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Old 11th October 2013, 06:36 PM   #271
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Quote:
Originally Posted by danielwritesbac View Post
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 7 parallel tda7293 | eBay
The parallel fets give you a more powerful parallel amplifier without ballast resistor losses.
Quote:
Originally Posted by AndrewT View Post
+-40Vdc supply, if regulated, could support a peak output of ~37Vpk into your speaker load.
8 ohms gets to 85W and 4ohms gets to 170W.

If the +-40Vdc sags to +-36Vdc, the maximum peak output will be ~33Vpk.
With 8ohms you get 60W and 120W into 4ohms.

The single pair output stage tends to support the 60W into 8ohms as the only sensible expectation.

Whoever states 400W is lying.

thanks for the reply
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Old 23rd October 2013, 09:27 AM   #272
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Location: Mombasa city
please send me TDA7294 running 50V with power transistors PCB layout
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Old 24th October 2013, 07:24 PM   #273
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Is it possible to run this setup on a 18-0-18 transformer just for testing since I have one around ... Im guessing it is possible. Please excuse as im quite new to building amplifiers. Iv built a tda2030 bridged and a tda1554q(point to point) so far.Also i have ttc5200 and tta1943 that should be no problem ? The specs seem to be the same .

Last edited by joshdsy; 24th October 2013 at 07:45 PM. Reason: added info
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Old 25th October 2013, 01:03 AM   #274
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Quote:
Originally Posted by joshdsy View Post
Is it possible to run this setup on a 18-0-18 transformer just for testing since I have one around ... Im guessing it is possible
It's possible and the output DC voltage after the bridge and the capacitor bank is gonna be around +-25VDC.

Quote:
Originally Posted by joshdsy View Post
Also i have ttc5200 and tta1943 that should be no problem ? The specs seem to be the same .
They're the same as the 2SC5200/2SA1943 pair.

Best regards.
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Old 25th October 2013, 04:09 AM   #275
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Quote:
Originally Posted by sghr220 View Post
It's possible and the output DC voltage after the bridge and the capacitor bank is gonna be around +-25VDC.



They're the same as the 2SC5200/2SA1943 pair.

Best regards.

Thank you for the speedy reply.

I shall post after i build my first channel.

Regards
Joshdsy
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Old 25th October 2013, 02:30 PM   #276
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Quote:
Originally Posted by joshdsy View Post
Thank you for the speedy reply.

I shall post after i build my first channel.

Regards
Joshdsy
You're welcome looking forward to see your project up and running.
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Old 28th October 2013, 01:44 PM   #277
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If i use mica sheets for the ttc5200 and tta1943 and not the tda7294 is that ok as i would have to go to town just to get one mica sheet. I have everything else to start builing the first channel.
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Old 28th October 2013, 03:04 PM   #278
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Quote:
Originally Posted by joshdsy View Post
If i use mica sheets for the ttc5200 and tta1943 and not the tda7294 is that ok as i would have to go to town just to get one mica sheet. I have everything else to start builing the first channel.
Yes you can insulate the transistors only as long as the heatsink is for one channel and no more devices will be attached to it except for the transistor pair and the amplifier.

other possible solutions:

- split the mica sheet with a razor into two thinner insulators (ugly and troublesome).

- use a piece of PTFE tape (plumber tape) covered on both sides with thermal grease (make sure not to puncture the tape with any sharp edges on the heatsink or the IC's).

Best regards.
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Old 28th October 2013, 04:28 PM   #279
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This heat sink is enough for both channels or only one ?
https://dl.dropboxusercontent.com/u/...028_215534.jpg
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Old 28th October 2013, 04:59 PM   #280
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Here is a layout im thinking of using ... i haven't yet soldered.
https://dl.dropboxusercontent.com/u/...028_222520.jpg
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