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catcat said:Can those audio power amp ic's be used with a single-polarity 9-v supply?
Your hearing has a logarithmic resonse to loudness, so you can hear the huge difference between a pin dropped and a jet plane nearby. Twice as much power into a speaker is only slightly louder. 10 times the power into a speaker is just twice as loud.catcat said:When I was expirementing, I found out it's the current that makes the volume, so I can belive that there was no difference between 400w and 5.6w.
If you need to ask this then you don't know enough about electronics to even consider building something like this.catcat said:P.S. Is a 9-v battery a single polarity source?
catcat said:It is for use with large 8 ohm speakers.
When I was expirementing, I found out it's the current that makes the volume, so I can belive that there was no difference between 400w and 5.6w.
What the heck is I^2R? Power= I squared, times R.Zane83 said:Sorry for being silly to ask this... from the theory of P=I^2R. We can increase the power (w) by increasing the resistance too???
audioguru said:You can connect an adjustable resistor in series with headphones because the power is very low so the adjustable resistor won't burn like if it fed a speaker.
With the pot shorted, the headphone gets full power, with the pot at max resistance then it limits the current so the headphone gets hardly any current and its power is reduced to nearly nothing.
The pot might get burnt or just wear out.