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Old 30th November 2003, 03:10 PM   #1
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Question TDA729X paralel/bridge project

Hi! I'm newbie here from Hungary. I would like to talk about TDA7293 or 7294S. I like to build paralel/bridge amp with these chips, but I'm not sure which the best one. If somebody tested, please tell me about. Which one have the best sound, best stability, how much the max output power, how much the max +-Vs. On the datasheet why no 22uF capacitor serial with 680 ohm resistor when bridged (on pin #2)? Can I connect stabilized 24V to the pin #5 (via resistor) for clipping led?
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Old 26th December 2003, 04:25 PM   #2
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Now I have a plan for this idea:

http://rentahost.net/stratofan/pdf/S...TDA_Br_Par.PDF

I would like to use pin5 of 7293 (clip detector). Is my plan is good on schematic with 24V and 4.7K resistors? Not exactly clear how do I mean "RL=10Kohm to 5V" about clip detector on the datasheet of 7293 (page 3).

Another question, on the datasheet of 7294S the - + inputs of slave IC vired to the 0V (page 10), but on the datasheet of 7293 vired these inputs to the -Vs (page 10). I think the 7294S datasheet is better for parallel...

If somebody think how better, please tell me!
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Old 27th December 2003, 07:43 AM   #3
Dxvideo is offline Dxvideo  Turkey
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On the schematic I saw 400W x 2... Does it really give that power? Two TDA7493 in parallel in ST's datasheet is available but output power doesnt given.
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Old 27th December 2003, 08:08 AM   #4
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I'm not sure about output power yet. I think with four 7293 I gan get about 350-400W/channel. Marshall Mode Four is same config for 350W. On bridge, the ST datasheet said 150W on 8 Ohm +-25Vs, and 170W on 16 Ohm +-35Vs. I think I can do double power with parallel mode on half speaker impedance.
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Old 27th December 2003, 08:30 AM   #5
Dxvideo is offline Dxvideo  Turkey
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I guess, parallel mode gives 200W to 4 ohm load with two devices. However, as I heard before, we cannot apply four devices in parallel for TDA74xx. But its possible to apply two parallel devices in bridge.
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Old 27th December 2003, 09:25 AM   #6
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Yes, I heard same. If true what I heard, max three devices can be connected to parallel (one of them master, two slaves). But the speaker impedance must be lower if I want to get more power in parallel mode.

Somebody else have opinion about the schamatic? I looking for schamatic of PWM fan speed controller depending on the heat of heatshink.
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Old 27th December 2003, 10:54 AM   #7
Dxvideo is offline Dxvideo  Turkey
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It's not PWM but it works fine (I tried). I hope it helps u... All diodes 1N4004.

Note: diodes have to attached to the same heatsink with output transistors/ics...
Attached Images
File Type: gif p42-fig1.gif (5.1 KB, 1965 views)
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Old 27th December 2003, 12:32 PM   #8
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Thank you! This is really simple. Is this switch on/off the fan, or controll the speed up/down if required?
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Old 27th December 2003, 12:54 PM   #9
Nisbeth is offline Nisbeth  Denmark
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StratoFan, if you can read German,have a look at this:
http://www.ub-audio.com/produkte/a100.htm
The datasheet for this design has lots of great info on the TDA7293



/U.
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Old 27th December 2003, 01:05 PM   #10
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Nisbeth sorry I can't understand these pages

Dxvideo, as I see the circuit switch on/off the fan. I found a simple motor speed controller here:

Click the image to open in full size.

I think will better I have to try this with thermoresistor
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