QRV-04 - The high performance SMD headphone amplifier with multiple feedback Click on the picture to see a preview of the pcb. Interesting features: The pcb fits virtually any single opamp with or wit...

QRV-03 - The high performance current feedback headphone amplifier Click on the picture to get a larger view I got inspired one day when it was much talk about current feedback amps. The performance i...

QRV-02 - The high performance headphone amplifier with multiple feedback Click on the picture to get a larger view. I designed this amplifier as a result of reading postings at HeadWize. The forum is...