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TDA7294 + Power Transistors AMP (TDA7293 to come also)
TDA7294 + Power Transistors AMP (TDA7293 to come also)
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Old 19th March 2017, 03:47 PM   #621
dr frost dk is offline dr frost dk  Denmark
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Join Date: Feb 2012
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f-ing dropbox changed their public folder system so now 10,000' posts in this forum are dead, i cannot add attachments to post #1 and thereby not fix the missing images.
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Old 19th March 2017, 04:56 PM   #622
Thabto is offline Thabto  Italy
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Quote:
Originally Posted by dr frost dk View Post
f-ing dropbox changed their public folder system so now 10,000' posts in this forum are dead, i cannot add attachments to post #1 and thereby not fix the missing images.
I get that. Unfortunate situation. Do you somehow have any data on this project stashed away somewhere? Please let me have it, I will provide my email. Let me know
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Old 19th March 2017, 05:19 PM   #623
dr frost dk is offline dr frost dk  Denmark
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All data is in this thread, but now missing a lot of pictures
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Old 20th March 2017, 04:47 PM   #624
dr frost dk is offline dr frost dk  Denmark
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Join Date: Feb 2012
Location: Frederikshavn, Denmark
I was asked to post my home AMP from a fellow user on talk.maemo.org so here it is

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:
TDA7294 + Power Transistors AMP (TDA7293 to come also)-tda7294-npn_pnp-schematic-png
NOTE: 6.8Ohm resistor is a 5W

Hole Print "Design": (Would like to make proper boards...)
TDA7294 + Power Transistors AMP (TDA7293 to come also)-tda7294-hole-print-png

Pictures:
TDA7294 + Power Transistors AMP (TDA7293 to come also)-07042010048-jpg

TDA7294 + Power Transistors AMP (TDA7293 to come also)-20100816121-jpg

TDA7294 + Power Transistors AMP (TDA7293 to come also)-20100816123-jpg

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...

Test Results on this AMP done by zanden30 and cmorariu can be found here and some pages forward.

EDIT: 2014.03 - Now also on facebook https://www.facebook.com/groups/760434413975466/
EDIT: 2017.03 - Im still using this amplifier, i have used it now for about 10 years with no problems, it is on for minimum 12 hours a day and have been for years
Attached Images
File Type: png TDA7294 NPN_PNP Schematic.png (24.3 KB, 2044 views)
File Type: png TDA7294 Hole Print.png (6.7 KB, 1986 views)
File Type: jpg 07042010048.jpg (54.9 KB, 1986 views)
File Type: jpg 20100816121.jpg (61.6 KB, 1897 views)
File Type: jpg 20100816123.jpg (129.4 KB, 1868 views)

Last edited by dr frost dk; 20th March 2017 at 04:53 PM.
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Old 20th March 2017, 04:53 PM   #625
Thabto is offline Thabto  Italy
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Thanks @ dr frost dk
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Old 20th March 2017, 11:08 PM   #626
sesebe is offline sesebe  Romania
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How you calculate or measured the power?
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Old 11th April 2017, 06:16 AM   #627
Mayday is offline Mayday  Sweden
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Location: Sweden
TDA7294 + Power Transistors AMP (TDA7293 to come also)
What, if anything, would need to be changed to make this work with TDA7293?
I have the OPT devices, Fairchild not Toshiba, and the rest apart from maybe a resistor or two.
Transformer I'm planning on using is 500VA 2x24VAC toroidal.
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My blog, go have a look
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Old 11th April 2017, 12:40 PM   #628
dr frost dk is offline dr frost dk  Denmark
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Join Date: Feb 2012
Location: Frederikshavn, Denmark
TDA7293:
TDA7294 + Power Transistors AMP (TDA7293 to come also)-tda7293-npn_pnp-schematic-jpg
Attached Images
File Type: jpg TDA7293 NPN_PNP Schematic.JPG (48.2 KB, 1894 views)
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Old 14th April 2017, 02:04 AM   #629
jayd99 is offline jayd99
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whats the power supply specifications please? Thank you
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Old 14th April 2017, 02:43 AM   #630
jayd99 is offline jayd99
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Also I have pins 9&10 connected directly to +vs from previous configuration, can it still work or is it required to connect the caps and resistors? Thank you
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