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Sapphire 4 headphone amplifier [Rev. 4.1m]

Posted Today at 01:02 AM by rjm (RJM Audio Blog)
Updated Today at 06:17 AM by rjm

[in progress]

Development thread starts here.

While I consider this my best work to date, the documentation trail has become hopelessly scattered and I don't have a write-up on my web page yet, so for the moment let me try to regroup in this blog post and make some sort of gateway/portal to the project.

The followup to the Sapphire 3 started out as a generic musing on stacked diamond buffers and current mirror amplification, coalesced for a bit as the ill-fated Project Unity before becoming part of the Sapphire line initially as a temporary measure, just something I could quickly get up and running in my existing Sapphire chassis. The first iteration kept the open loop buffer of previous Sapphire iterations, but now I'm running the 4.1m boards closed loop I've ended up at just the classic, dictionary definition current feedback amplifier. So be it. It sounds great.


The 4.1m boards feature the option of closed loop...
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