Diamond Differential Current Mode Preamp & Headphone Amp Kit, Wilson Current Mirror Architecture, High-End DIY Audio

Options:

1. Standard Version - Bare Board
2. Standard Version - Kit (see details in parts list)
3. Standard Version - Fully Assembled
4. Combo Version - Semi-Assembled 1 (see diagram notes)
5. Combo Version - Semi-Assembled 2 (see diagram notes)
6. Combo Version - Semi-Assembled 3 (see diagram notes)
7. Combo Version - Fully Assembled
8. 16-Type Shunt-Style Potentiometer Full Set

This preamplifier board operates entirely in Class A mode.
The PCB layout and manufacturing craftsmanship are exceptionally refined and precise.
It belongs to the high-end Hi-Fi enthusiast-grade preamplifier circuit.
It is recommended to connect high-quality audio sources and supply power to high-end amplifiers (or headphones).
Note: The operational amplifier IC in the circuit is used for DC servo and does not participate in audio amplification.

Combo Version:
Dimensions: 160mm x 200mm x 50mm (excluding standoff height)
Fully mirrored L-R layout
Power Supply: AC/24-0-24V AC/24-0-24V
Mono independent Class A parallel regulated power supply, low noise and low impedance

No negative feedback, no phase compensation, fully linear with no coloration, short signal path for low distortion.
Smooth and detailed high frequencies, dense midrange, powerful and deep-reaching bass.
Wide soundstage with precise imaging, warm sound signature, silent background with no audible noise.

Signal path: Input buffer → 8 current mirrors (transmission) → Buffer output.
Waltman FET parallel buffers operating in pure Class A mode.
A total of 16 current mirror modules are used across the board.
Four Waltman single-stage parallel buffers, all thermally coupled with aluminum bars.
Output impedance ~1Ω, capable of driving any common headphones with ease.

Standard Version:
This board does not include a power supply or thermal coupling.
Main amplification configuration/parameters are the same as the Combo Version.
Dimensions: 100mm x 190mm x 22mm (excluding standoff height), fully mirrored L-R layout.
Power Supply: DC/±22V. If conditions allow, mono independent power supplies are recommended.

Between the current transmission and buffer output, a parallel shunt-style (I/V) volume interface is provided.
It controls the current signal, ensuring smooth frequency response without loss of detail.
This method is significantly more effective than volume control at the amplifier input.
However, mechanical potentiometers in shunt configuration cannot reach absolute zero, and volume may not completely mute.
If this is a concern, use a voltage-divider volume control at the signal input.