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-   -   Chipamp 3886 - What do I have and what can it do? (http://www.diyaudio.com/forums/chipamp/200875-chipamp-3886-what-do-i-have-what-can-do.html)

EricPtek 20th November 2011 05:38 PM

Chipamp 3886 - What do I have and what can it do?
 
Several years ago, probably 4-5 I bought a Chipamp 3886 kit.

I assembled the individual pieces and the idea kind of faded away.

Decided to pick up the hobby again and force myself to make the time for a hobby once again.

So I pulled out the box I stored the stuff in. I've assembled the individual parts and I have a Lindberg Y236750 Transformer.

The original manuals do not seem to be on the website anymore and I have the V.1 boards.

How much can this push out wattage wise? For an initial project I'm looking to put together the amp and build a small set of speakers for my wife's office.

Are there assembly directions anywhere?

What would be a good pairing of inexpensive DIY speakers to pair with it? She'll be plugging it into her iMac. Maybe want to spend $150-$200 on the pair.

Thanks

Minion 20th November 2011 07:53 PM

I can"t answer some of your questions as I haven"t dealt with Chipamp.com or built their kits (I usually make my own boards) .....

As to the question of how much power it will put out that depends on the speaker load and the supply voltage ......

Theoreticly one LM3886 can do 65W into 4 ohm with a +/-28vDC supply and 50W into 8 Ohms with a +/-35vDC supply .....

So your supply voltage will determine the output power , but don"t use 4 ohm speakers with a +/-35vDc supply as you could fry the chip .....

If you posted pic of your PSU ,Transformer and LM3886 boards then someone can probably tell you how to connect it ......

Cheers

pinkmouse 20th November 2011 08:19 PM

:cop:

Thread moved to Chipamp.com forum

EricPtek 20th November 2011 09:53 PM

Did not realize there was a Chipamp forum.

Here is what I have:

http://farm7.staticflickr.com/6222/6...4ab5edf2_b.jpg
http://farm7.staticflickr.com/6098/6...f7efc990_b.jpg
http://farm7.staticflickr.com/6223/6...d0fb9e9f_b.jpg
http://farm7.staticflickr.com/6043/6...0462d8e2_b.jpg

MrDragon1 20th November 2011 10:29 PM

Do you have 2 of the amplifier boards? If not you will have a mono amp as the LM3886 is a mono part. Info on the LM3886 can be found here:

LM3886 - High-Performance 68W Audio Power Amplifier with Mute

As far as power/sound goes, I have a feeling you will be impressed with the output a pair of these can do. I have built a few gainclones (both kits and my own) now and have yet to be let down by them.

EricPtek 20th November 2011 11:08 PM

Quote:

Originally Posted by MrDragon1 (Post 2789109)
Do you have 2 of the amplifier boards? If not you will have a mono amp as the LM3886 is a mono part. Info on the LM3886 can be found here:

LM3886 - High-Performance 68W Audio Power Amplifier with Mute

As far as power/sound goes, I have a feeling you will be impressed with the output a pair of these can do. I have built a few gainclones (both kits and my own) now and have yet to be let down by them.

Yes I have both boards. I was looking for a good cheap pair of DIY speakers to pair it with. Small room, music inclined, replacing a set of old Cambridge Soundworks 2.1's.

JL889 21st November 2011 12:41 AM

Hey Eric, I will get some answers for your shortly. -Joe

EricPtek 21st November 2011 12:47 AM

Quote:

Originally Posted by JL889 (Post 2789240)
Hey Eric, I will get some answers for your shortly. -Joe

Great thanks!

While I'm at it I was looking at some assembled units and it seems I'm missing the Ci capacitor that is right in front of the 3886 itself, its missing from both boards.

What is the part number so I can pick 2 of them up.

Thanks

TomTerrific 21st November 2011 01:18 AM

This is a great little amp. The user guide is here:
http://chipamp.com/docs/lm3886-manual.pdf
The Ci cap is 47uf 50V Panasonic FC and is optional.

GloBug 21st November 2011 01:56 AM

Quote:

Originally Posted by TomTerrific (Post 2789256)
This is a great little amp. The user guide is here:
http://chipamp.com/docs/lm3886-manual.pdf
The Ci cap is 47uf 50V Panasonic FC and is optional.

Yoink!


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