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Old 22nd August 2013, 07:30 PM   #11
Mooly is offline Mooly  United Kingdom
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Originally Posted by KC2ZPK View Post
Ok, bear with me.... I am going to have some questions
I can use Audacity to generate any tone, 1kHZ for this example, 'normalize to 0db' then save that track to my MP3(or other). Now play this track and measure the output with a DVM? But it will be out of the headphone jack, which will be higher than 1v. Could you use an op-amp buffer to set this level? either higher or lower? Line out would probably be better? Can I assume the line outs usually do not have any equalization done to it, such as bass boost?

For some reason I missed seeing your post today. Sorry about that...

So, unless you are using a portable player (because some have tone controls/eq/bass boost etc) then the line and headphone feeds have no equalisation as such. Whatever level you set to record at with Audacity will give the same playback level at any frequency you choose from around 5Hz to 20kHz.

A simple opamp buffer with a preset pot at the input is all that is needed. For 1 volt output the opamp would comfortably run on a single 9 volt supply. 2 volts rms is around 5.6 volts peak to peak, still do-able on a 9 volt supply with the right opamp. To get higher levels would need a higher supply voltage.
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