You just hit the nail on the head with availability of good FETs. TI has a really nice one that is extremely low noise but is SMD is a weird package?
Best Regards,
Jules Ryckebusch?
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On Jul 3, 2024, at 11:30, kennjava via groups.io <ken@...> wrote:
?On Tue, Jul 2, 2024 at 11:28 AM, sergio_logic wrote:
is there a significant drawback that I’m missing here?
It looks interesting. I have the following questions:
- One of the biggest hurdles to making FET impedance converters is the scarcity of suitably good FET transistors. Does this circuit/technique help to make more FETs "suitable"?
- Being a DIY group, adjusting the trimpot to set the bias on a pimped Alice board isn't a big drawback for most of us. Does the servo approach offer other advantages, like superior audio performance?
- Conversely... would the active servo itself be a potential source of additional noise?
Anyway, this looks intriguing, and something that could be beneficial in a mass-produced generic head amp for electret and condenser mics. I look forward to your results when you test some prototypes.
