Portable Mp3 player speaker amp
Hi I've been working on a portable speaker system for my mp3 player and up to this point have been using old computer speaker amplifiers to little success.
I came across Gainclone amps and was wondering if this would be a practical application.
Weight is a minor issue as it already is rather large and and extra few pounds wouldnt matter.
Would it be possible to power the amplifier through a battery supply?
Also what sort of footprint do these amps usually have?
Is there any online store which sells all the part neccessary for construction for a reasonable price?
Thanks for any help you can provide.
How much power do you think you will want? if you are looking for battery power, this sounds like an application for a class D amp due to the efficiency.
Also, I have heard of people driving Sonic Impact amps via 12V batteries to good effect. Buying that amp as a module and ripping the guts out to use in your portable system would get you a more efficient amplifier than most any chipamp solution.
That looks perfect. thanks for the help.
Yes, check out the Class D forums, and especially look for the Tripath-based designs.
These offer superb sound for a portable device and are 80%+ efficient and run great on widely available 12 v. batteries. You can buy a Sonic Impact and rip it apart (and upgrade the input and power caps), buy a preassembled board, or build from a kit.
There are two flavors of the 12v Tripath chips: the 2024, which has a 15 wpc into 4 ohms spec, and the 2020/2021B, which offers 25 wpc. You'll get better battery life with the former, but slightly more sound from the latter.
I suggest you look at the kits at 41hz.com, especially the Amp 6, and if you're a killer solderer, the amp 32. Prices are very good, and in my experience, the sound beats the pants off even a well-modded Sonic Impact.
Excellent advice there Buck. I put a Amp32 in a small Ratshack project box and use a external 8 AA battery holder for the 12v.
I take it backpacking with me and it's great to have tunes 50 miles away from nowhere.
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