1 1 micro volt gives 3 mv to the ear bud or 30 mv to the head phone.
This will be tomorrows build if I get shop time. The sim was a little unstable. when I added the divider - filter on the input it became stable (in sim).
The 300 - 3k hertz frequency response is good. It rolls off well before the MW band so should be immune to the local boomer bleed thru.
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