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My iPod audio amp

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transistor495

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Hi guys,

Here's some pictures of my iPod amp I built a year ago. It's based on a very simple circuit based on Toshiba TA7368P IC which works well at a supply range of 2v-9V providing around 1W max. I used 4 x AA 700mAh rechargeable batteries. Everything built inside a telephone surge protection box and the unit can be charged just like a mobile phone. Charger use LM317.

The driver is an 8Ω,3" full range speaker(Panasonic) that has good over all frequency response. However I used an extra tweeter piezo driver(without parallel coil) inside the assembly box for high frequency clarity..:)
 

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audioguru

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It looks nice but does it sound nice?

The datasheet for the Japanese amplifier IC shows that its output power at clipping into 8 ohms with a 4.8V supply is only 0.18W, not 1W.

A tiny 3" speaker is a tweeter, not a full range speaker. It will not produce bass frequencies.

A piezo tweeter has resonances that makes it sound like a whistle, not like a tweeter.
 

tblo163

New Member
Audioguru.is right (as usual) there is much you can do to improve the sound quality.However I 'm NOT critisising your work.I've built a stereo amp for mp3 playback (at the moment I;m using it to play via the 2 rear speakers in my Volvo)allthough Uncle scrooge(my best friend) doesn't like the TDA 2003 IC,I've used them in my amp.& the sound quality is excellent,plus it does not need a pre-amp.The signal from the mp3 player is more than adequate for satisfactory results.you can populate the components on a small peice of strip board,& use a 2200uF Cap to save space.If you want the circuit let me know. tblo163
 

audioguru

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The TDA2005 or TDA7240A have 3.3 times more output power than a TDA2003 amplifier IC because they are bridged. They are modern car radio amplifiers.
 

transistor495

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Power output is not the key..

It sounds nice as it looks. Not any punching bass but it produces low frequency 'booom' and high notes well. I love its smooth performance.

I have a STK4141 and LA4508 units but now rarely use it.

Made just for hearing while napping when I got irritated by the earphones :)
 

audioguru

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Hi Transistor,
I think you posted some "music" from India. It had no bass frequencies.
Your music is very different from our music. Even the instruments are very different.
 

transistor495

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Hi AG,
It's all depends on particular regions and tastes.

I still play MCMXC a.D through my little iPod amp though. Good for sleep :)
 
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