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child1 18th January 2013 11:22 AM

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?


Mads, Denmark

Mooly 18th January 2013 11:35 AM

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

aadrian 18th January 2013 11:44 AM

You can also use TDA7294 without any problems

Mooly 18th January 2013 12:04 PM

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.

JMFahey 18th January 2013 06:07 PM

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.

Tekko 18th January 2013 06:29 PM

TDA7293 parallel will work with this transformer.

JMFahey 19th January 2013 04:29 AM


The point of life is to build atleast one audio amplifier before you die.
Then I should have died 10000 times by now :p

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