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Step 25It is complete
The headphone amplifier is complete, and it works.
The chip I used has a gain of 2 so it needs line levels (around a volt rms) in order to work.
With no signal, the current drawn from the battery was about 2 milliamperes. With the music blasting at a comfortable volume in the earphones shown the current went up to around 12 milliamps.
I should wrap it up in duck tape to make it look nicer, but it looks like the junk it was made from.
I shall try building it into a marker pen body the next time I get the urge to make one.
The chip I used has a gain of 2 so it needs line levels (around a volt rms) in order to work.
With no signal, the current drawn from the battery was about 2 milliamperes. With the music blasting at a comfortable volume in the earphones shown the current went up to around 12 milliamps.
I should wrap it up in duck tape to make it look nicer, but it looks like the junk it was made from.
I shall try building it into a marker pen body the next time I get the urge to make one.
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Feb 19, 2009. 6:10 AMBondo
says:
What a swell instructable! The combination of high-tech electronics, low-tech tools and materials, and funky craftsmanship is great. A great instructable for a novice like me. Thanks for sharing this info!
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