I want to use the headphone output from an MP3 player to drive a homemade audio amp. How can I be sure I do not damage the headphone output by drawing too much current?
Tim K.
Headphone output current
Jun 19, 2007
2 Replies
Normally this would not be a problem, as headphones are about 32 ohms impedance, and your homebrew amplifier should be a much higher impedance, say 10000 ohms.
But if you get your amp design wrong, I would suggest a series resistor of say 1Kohms in series with a nonpolar capacitor of 47uF
63V, to protect your MP3 playermartin
That won't happen. More likely damage the input of your amp unless you designed it to accept signals of a 1000mv or so.
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