The PD-DOPA-A is a premium evolution of the legendary "Alice" microphone circuit. This kit moves away from factory-built SMD boards to offer a deliberate, high-quality "DIY" experience for the audio enthusiast.
The circuit utilizes ultra-low distortion Operational Amplifiers and an onboard 80V power supply circuit to support true condenser capsules (K47/K67 style), delivering a pristine, studio-ready tool with a nearly non-existent noise floor.
Build Experience & Skill Level:This kit is specifically engineered for builders who enjoy the process of soldering and component selection.
Primarily THT: All resistors, capacitors, and diodes are Through-Hole Technology (THT).
Hybrid SMD Elements: To achieve modern performance, the Op-Amp (U1) and Hex Inverter (U2) are surface-mount components.
Hand-Solder Friendly: These two SMD chips are standard SOIC packages and can be easily soldered with a fine-tip iron and steady hand—no micro-soldering station required.
Technical Highlights:
Tonal Customization: Includes guidance for "Tone Shaping" using specific output coupling and HF damping capacitor values to match your capsule and preference.
Integrated Design: Both the power (charge pump) and audio circuits are hosted on a single, high-quality PCB.
Boutique Quality: Features a guard ring design in the high-impedance area to protect signal integrity.
What’s Included:
(1) High-quality PCB.
All necessary board-level components: Resistors (including 1GΩ), Electrolytic/Ceramic Capacitors, Diodes, and ICs.
Comprehensive Digital Build Guide (PDF).
What You Will Need:
A donor microphone body.
A true condenser capsule (K47 or K67 style) and saddle.
Basic tools: Soldering iron, multimeter, and 90%+ Isopropyl alcohol for cleaning.
| Feature | Detail |
| Circuit Type | Dual Op-Amp Alice-Style |
| Polarization | Onboard 80V Charge Pump |
| Assembly | 95% Through-Hole (2 SMD ICs) |
| Tone Options | Selectable LF and HF tuning |