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Chip Amps Amplifiers based on integrated circuits

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Old 18th December 2011, 01:39 AM   #1
Sparked is offline Sparked  Canada
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Default First DIY :]

Hey everyone,

I'm looking for a portable headphone amp [for my new Senn HD 448!!] and I love building stuff so I figured I'd build one. Never done anything with electronics, but I've done circuits this year at school and I actually quite enjoy it. For the first one I'm more interested in getting a kit and building it and I'm not exactly sure but I saw this one on ebay. Is it any good? Should I get it or no? (Haven't learned op-amps yet, learning it what it is next term.)

Thanks!
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Old 18th December 2011, 02:07 AM   #2
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Hi Sparked, I think you forgot the link Welcome to diy!

Tony.
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Old 18th December 2011, 02:10 AM   #3
Sparked is offline Sparked  Canada
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haha yeah, I realized after I posted but it takes a while for it to show up but thanks again.
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Old 18th December 2011, 02:19 AM   #4
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Sounds like a pretty good offer. Especially the if you can't get it working for any reason send it back with $5 for postage and it will be fixed and sent back! Seller has 100% positive feedback as well.

I'm not familiar with headphone amps so can't comment on the sound quality, but as an intro to diy it sounds like a nice simple project

The only thing that seems a little strange is it says 18V, shows two battery snaps, but only has a single 9V battery in the pics of the completed project.

Tony.
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Old 18th December 2011, 02:21 AM   #5
Francec is offline Francec  Australia
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For only 20 bucks and a guarantee, where is the downside?
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Old 18th December 2011, 02:24 AM   #6
Sparked is offline Sparked  Canada
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okay, thanks guys. is the op-amp okay? i read somewhere that the lf353 is an older model but i really have no idea what they difference between them are. not enough time to research this one cause of exams but i'd really love to make it during the winter break. thanks for the quick response!
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Old 18th December 2011, 02:53 AM   #7
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Regarding one vs two battery connectors, the included opamp should be ok with 1 x 9V, but some other opamps you could put in may need more than 9V, or especially if you were using 7.2V (6-cell) NiMH rechargable 9V form-factor battery, it would be better to use two in series for 14.4V, assuming the included capacitors are rated above 16V (fully charged series of 2 x 7.2V NiMH will peak at 17.4V right out of the charger, also due to this, do not use 2 x 8.4V NiMH with that opamp which has an 18V max rating while they'd be at 20V fully charged.

One thing about this type of mint tin setup is that it's more of a pain to turn the volume knob when you have cables plugged in so close to it on both sides, though 90' plugs help a lot.
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Old 18th December 2011, 03:05 AM   #8
iko is offline iko  Canada
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Listen. You have to start somewhere. If you diy once, I guarantee you that you'll be hooked. Which means that you'll listen to your first project. Then you'll look for something slightly better, and build it. Next thing you know... sorry for your wallet!

Hey, this is one rare little spot where a little bit of happiness CAN be diy-ed. There's almost nothing to lose.
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Old 18th December 2011, 03:15 AM   #9
Sparked is offline Sparked  Canada
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thanks for the help guys, i'll definitely give this one a shot, my friends looking for a cmoy so if this one turns out good but i want to build a better one i can definitely sell it to him. :]

side note:
also, are there any places that have cheap parts? cause the ones that i've looked at from the forum has shipping for like $6? [in other words, is it normally a group buy?] are there places that sell these parts in an actual store?
sorry for the loads of questions, just a big newbie. :]
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Old 18th December 2011, 04:38 AM   #10
scid714 is offline scid714  United States
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Try the cmoy easy to build with good results.
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