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Old 6th January 2013, 05:39 PM   #11
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Originally Posted by PROFESSOUR2003 View Post
DIY Audio 300 Watt IC TDA7294 Chip Power Amplifier Circuit for Home Stereo or Subwoofer
TAKE A LOOK THEY USE 4 OHM SPEAKER WITH TDA7294 IN BRIDGE MODE THEY SAY IT`S 300WATT..!!!!!!
Hi. It would be possible to design an amplifier which delivers 300 Watts RMS into 4 Ohm load using the TDA7294. It would need 4 x TDA7294 in bridged/parallel mode. The power supply voltages would need lowering and/or a current limiting resistor would need to be added to the output of each IC to prevent it from pushing out more current than it is designed to do.
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Old 8th January 2013, 10:12 PM   #12
JMFahey is offline JMFahey  Argentina
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It is possible, Marshall did in their MF350 guitar amp.
The amps burn so often that they had to offer a plug-in module so Musicians can repair them at home, that model stopped being carried by Music Shops because they did not want to deal with customer anger, and was quickly discontinued.
Pro Techs also avoid servicing them.
Go for any tried and true schematic, you'll find a few even here at DIY.
Does that answer your doubt?
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Old 8th January 2013, 10:17 PM   #13
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i cant reach the website linked in the first post it brings me to time warner cable search help?
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Old 9th January 2013, 12:22 AM   #14
JMFahey is offline JMFahey  Argentina
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Quote:
i cant reach the website linked in the first post
It's a 2010 link, no longer valid.

Quote:
it brings me to time warner cable search
Maybe they hacked your PC, the correct answer should be "page not found" or similar.
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Old 9th January 2013, 09:49 PM   #15
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My internet service provider is time warner cable does that have to do with anything?
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Old 10th January 2013, 02:01 AM   #16
JMFahey is offline JMFahey  Argentina
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Originally Posted by realflow100 View Post
My internet service provider is time warner cable does that have to do with anything?
Don't know, you mentioned it.
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Old 10th January 2013, 02:34 AM   #17
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Quote:
Originally Posted by PROFESSOUR2003 View Post
DIY Audio 300 Watt IC TDA7294 Chip Power Amplifier Circuit for Home Stereo or Subwoofer
TAKE A LOOK THEY USE 4 OHM SPEAKER WITH TDA7294 IN BRIDGE MODE THEY SAY IT`S 300WATT..!!!!!!
I would forget the chip amps and go for a proper class AB amplifier which is rated for high power.
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Old 10th January 2013, 02:40 AM   #18
JMFahey is offline JMFahey  Argentina
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Agree. Same here.
Besides, chipamps are great for providing a simple solution, fine.
But with 4 15 leg chipamps, you are reaching 60 pins total, just for them , plus auxiliary elements.
When proper robust versatile discrete amps become simpler than the unflexible chipamp solution, then chipamps lose a lot of their attraction.
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Old 14th September 2016, 02:45 AM   #19
abys is offline abys  India
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Default Max.mum voltage??

Hi, friends,

I was following your discussions and would like to ask few doubts. In the TDA7294 datasheet, when it comes to the bridged section, it is given that
Quote:
with Rl= 8 Ohm, Vs = 25V the maximum output power obtainable is 150 W, while with Rl=16Ohm, Vs = 35V the maximum Pout is 170 W.
When I looked into many circuits that are available for purchase, it was seen that most people restrict the voltage to a low value at bridging level.

Based on the above, I am getting confused on whether there is any restriction on the maximum voltage of the bridged circuit. My wish is to run bridged circuits (with 4 ics - 2 ics for left and 2 for right) for stereo applications, at 150 watts+ 150 watts, 8 ohms loads and 38+,0, 38- dual DC power supply. I know its a bit near the limit but I have run the non-bridged stereo version on a 2.1 amplifier at 38 volts dual DC. It is working fine. But, when it comes to bridging, I am still in doubt in implementing at that voltage.

If it proves to be a problem, I am planning to shift to TDA7293. Also, I would like to know if its ok to use 0805 package resistors for the resistors for TDA7294.

Last edited by abys; 14th September 2016 at 02:48 AM.
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Old 14th September 2016, 04:23 AM   #20
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If you bridge your stereo amp and use the same 8 ohm speaker, the voltage and current are both doubled giving you four times the power.
The voltage is only a problem if you touch the terminals (2xrailvoltage). The problem is that each amp and its PSU are expected to supply double the current.
To do this correctly, you should design the amps for 4 ohm use. This normally means replacing the PSU and transformer.
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