For Sale DSP Headphone Amplifier

[bperboy]

For background, I'm a professional hardware design engineer with over a decade of electronics design experience.

I've been working for a couple months on this DSP headphone amplifier using the following major audio blocks:

• DAC: AK4493S
• Amp: OPA1622
• ADC: AK5572
• DSP: ADAU1467

Audio quality measurements are quite close to the DAC/ADC chip specifications, actually the chip specs are beyond the capability of the audio test equipment I currently have access to (Prism dScope III).

I have two extra units from my prototype build available, would be happy to provide at cost ($375 shipped to USA). The GUI design is still very much a work in progress (using LVGL & SquareLine Studio), so buyer definitely would be able provide some input to that. Firmware updates are very easy with computer + WiFi connection to the unit.

 

[bperboy]

Some additional details:

Output Ports:

• 1/4" headphone jack (32ohm to 600ohm)
• toslink digital output

Input Ports:

• analog line input (initial prototypes use an included 3.5mm adapter cable)
• toslink digital input
• usb input (initial prototypes use an included USB adapter board)

Power Management:

• 120VAC wall power input
• On-board linear transformer
• All analog power supplies are linear with extremely high PSRR

Digital Signal Processor:

• DSP has capability for many bands of parametric EQ, psycho-acoustic bass, mono-summing, etc.
• There is also room for many more DSP algorithms in future - current DSP utilization is less than 10%

 

[bperboy]

Bump on this, willing to drop price to $350.