May I inquire as to what the inductor, L1, is doing is this application? I have been trying to utilize USBc and lightning, for small electret capsules from iPhones and relatively recent ?smartphones, and having some troubles.?

On Sat, Feb 10, 2024 at 11:52?AM Mark Kahrs <mark.kahrs@...> wrote:

Here's a version of a USB powered Alice.? Comments welcome since my ability to make errors is well known.

On Fri, Nov 17, 2023 at 8:30?AM Timothy Aguana <lolnetian@...> wrote:

Hello, I've drafted up a DIY design that I think could work to drive an electret capsule like the TSB-2555B through the use of a DC-DC converter () to derive a stepped up voltage from the 5V supply rail of a .?
The generated voltage of the microphone is fed into an amplification circuit from the?

Presented below is the proposed amplification scheme:

Similar to the aforementioned OPA-Alice circuit, the amplifier to be used is planned to be the OPA1642.

The USB soundcard to be integrated to the design utilizes a CM108 IC with an input range of 2.88 V pk-to-pk and a default input signal gain stage of 20dB (gain of 10).

I am relatively new to the design of microphone circuitry and this design is heavily inspired the by videos and instructables from DIY Perkz and DJJules.?

I would like to ask for advice regarding the design choices made and the validity/viability of the proposed design.