DIY AMP Three parallel LM3886 power amplifier board 150W Current fever #868 - Page 3 - diyAudio
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Old 29th May 2012, 11:10 AM   #21
syklab is offline syklab  Hong Kong
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Oh,
Sorry, I was referring to the first picture on the amp module in post #1 (left most one).

Best regards
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Old 29th May 2012, 11:14 AM   #22
AndrewT is offline AndrewT  Scotland
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There is no specification associated with that leftmost pic.
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Old 29th May 2012, 11:21 AM   #23
syklab is offline syklab  Hong Kong
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DIY AMP Three parallel LM3886 power amplifier board 150W Current fever #868-in Amplifier from Consumer Electronics on Aliexpress.com

The above link was mentioned in the post and this referring to the amp module that was shown from left most and the middle one so I assume the spec listed by the site is for the module shown in the picture.

Best regards

Last edited by syklab; 29th May 2012 at 11:26 AM.
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Old 29th May 2012, 11:33 AM   #24
AndrewT is offline AndrewT  Scotland
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That description in the link is riddled with errors. Can you rely on a retailer that obviously knows next to nothing about the product?

Now to the 150W claim.
What impedance is that into?
The description does not say.

I will guess from my experience that they mean 4r0. But that does not guarantee that the amplifier can drive a 4ohms speaker.

However I will guess even deeper into my experience and suggest that a 3 device paralleled chipamp can indeed drive a moderate reactance 4ohms speaker.
Assuming I have guessed correctly and that the product has been designed to achieve ~120W into 4r0, not 150W. then you can use this amplifier in a bridged arrangement.

Remember the doubled power into twice the impedance rule.
A pair of these amplifiers, if designed properly, will deliver ~240W into 8r0 and should be capable of driving a moderate reactance 8ohms speaker.

Note, nowhere have I, nor the description mentioned 2r0, nor 2ohms.
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Old 29th May 2012, 11:51 AM   #25
syklab is offline syklab  Hong Kong
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Andrew,

Thanks
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