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Final year of what?
Software for what? Windows? MACOS?
Most audio (wave) edit programs offer that feature.
Search for wave editor.
Goldwave, etc. I use CoolEdit v1.2.
Your soundcard will only put out line level.
A simple power amp attached to a sound card output just about any sine wave you want, but no DC offset, sound cards outputs are nigh universally capacitor decoupled.
The sound card will only directly output about 2V peek to peek directly, and VERY little power. You need an amplifier to get more than that, a decent set of PC speaker amplifiers would do.
So you want the bluetooth headset to output 5V's is THAT what you're asking?
The output of a bluetooth headset is probably at most puting out a couple of volts. You'd need to amplifier it from the bluetooth headset. What is the point of all this?
Yes, any speaker amplifier capable of 2-5 watts of output power should do depending on what you're trying to drive with it.
Is it ok to use a LM386?
As already mentioned, it depends what you're trying to drive, and how loud you want it - an LM386 is a VERY small power amplifier.