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Chip Amps Amplifiers based on integrated circuits

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Old 6th June 2013, 08:10 PM   #11
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You've got the right idea.

If you replace the transformer, better replace the heatsink too.

Is there a schematic you could post?
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Old 6th June 2013, 09:24 PM   #12
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If the amp sounds anything like this character:

T2EGpSXaxbXXXXXXXX_!!38676472.jpg

we're in for a treat!



PS How good are your eyes?

T1cvRXXbdenIDZK5jb_124358.jpg

Last edited by AudioLapDance; 6th June 2013 at 09:29 PM.
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Old 6th June 2013, 09:57 PM   #13
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From what I can see of the schematic, it uses a dual rail power supply. That would put the heat sink at the minus rail unless an insulating washer is used.
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Old 6th June 2013, 10:22 PM   #14
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Quote:
Originally Posted by Fast Eddie D View Post
No freakin way are they selling a McIntosh for $25. If so I would buy a hundred of them and flip them for $500 apiece (keep a couple for myself ).

I agree that some of their kits are stellar bargains. The amplifier shown is worth the price for the case and knobs alone. With a litlle spray paint it would look great.
Its weight is just 11 g. I think what they sell is a photo.
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Old 7th June 2013, 01:28 AM   #15
Lo_Tse is offline Lo_Tse  Canada
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Originally Posted by activexp View Post
Many parts are junky, the heatsink is a piece of very thin box section, probably adequate though. The case itself is also very thin sheet and easily bent but again it does the job. I expected a black case but smalltao e-mailed me to say that black was sold out and was gray OK. Well yes but in reality it's cream! I have already applied black vinyl 'veneer' and with any luck it might look quite smart

Click the image to open in full size.

What is slightly weird is the oversize cut-out for the on/off switch. I've had to make a mounting plate for it.

Yeah, the transformer is puny and I'll consider something better if the amp actually works.

Looking at the circuit diagram, some components have been downgraded. The smoothing caps are shown as 4700uF but you get 3300uF in the kit. There may be other downgrades I haven't spotted yet.

At the end of the day it's something cheap and cheerful to tinker with rather than a serious piece of kit so my expectations aren't high.

IMHO, at the price you paid, just can't beat it. Yes, the components look cheap and some of them might be fake. For newbie like me, this is a perfect learning piece. I look at this as a chance to improve my soldering and assembling skills. One can also practice how to inspect the assembled piece i.e. correct voltages and currents at different parts of the circuit. At the end, if it actually sounds OK. it is a bonus.

Have fun!

Regards,
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Old 7th June 2013, 09:27 AM   #16
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Here's the schematic...........

Click the image to open in full size.
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Old 7th June 2013, 02:12 PM   #17
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Thanks for the schematic. There is nothing remarkable about it.

The schematic does not indicate any provisions for noise ground vs power ground. Does the circuit board at least have a decent ground scheme?

When I design audio circuits, I provide a noise ground that is decoupled from the power ground by a 10 ohm resistor. But if I use it with commercial equipment that has no such provision, whether it is a commercial CD player, preamp, or power amp, my efforts have been at least partially negated.

This seems to follow the consumer grade mantra that ground is ground. Since we design and build our own stuff here, we can do so much better than that. Cheap and simple tweaks can make a huge difference.

It will be very instructive to build this amplifier, see how it performs, and maybe replace a few parts with better ones. But nothing will make it equal to what you can design and build yourself, with the same parts count.

I am curious to know how this project turns out. It looks like a great introduction to electronics.
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Old 7th June 2013, 02:53 PM   #18
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Quote:
Originally Posted by activexp View Post
I don't believe that product exists Or if it does the shipping will be much more than $0.66

If you click on the link on the right 'This product on Taobao.com' you get a product not found message
Looking at the listing again, there is a shipping weight mentioned, so I'm guessing they are selling just an image?
I must resist the temptation of bargain amps, I must resist the temptation of .....................
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Old 7th June 2013, 03:52 PM   #19
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hmm. Buyer beware! I tried to order throught that page but my payment got bumped to a different site and now they're trying to 'upsell' me on the shipping.

Buyer beware!
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Old 7th June 2013, 05:19 PM   #20
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Quote:
Originally Posted by AudioLapDance View Post
hmm. Buyer beware! I tried to order throught that page but my payment got bumped to a different site and now they're trying to 'upsell' me on the shipping.

Buyer beware!
Yes it happened to me but I was buying other stuff too. They said that the actual shipping weight was more than quoted on the site for the items and consequently the shipping charges would be more. I had the option to cancel but I agreed to pay the extra as the total amount was still reasonable. As it turned out they refunded some of it as they'd over-estimated the total weight.

I believe they're quite honest and the 'Live Support' people speak good English and are really helpful. My order was well packed and sent tracked with all the correct forms for customs. I would confidently buy from them again
Hope this helps.
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