Monday, September 23, 2019

Ear bud or small speaker amp

100uv signal will drive the earbud.
1mv signal produces 400ua which is half the ear bubs max rating.
10 mv is near 4ma drive which is enough to burn out my earbud.
My earbud is rated 100dbm and 1ma max drive.
This amp will require some limiting to keep from damaging my earbud.
What if the output stage used 2 mosfets? I have the 2 -200Ohm resistors limiting the output stage current. I tested the circuit without the 200 Ohm resistors and it produced 20 ma signal. That may be another project.

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