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Chip Amps Amplifiers based on integrated circuits

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Old 14th March 2013, 05:26 AM   #11
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Good point. I think they meant 12V supply positive and supply negative but it could easily cause confusion. And yes, the chip's datasheet specs aren't very exciting.
The good news (besides the astonishing price) is the included heat sink can probably handle that 1W output.
I admit I'm still wondering what Whi-fi is.

Anyone agree that this thread should probably be moved to the Chip Amp forum?
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Old 14th March 2013, 11:00 PM   #12
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Default Stay tuned

Hi everyone,

I will let you know if this is a thumbs up or thumbs down when it arrives.

I read the Wikipedia article. I still don't think I could tell you the difference between a chip amp and class D. It's beyond my scope right now -- and 56 year old brain maybe.

Tubes, solid state, and "the rest" is how I classify it. I've heard good and bad in all three.

Hope this one is good. And you guys all buy one before they raise the price.

You just never know what cheap and good thing you may happen across. I won't dismiss it with a data sheet. When I hear it, I'll decide then.

Remember, on the bumblebees data sheet. They cannot possibly fly. Theory vs. reality.

Mark
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Old 14th March 2013, 11:33 PM   #13
qusp is offline qusp  Australia
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its a pretty fundamental operational difference. Class D relies on a fixed and hard switching carrier frequency (can be analogue driven free running or driven by a clock) that is much higher in frequency than the audio. a pulse width modulator (PWM) is imposed over this to create the audio. normal A or AB has frequency and amplitude modulation, but no carrier. then there are the technological differences; but it has nothing to do with D standing for digital, because it doesnt, D just comes after C, which came after B which came after A...

yeah the bumblebee thing is a myth that simply wont go away

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Often this bumblebee story is used to discredit scientific conclusions about the impossible nature of supernatural events or feats.

Last edited by qusp; 14th March 2013 at 11:35 PM.
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Old 14th March 2013, 11:44 PM   #14
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Originally Posted by Mark2727 View Post
Remember, on the bumblebees data sheet. They cannot possibly fly. Theory vs. reality.

Mark
Actually it has been proven that they can fly and how. The hypothesis that it has at any time even been discussed in science that they couldn't is inane non-sense as is often the case with urban myths.

There's no "other stuff". There's just tubes and transistors. Class A, AB, D or whatever can be made with either.
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Old 14th March 2013, 11:57 PM   #15
xrk971 is offline xrk971  United States
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Not sure why someone is saying power output is limited to 1 watt? That heatsink looks like at least a 10 watt heatsink. Class AB is about 50% efficient so I would guess closer to 10 watts output.

Off topic but not only can the bumblebee fly, it is scientific fact measured in the lab that as an engine and locomotive system, the bumblebee is super super efficient. Based on calories in honey and distance the bee flies, and converting the calories to energy content equivalent in gasoline... the bumblebee gets 4.7 million miles a gallon!

Here is article on flight of bumblebee and its aerodynamics:
Flight Of The Bumble Bee Is Based More On Brute Force Than Aerodynamic Efficiency

Here is article on fuel efficiency of bumblebee:
Bee Vs. Car: Who Gets More Miles Per Gallon? : Krulwich Wonders... : NPR
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Old 15th March 2013, 12:18 AM   #16
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Default 64 kilometers per bellyfull

Here is article on fuel efficiency of bumblebee:
Bee Vs. Car: Who Gets More Miles Per Gallon? : Krulwich Wonders... : NPR[/QUOTE]


Very cool, X!

Makes my Jetta TDi look like a guzzler!

Mark
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Old 15th March 2013, 12:34 AM   #17
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Originally Posted by xrk971 View Post
Class AB is about 50% efficient so I would guess closer to 10 watts output.
I'd be surprised if you can find a class AB amp that is more than 30% efficient with music signal. The TDA7297 as used here is in fact only 20% efficient like most class AB amp (it's the efficiency at 10% of peak output you need to look at).
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Old 15th March 2013, 09:06 AM   #18
qusp is offline qusp  Australia
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no its not super efficient, well not by insect standards. the first article about bee miles per gallon is for standard honey bees, not bumble bees. Bumblebees as the second article says, have a disconnect between their left and right sides. this feature allows them higher maneuverability in a controlled stall/hover, but means they cannot leverage the energy/efficiency of combined vortices around the body in forward flight. its brute force, the honey bee is much more efficient.

Quote:
Originally Posted by xrk971 View Post
Not sure why someone is saying power output is limited to 1 watt? That heatsink looks like at least a 10 watt heatsink. Class AB is about 50% efficient so I would guess closer to 10 watts output.

Off topic but not only can the bumblebee fly, it is scientific fact measured in the lab that as an engine and locomotive system, the bumblebee is super super efficient. Based on calories in honey and distance the bee flies, and converting the calories to energy content equivalent in gasoline... the bumblebee gets 4.7 million miles a gallon!

Here is article on flight of bumblebee and its aerodynamics:
Flight Of The Bumble Bee Is Based More On Brute Force Than Aerodynamic Efficiency

Here is article on fuel efficiency of bumblebee:
Bee Vs. Car: Who Gets More Miles Per Gallon? : Krulwich Wonders... : NPR
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Old 15th March 2013, 09:13 AM   #19
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I bought one! Thanks for the tip! What the heck!
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Old 15th March 2013, 01:21 PM   #20
gychang is offline gychang  United States
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anyone listen to it yet?
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