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how_audio_output_works
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Audio output behaves like a voltage source that droops as you draw more and more current. Output impedance, measured in ohms (Ω), characterizes the droop. More Ω more droop. Typically a BJT will require 1/100th to 1/20th the current it is driving at 0.6V, e.g. you need 1-5mA of control current at 0.6V to drive a 100mA load current. How do typical audio outputs measure up to this requirement?
Dell Laptop (200Ω, 4.6mA@0.6V)
DROK TDA7297 12V amplifier
We can't drive an estim circuit directly from audio output – it can barely reach 1V at max volume let alone 100V+ – but can we use audio output to drive an off-the-shelf amplifier which in turn drives an estim? True to its claim, it can boost ~1V audio to 12V.
how_audio_output_works.1467520375.txt.gz · Last modified: 2016/07/03 04:32 by schmidtleonard
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