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Old 16th March 2012, 11:16 PM   #41
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Yes,That is RMS.
A bridged amp could get you 242 watts RMS into 8 ohms with 22v transformer.
But typically less when you consider the semiconductor and resistor losses, But still that is a good chunk of power!

jer
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Old 17th March 2012, 05:16 PM   #42
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Right that all does sound Perfect too me =)

I was thinking of just bridging a plain pair of TDA7294's for these transformers for 100 rms 200 max

Im 100% going to pay the little extra to get that power =)

I have 2 of these transformers lieing around

Perfect power for my Midtops =)
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Old 17th March 2012, 11:17 PM   #43
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always nice to have things laying around, and you also have an upgrade step when you decide to get a higher voltage transformer.
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Old 16th April 2012, 10:41 PM   #44
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Thanks for this thread!

I made a PCB for the class H application of the TDA7294 including a batch of custom wound 2x15/2x30V 300VA transformers in the mid 90's.
It never worked properly, one blew up and fried the subwoofer it was in

I recently got rid of most transformers and bought some Chinese PCB's to finally use my TDA7294 chips, and only now I find this simple solution The intended power of what I was aiming for, but a much simpler design

I'll reserve one chip and one transformer for this amp! Then I can finally finish my active sub after 15+ years

Edit: I bought one chinese BTL stereo board (4 chips), so if calculating correctly with 1kW of single output 48VAC transformers lying around, I should get over 2x400Wrms@4ohms (too little transformerpower, but won't be using it all to often...). Plenty for my 350Wrms Aliantes that I want to convert for homeuse...

Last edited by ric-paul; 16th April 2012 at 11:09 PM.
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Old 18th August 2012, 07:33 PM   #45
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Question TDA7294-IRFP240/IRFP9240 Audio Amplifier schematics!?

Hi guys!
Very interesting audio amplifier with TDA7294 and BIPOLAR transistors 2SC5200/2SC1943. But I want to making this amplifier with MOSFET transistors IRFP240/IRF9240 and IC = TDA7294, because I want to ask how to make a schematics (circuit)?!
Thanks for your help and cheers!
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Old 18th August 2012, 07:49 PM   #46
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Question TDA7294-IRFP240/IRFP9240 Audio Amplifier schematics!?

People look forward to your help with schematics,...
Thanks !

Last edited by formula 22; 18th August 2012 at 08:15 PM.
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Old 21st August 2012, 11:37 AM   #47
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Hi
If i want use this amp for 500w in 2 ohm load, how meny voltage and amper i need?
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Old 21st August 2012, 11:40 AM   #48
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Please offer to people a protection shematic for over current, output dc, output short and thermal for it
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Old 21st August 2012, 04:15 PM   #49
johnr66 is offline johnr66  United States
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With the bases of the output devices tied together, this is class B, however being inside the NF loop, the outputs are fed a "corrective" signal to make the crossover point linear. I'm going to build this and have fun with the oscilloscope. I still wonder how clean the output is at very low levels. Should be an interesting experiment.
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Old 21st August 2012, 08:06 PM   #50
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Quote:
Originally Posted by johnr66 View Post
With the bases of the output devices tied together, this is class B, however being inside the NF loop, the outputs are fed a "corrective" signal to make the crossover point linear. I'm going to build this and have fun with the oscilloscope. I still wonder how clean the output is at very low levels. Should be an interesting experiment.
Johnr66 I agree with you that experiment and make some measurements for this amplifier. But I consider that this schematic would look like amplifiers with output MOSFETs irfp240/irfp9240?
Cheers!
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