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-   -   Bought a XY LM3886 Kit. (http://www.diyaudio.com/forums/chip-amps/207971-bought-xy-lm3886-kit.html)

Aguilabrava 2nd March 2012 08:29 PM

Bought a XY LM3886 Kit.
 
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Hi:

I am new to this forums here at DIYAUDIO, I found this site searching help for some issues I was having with speaker's crossovers.

Now, I have learn a lot from you all, it's been really nice, and this have encouraged me to experiment and learn more.

I recently purchased a XY LM3886 amplifier kit at eBay. It is composed of 2 amplifier boards and a regulated power supply unit. I have attached a picture of the actual kit I bought. I have not received it yet, but I want to know your opinions about this kit, and if there is anything to improve it.

I also purchased a ALPS potentiometer for it, I have seen that they also sell "speaker protection boards", do I need one of those?.

I also know I will need a transformer, I was thinking about a toroidal from Antek, the AS4222 22V 400VA, is this OK for this setup?.

Thank you very much.

malibujeff 2nd March 2012 09:23 PM

Take a look at this thread on the same amp --->> http://www.diyaudio.com/forums/chip-...kit-build.html

nigelwright7557 2nd March 2012 09:59 PM

There arent a great deal of components in the 3886 amp to change.
Maybe a larger input coupling capacitor to lift the bass end.

Minion 2nd March 2012 10:20 PM

And that power supply isn"t regulated , it is just a regular unregulated PSU ......

Aguilabrava 3rd March 2012 02:08 AM

Wima input capacitor replacement.
 
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Can I replace the Wima input capacitors with Audiophiler MKP 4.7uf 400V axial capacitors?. If not, what would be the best replacement?.

Do I need to get the "speaker protection board"?.

Thank you.

Minion 3rd March 2012 02:56 AM

Quote:

Originally Posted by Aguilabrava (Post 2931098)
Can I replace the Wima input capacitors with Audiophiler MKP 4.7uf 400V axial capacitors?. If not, what would be the best replacement?.

Do I need to get the "speaker protection board"?.

Thank you.

If you can fit them in there then go for it ..... i put in some huge 4.7uF mylar caps in my boards (got the boards for $2.50 each on e-bay) and was able to get them to fit but it is a really tight squeeze ......

As for the speaker protection I guess it is optional ......

Cheers

AndrewT 3rd March 2012 09:25 AM

have you got pics of the top and bottom of the blank PCB?

Many of these PCBs have commoned the Signal Ground with the Power Ground.

In a monoblock amplifier, you need to move the Main Audio Ground onto the PCB.
In a dual mono amplifier and in a stereo amplifier, you must cut the Signal Ground connection to the Power Ground. Then select an off board location for a single Main Audio Ground shared between the two channels.

If you have bought a parts kit from China, or nearby, then check that all the components are what is written on the labeling. You may have to discard many of the supplied Chinese components.

AndrewT 3rd March 2012 09:29 AM

Quote:

Originally Posted by malibujeff (Post 2930810)
...look at this thread on the same amp --->> http://www.diyaudio.com/forums/chip-...kit-build.html

and 118posts later he has successfully built his amplifier. All because there is no support from the retailer.

What if the Forum was not here?

triode_al 4th March 2012 03:42 PM

in my opinion, you need not use a relay, as long as you use the muting signal (pin 8) to disengage the output for some time while the circuit is stabilizing.

pacificblue 4th March 2012 05:35 PM

The speaker protection is optional, but recommendable. It protects the speakers in case the power transistors fail and rail voltage presents itself at the speaker output. In such a situation the muting pin can obviously not help.


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