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 Forum index » DIY Hardware and Software
Dual Supply, low Wattage amplifier IC
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SineHacker



Joined: Mar 09, 2010
Posts: 98
Location: United Kingdom

PostPosted: Sat Mar 29, 2014 4:16 am    Post subject: Dual Supply, low Wattage amplifier IC Reply with quote  Mark this post and the followings unread

Hello, I am building a project that is running from a dual supply using a pair of 9V batteries. I basically have an oscillator with a couple of functions and I want to drive a vibration speaker http://www.rapidonline.com/pdf/35-0153.pdf

The mini datasheet says the speakers have a rated power of 1 Watt, and the only dual supply power amplifier IC I have found so far (thanks to some help on Muff's) is the TDA2030h which puts out 14 Watt or 8 Watt at 8Ω -

http://www.rapidonline.com/pdf/82-0628e.pdf

I don't know for sure but I am guessing this is a massive problem and the amplifier will probably destroy the driver very quickly.

I want to use a dual supply power amp so the batteries drain more evenly, can anyone help me out with any suggestions here?

I don't really want to do it, but I guess an option would be to use 4 speakers instead of 1?

Many thanks

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aidanrtaylor.co.uk
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stewpye



Joined: Apr 30, 2009
Posts: 49
Location: Brisbane, Australia

PostPosted: Sun Mar 30, 2014 7:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

The TDA2030 has a high quiescent current of typically 40mA. If you're only using a 1W speaker you'd be better off using an LM386N-3 and running it from a single battery. It has a quiescent current of 4mA typical, and would make the amp easier to construct, as it is a DIP package.

Regards,
Stewart.
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