The **1ETDK-R** refers to the **Evaluation Kit** for the **1ET400A** Purifi Eigentakt amplifier module. This specific part is an essential tool for engineers and high-end audio designers to test and implement Purifi's class-D amplification technology. --- ## 1. Component Overview The kit is designed to provide a "plug-and-play" environment for the **1ET400A** module, which is renowned for its extremely low distortion and high power efficiency. | Feature | Description | | :--- | :--- | | **Core Module** | 1ET400A (Eigentakt Technology) | | **Function** | Single-channel (Mono) Evaluation Board | | **Power Output** | 425W @ 4Ω; 227W @ 8Ω | | **Architecture** | Analog-input Class D | | **Interface** | Buffer board with XLR input and banana plug outputs | --- ## 2. Key Electronic Sections The 1ETDK-R consists of several integrated sub-systems that allow the module to operate: ### A. The Front-End Buffer Since the raw 1ET400A module has low input impedance, the evaluation kit includes a high-quality input buffer board. * **Operational Amplifiers:** Typically uses high-grade op-amps (like the OPA1612) to maintain signal integrity. * **Gain Stage:** Provides the necessary voltage gain to drive the module to full power using standard line-level signals. ### B. Connectivity & Power Routing The "R" in the part number often signifies the revision or specific kit configuration. It includes: * **Voltage Rails:** Inputs for Positive/Negative High Voltage (VDP/VDN) and low-voltage auxiliary power (+-12V to 15V). * **Control Logic:** Pins for `FATAL`, `nSMPS_READY`, and `nMUTE` to interface with a Power Supply Unit (PSU) for protection and sequencing. --- ## 3. Technical Specifications The performance of the parts included in the 1ETDK-R kit represents the peak of modern Class-D audio engineering: | Parameter | Value (Typical) | | :--- | :--- | | **THD+N** | <0.00017% @ 100W, 4Ω, 1kHz | | **Dynamic Range** | 131 dB (A-weighted) | | **Output Impedance** | <65 μΩ @ 1kHz | | **Efficiency** | >94% | --- ## 4. Usage Requirements To make the 1ETDK-R functional, it must be paired with external components: 1. **Power Supply:** Requires a high-current split rail DC supply (e.g., Hypex SMPS1200A400). 2. **Heat Dissipation:** While efficient, the module must be mounted to a chassis or heatsink via the aluminum baseplate. 3. **Cabling:** Specialized wire harnesses (often included in the "R" kit) for signal and power. ---