I think you've got C1 in there backwards - positive voltage from U1 output?
-Scott
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On 2/10/24 13:52, 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 (IEB0105S12
<>)
to derive a stepped up voltage from the 5V supply rail of a USB
soundcard
<>.
The generated voltage of the microphone is fed into an
amplification circuit from the OPA-Alice circuit.
<>
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.
--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
"I have ceased distinguishing between the religious and the secular,
for everything is holy" - Joe Henry
