Please help about the minimum VA of transformer to drive TDA7293 - Page 2

Juergen Knoop · 16th July 2007, 04:27 PM

I'm not shure, of course I wouldn't expect any other reason than help

goldkenn · 17th July 2007, 09:01 PM

Then how about parallel 2 x TDA7293 for one channal with the same transformer? Since add one more amp PCB still far much cehaper then buy a new transformer or speakers....... but as told before, I have 2 transformers in hand both rated at 150VA / 25 x 2, will 150VA enough for parallel 2 x TDA7293 per channal?

Juergen Knoop · 18th July 2007, 02:26 AM

all the power from the transformer must be heatsinked in the amplifier and dissipated in speakers voicecoil
your suggested case is small, heatsinks probably too and I don't know what your bookshelf speakers can withstand
therefore there is little to gain from more transformer wattage
try one transformer for stereo, you already have it!

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16th July 2007, 04:27 PM	#11
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	I'm not shure, of course I wouldn't expect any other reason than help

17th July 2007, 09:01 PM	#12
goldkenn diyAudio Member Join Date: May 2005 Location: HK	Then how about parallel 2 x TDA7293 for one channal with the same transformer? Since add one more amp PCB still far much cehaper then buy a new transformer or speakers....... but as told before, I have 2 transformers in hand both rated at 150VA / 25 x 2, will 150VA enough for parallel 2 x TDA7293 per channal?

18th July 2007, 02:26 AM	#13
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	all the power from the transformer must be heatsinked in the amplifier and dissipated in speakers voicecoil your suggested case is small, heatsinks probably too and I don't know what your bookshelf speakers can withstand therefore there is little to gain from more transformer wattage try one transformer for stereo, you already have it!

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