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Old 18th January 2013, 10:22 AM   #1
child1 is offline child1  Denmark
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Default 2x30V,225VA toroid in stock... what amp?

Hi all!

I have a toroid (225VA,2x30V) in stock, and I want to build an subwoofer amplifier, but all the chipamps i can find is not able to withstand +/- 42(43)V supply....

Any thoughts on which amp i could build that could use this x-former?


Grats!

Mads, Denmark
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Old 18th January 2013, 10:35 AM   #2
Mooly is online now Mooly  United Kingdom
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LM3886 (at its safe limit really) and the TDA 7293 come to mind. Its a high rail voltage though and lower is often better for reliability. Your better getting a more suitable transformer tbh
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Old 18th January 2013, 10:44 AM   #3
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You can also use TDA7294 without any problems
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Old 18th January 2013, 11:04 AM   #4
Mooly is online now Mooly  United Kingdom
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The TDA 7294 is a rated 100 volts max under no signal conditions. For an 8 ohm load the data sheet specifies 80 volts total as an absolute maximum.
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Old 18th January 2013, 05:07 PM   #5
JMFahey is offline JMFahey  Argentina
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Go discrete for reliable 150W/4r or thereabouts.
An LM3886 won't cut it, and the TDA7294 is *just* on the edge, for an 8 ohms load.
I'm not a fan *at all* of parallel chipamps.
A subwoofer amp is an "easy" one.
Who needs 0.0001% distortion/high slew rate/500 KHz bandwith/class A/whatever there?
Any simple raw power amp will do.
Tons of projects, even here at DIY.
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Old 18th January 2013, 05:29 PM   #6
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TDA7293 parallel will work with this transformer.
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Old 19th January 2013, 03:29 AM   #7
JMFahey is offline JMFahey  Argentina
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The point of life is to build atleast one audio amplifier before you die.
Then I should have died 10000 times by now
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