCB
- JLI TSC-1 pure condenser microphone capsule
- 3D printed microphone saddle
- Microphone body and headbasket
- Internal chassis
- Shockmount
- Hard case with custom foam cutouts
- All required connectors, wiring, and hardware
Key Features
- Complete condenser microphone system with matched components
- True externally polarized capsule design
- Low-noise OPA-based electronics for clean signal capture
- Integrated DC-DC converter for capsule polarization voltage
Applications
- Studio recording (vocals, instruments)
- Voiceover and broadcast applications
- DIY and custom condenser microphone builds
Who This Kit Is For
Serena is ideal for builders looking for a traditional condenser microphone design with full control over capsule polarization and performance. It provides a step up in flexibility and capability compared to electret-based designs.
Technical Description
The condenser capsule used in Serena requires an external polarization voltage to charge the diaphragm. This is supplied by the included DC-DC converter, enabling proper operation of the capsule.
The OPA-based impedance converter provides a low-noise interface between the capsule and downstream audio equipment, ensuring stable operation and compatibility with standard microphone preamps.
- Low Self-Noise
Determined primarily by the capsule and circuit design. - Wide Frequency Response
Full-range audio capture for studio and recording applications. - High Dynamic Range
Supports a wide range of signal levels without distortion. - Integrated Polarization Supply
Provides stable high voltage for condenser capsule operation.
Build & Demo Resources
Video Overview:
Serena Microphone Demo
Build Guide:
Step-by-step build instructions
What Else Is Required
Assembly requires basic tools and soldering of a small number of connections. A compatible audio interface or mixer with phantom power is required for operation.
Helpful Pairings
For additional components and customization options, see our DIY microphone parts and accessories.
Frequently Asked Questions
What is the difference between this and an electret microphone?
Serena uses a true condenser capsule that requires an external polarization voltage, while electret microphones have a permanently charged diaphragm and do not require this supply.
Is this a complete kit?
Yes. This kit includes the capsule, electronics, body, and all hardware required to build a complete microphone.
How difficult is assembly?
Assembly is straightforward and involves soldering and mechanical assembly, with slightly more complexity than electret-based designs due to the polarization supply.
