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Old 22nd August 2012, 10:30 AM   #51
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Some body answer yo my question plz?
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Old 23rd August 2012, 06:51 AM   #52
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The voltage is limited due to the TDA7293's limitations--see the datasheet. The transformer can be va 1.5x watts (from 500va to 750 va for 500 watt amplifier). Current handling may take about 4 pairs of output devices per each chip.

The current of TDA7293 can also be boosted with a multi-parallel arrangement using the slave pin http://www.ebay.com/sch/i.html?_nkw=...7293&_osacat=0
The parallel fets give you a more powerful parallel amplifier without ballast resistor losses.
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Last edited by danielwritesbac; 23rd August 2012 at 06:59 AM.
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Old 23rd August 2012, 08:15 AM   #53
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thanks
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Old 22nd September 2012, 06:17 PM   #54
Anuj is offline Anuj  India
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Hello ...i m a newbie here...n intrested to build thir amp.. But the only problem are the power transistors. I cannot get these from my nearby shop. Can i use differnt transistors? If i can ,can u tell me which is it...? May be smthhng like irfp9xxx...,?
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Old 26th September 2012, 04:48 AM   #55
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U can use 3055 and mj2955 but not irfp.... as they r mosfets.

Gajanan Phadte
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Old 26th September 2012, 09:18 AM   #56
Anuj is offline Anuj  India
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Thanks for the help Gajanan. Soon i will make this amplifier......
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Old 24th October 2012, 11:36 PM   #57
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Default I did this audio amp and worked great!

I just discovered this page and the info of this amp with two out put transistors that I decided to make it. I did it and worked great. In has great power and quality sound! I have some pics and they are here.I did the board and I added a preamp. I have not tested the preamp just the amp. and I very satisfied with the power and sound. MUY BUENO.

This is the classic TDA7294 AMP with LOTS more Power then normal, this is with using Power Transistors at the output stage, it is a simple Addon to make, it just requires a SYNC resistor and the feedback to be moved to the output after the Power Transistors.
So to make this AMP you can just start with the TDA7294 with one change, just need to "move" the feedback so you can connect it to the Output after the Power Transistors, in all the AMPS i have made with the TDA7294 the 6.8Ohm has been spot on when using the 2SC5200 & 2SA1943, if you use other transistors you may need to experiment with another value for the SYNC resistor.
Things to do when SYNC it is to listen to it, things to listen to are from very low volume (FROM a clean source) and go slowely up in volume, the POINT here is that it should just get louder like a normal amplifier would, if the SYNC is off then a normal thing will be that at audio peaks (like drums & bass) it will sound like someone is kicking your speakers because the Transistors kick in at a wrong volume then the amp is playing, believe me you will hear it, this needs to be corrected by changing the resistor else you will have an amp that only sounds good at very low volume and medium to high volume.

Component list: (1x AMP)
1x 680 (680R) Resistor
1x 10K Resistor
3x 22K Resistor
1x 6.8 (6R8) 5W Resistor
2x 0.15 (0R15) 5W Resistor
2x 10uF 50V Capacitor
2x 22uF 50V Capacitor
1x 1uF 63V MKT/BiPolar Capacitor
1x TDA7294 Chip AMP
1x 2SA1943 PNP Transistor
1x 2SC5200 NPN Transistor

Schematic:
Click the image to open in full size.
NOTE: 6.8Ohm resistor is a 5W

Hole Print "Design": (Would like to make proper boards...)
Click the image to open in full size.

Pictures:
Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

STATS:
Output Power: well lets just say that speakers that where 250/500W 2Ohm (RMS/MAX) where played to the max with NO DISTORTION AT ALL
I will call the output at 400W+ (MAX) and this is based on that the TDA itself adds ONLY 20-40W (because of the much higher driving Ohm), but the 5200/1943 are some GOOD POWERFULL transistors and going through the datasheet it will deliver peeks over 600W (short pulse pr Transistor), they supply 100W but this is FULL DC and there are no audio tracks to my knowledge that has that kind of "sound"
Driving Impedance: i have been using it for 2-8Ohm speakers, the lowest i have driven was 1.3Ohm but as with all AMPS if you know your Transistors you know how many watts you can pull out, this AMP will drive what ever you hook it up to, JUST one thing, when i was using my 1.3Ohm set it did introduce some "noise" (sounded like 80' AMP hiss), and at this point the SYNC resistor properly needs to be changed, i did not do this, i took the lazy way out and put some 1.8Ohm POWER Resistors in line with the speakers instead.

I have been using this AMP for +3 years, it is good for driving 2-8Ohm speakers with current config (6.8Ohm RES & 5200/1943)
The only thing i can really say is BUILD it, you will not be disappointed i can guaranty that, as long as you follow the "guide" it will be fine, i will how ever RECOMMEND that you use the same components (5200/1943) then you should not go wrong and it will play beautiful the first time it is hooked up, and also with these components it is VERY cheap to make (depending on suppler), where i buy my components i can make 1 channel (All components) for about 15$, it is as always the POWER SUPPLY that is going to set the price back.


Link to the original Thread DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...) - maemo.org - Talk

Whats more to come, well more "stats", and the new AMP im building right now, it's the TDA7293 With Power Transistors x 4, for a nice POWERFULL BI-AMP system, but it can also be used as a 4.0 Surround AMP or a Bridged 2x 700W+, also more pictures etc.

This post will be updated again and again to meet questions and to add pictures, guides etc...[/QUOTE]
Attached Images
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Old 25th October 2012, 07:30 AM   #58
astx is online now astx  Austria
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A better approach IMHO would be - see Figure 2 from AN18f.pdf

http://www.linear.com/docs/4114

Implemented is also a overcurrent protection.

Regards,
Toni
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Old 31st October 2012, 03:38 PM   #59
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Glad you like it juanj54c, was easy to make right?

Also an update, i have yet to complete the TDA7393..... i know it has been a loooong time since i posted but really been busy with lots of other projects and just moved so now everything is not where it should be...., can't say when im done, but the 7393 worked like 94 with the output transistors.

There are alot of future projects that have more attention right now, but someday ill update.

How else then juanj54c has made this amp?


dr_frost_dk out.
^^ google if you want a summery of other projects hehe
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Old 7th November 2012, 09:23 PM   #60
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I'm planing to make this amp but with 2x5200/1943. Also i'm going to drive 8Ohm speaker.
What power should i expect?
Power supply will be almost the same as dr frost dk's
P.s. made a scheme using eagle (i hope no mistakes are made there ) tda7294.zip
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