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Old 25th July 2013, 09:06 PM   #21
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Location: Jackson,michigan
A 28v-0-28V transformer will only give you no more than about 98 watts into an 8 ohm load and that doesn't not include any losses of voltage drop across the output devices and power supply rectifiers.

However bridged amp configuration will allow you to reach your power level goal using those transformers.

You may want to consider something like a BPA-300 using some LM3886's or even some TDA7293's or TDA7294's.

They have a lot of performance per price value!!!

For anything more into 8 ohms you will need to use a higher supply voltage and should consider a discrete version power amplifier or a design that uses TI's LME49810 or LME49830 and some power output transistors.

Paralleled TDA7293's can get you into that power range providing you use a proper higher voltage supply.

FWIW

jer
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Old 25th July 2013, 11:25 PM   #22
wg_ski is offline wg_ski  United States
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Quote:
Originally Posted by geraldfryjr View Post
A 28v-0-28V transformer will only give you no more than about 98 watts into an 8 ohm load
Put the trafos in series. +/-80V-ish, with 40V taps available. Just right for a nice low-heat class H at 250-300W/8R.
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Old 26th July 2013, 01:27 AM   #23
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Quote:
Originally Posted by wg_ski View Post
Put the trafos in series. +/-80V-ish, with 40V taps available. Just right for a nice low-heat class H at 250-300W/8R.
I plan to put them in series, I think the DX DHR circuit was designed with this in mind.
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Old 26th July 2013, 01:42 AM   #24
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Originally Posted by dangus View Post

The ETI 466 amp may be worth considering. ETI-466 Amplifier Technical Review
That looks like a winner. I'm going to give that serious consideration.
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Old 13th August 2013, 01:45 PM   #25
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hey b0b
are you starting to get the feeling that "simple power amp schematics"is a contradiction in terms
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