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Old 26th February 2011, 05:16 AM   #1
Einric is offline Einric  United States
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Default TDA7294 in BTL

I'm looking at building a 2*TDA7294 BTL 2ch amp from an ebay kit. The kit is rated at 150w * 2. I am however going to configure it in a monoblock Bi-Amp style. I only want each BTL pair to put out 62.5w ish. with a Bi-Amp total of 125w @ 8 ohm. If the experiment is successful I will be driving a pair of Totem Rainmakers and I will build a second amp. The whole purpose of this neutering this amp is to be able to run cool at maximum output all day long with minimal distortion.
What Toroid voltage should I use to get my desired output, 12-0-12?

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Old 26th February 2011, 05:46 AM   #2
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12V secondaries will only give 18V DC off-load assuming 10% regulation. For 62.5W into 8R you need a peak output of 32V. I'd go for 15V secondaries myself as the amps won't swing much closer than 3V from the rails.
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Old 26th February 2011, 05:49 AM   #3
Einric is offline Einric  United States
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Default 15V Secondaries

After I posted I just started to look into 15v Toroids. Would you happen to know how to connect a dual secondary to a single Bridge Rectifier for the 15-0-15 that I need.
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Old 26th February 2011, 06:22 AM   #4
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Would you happen to know how to connect a dual secondary to a single Bridge Rectifier for the 15-0-15 that I need.
Click the image to open in full size.

You want to run the amp all day long at maximum output? Distortion won't be an issue for you then. Hearing protection will be.
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Old 26th February 2011, 02:38 PM   #5
Einric is offline Einric  United States
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So, on my PCB I have a three screw terminal for VAC. If I take the 26 from the first secondary, 0 from the second, then connect the 0 & the 26 leftover to ground, what do I connect to the 0 part of the terminal strip? Just tie that to chassis ground? Correct?

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