In the article he calculates the headphone power to be 4 microwatts. The silver cell produces 0.7 Volts unloaded and drops to about 0.5 volts under load. The phones are 110 DBM. They produce 110 DB sound pressure at 1 milliwatt. Need a math wiz here 1 microwatt is 1/1000 of a milliwatt so..........
The question I had was how much signal it would take to drive a headphone or earbud. The headphone is 110 DBM and the earbud is 90 DBM. From what he says I thinking just a few microwatts.
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