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Old 3rd March 2015, 04:59 PM   #1
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Default LM3886TF Power Amplifier Kit

Hello folks,

I intend to purchase this LM3886TF Power Amplifier Kit.

What are your impressions?

Can you recommend a suitable transformer for it?

Many thanks,

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Old 4th March 2015, 03:56 PM   #2
djoffe is offline djoffe  United States
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Do they provide a schematic?

It looks like perhaps they've left off a number of the components that really should be there for a robust design, but I can't say for sure given that I haven't yet found their schematic.
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Old 4th March 2015, 04:13 PM   #3
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Thank you djoffe,...nope I did not find the schematic : ( Any thoughts on suitable transformers possibly?
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Old 4th March 2015, 05:09 PM   #4
Electrons are yellow and more is better!
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Transformer size i mentioned in the link you have posted. Did you read the product description? If you ask me 2 x 24 VAC is perfect for you.
/Per-Anders (my first name) or P-A as my friends call me
Group buy Pavel Dudeks excellent LM4780 based amp No pcb's left.
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Old 4th March 2015, 05:32 PM   #5
AndrewT is offline AndrewT  Scotland
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Is it a "kit" of bits?
or just a PCB?
What customer support do they give to the kit assemblers?
regards Andrew T.
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Old 4th March 2015, 05:48 PM   #6
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Originally Posted by Romain123 View Post
These kits and the PCBs shown, turn up in a lot of basic LM38XX Ebay kit promotions. They are sold by dozens of Chinese traders. These and most similar minimalist kits are just the basic schematic shown in TI's application notes so there is nothing to compare other than what's missing from the full-form application. The power supply is a basic bridge rectifier with cheap caps but having 20,000 uF per rail, should be a good start.

The keynote here is low price so you will have to accept some compromises but that may not be a real problem for you. At least it isn't a problem for a few people I'm aware of that already use them.

The Chipamp forum is the appropriate place to find out more about these and how they compare with more expensive and probably better quality 3886 DIY designs. Take a look at the threads there.
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Old 4th March 2015, 06:30 PM   #7
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Thanks for the detailed answer Ian. I am just beginning in this, so a cheap kit may be a good way to build my skills and maybe work with better designs in the future.

I will rummage the Chipamp forum for future alternatives, thanks again!


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