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Old 27th January 2006, 03:11 PM   #1
palesha is offline palesha  India
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Default 200W @8 ohms circuit

I want to make one 200W @ 8ohms Class AB for 2 way active PA speaker system. I want to use another 50W@8ohms for tweeter. The amplifier must be rugged. Suggest some good circuits.
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Old 27th January 2006, 03:51 PM   #2
lineup is offline lineup  Sweden
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200 Watt in 8 Ohm = +-56.6 Volt peak
(gives >7A peak currents, 56.6V/8 Ohm)

For one channel, mono:
Power Supply = 2x 60-65 Volt DC with 15-20 Ampere bridge rectifier.

Suitable transformers, you need two of these, can be: 2x45V and 500VA
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Old 27th January 2006, 10:05 PM   #3
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For the 200W@8Ohms amplifier have a look at the Ampslab C300:
http://www.ampslab.com/c300.htm
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Old 28th January 2006, 11:29 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
I would go for the ESP 300W design and reduce the transformer voltage to match your power requirement.
I think it's P101 you need not the sub-bass amp; http://sound.westhost.com/projects.htm
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