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Old 19th March 2002, 01:14 PM   #1
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Default class H amp 70w from 12 v battery

http://www.iberfutura.es/PDF/GbPDF/ft326gb.pdf

I find this solution , and I think I will build this circuit for my battery driven amp ,for playing in the street with my bass guitar.

That kind of battery will be best for the application. and I still need info about how to design a charger for the battery, and if posible the charger can be used as a supply for use with wall plug (22ov ac trafo)

any help is wellcome jc.
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Old 20th March 2002, 10:34 AM   #2
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Hello partyjups,
I would use sealed gelcell type lead-acid battery - these are available in different ratings quite easily.
Security alarm systems use these for backup power.
You will need to make a gellcell type charger though.
Also need large bypass capactance - 5000 uF or more.
It is worth going to a metals recycler - they are often pulled out of service due to date, not performance in security systems and just get sold for scrap metal value.
You should be able to find some good ones for only a few Kroner (scrap metal value - good way to buy some cables too!).

Regards, Eric.
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Old 20th March 2002, 12:44 PM   #3
djk is offline djk
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Keep in mind this chip is rated at 45W at 0.5% THD at 4R with 14.4V, with 12V power will drop to about 32W, hope your speaker is 4R. It's also about USD$12 in qty 1, if that matters.
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Old 20th March 2002, 12:49 PM   #4
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Partyjups,

As far as the battery charger is concerned, check out the Maxim website (http://www.maxim-ic.com). They are a semiconductor company that has some wonderful battery charging IC's including design notes. Check out there battery management section and look for battery charger controllers for the type of battery you decide on.

SteveS
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Old 20th March 2002, 01:27 PM   #5
paulb is offline paulb  Canada
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For charging lead-acid, an important consideration is how fast you need to charge it. If overnight is okay, you can probably just float it at a constant voltage. Otherwise, you need something more sophisticated.
I built a charger using a Unitrode (now Texas Instruments) chip; it was fairly straightforward.
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