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Group order of non-inverted LM3875 pc boards? Anyone interested?

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#865
Re: Re: Question on New Board...

ftjandra said:

I am pretty sure that that is for the capacitor part of the Zobel network that is now included on the board.

--Ferdi
Click to expand...

That is correct. There is placement for 3 new components on the pcb. The first is the feedback resistor, Rf, which used to be mounted on the package, and still can be. The other two are the zobel network components. I haven't tested the amplifier with the zobel network, but the component placement is there.

As for the zobel network components, I won't be providing them with the kits currently, as I haven't tested the amplifier with a Zobel network yet. It also adds $2 to the cost of a kit. Here are the suggested components:

Rz - 2.7ohm resistor (I would use a 3w panasonic)
Cz - 0.1uF capacitor with 5mm or 7.5mm spacing (I would use a BC components polyprop. from digikey)

I will consider the zobel components optional, but recommended if stability problems are encountered.

A brief description would be that it helps prevent against high frequency oscillation, which may occur with difficult loads/capacitive cables. Basically, it creates a low pass filter, with the 2.7ohm resistor and a 0.1uF cap creating a pole at 1/(2*pi*r*c), which can solve issues with cables, as well as reducing RF interference. According to some people, the Zobel network can have a negative effect on the sonic performance.

BTW, the Rz mounts on the bottom of the pcb. I have a new version of the manual that goes over the new pcb, and I will add material to include information on the Zobel network. Thanks to Sandy for his help with the manual.

--
Brian
 
#867
Brian,

I assume the manual linked to your order page is still the older one. When you do get a chance to post the new one it would probably make sense to add a revision number to it so a user can know which one to use.

I'm looking forward to the kit. Thanks doing such a great job!
 
#869
kec said:
Brian,

Is it too late to order a kit? Didn't know if you only have enough parts to fill the orders you already have.

Thanks,
Ken
Click to expand...

BrianGT's order page shows that he is accepting orders. He puts a not availalbe message instead of the PayPal button on an item when it is not available.

So presumably you should go ahead and order.

The order page is:

http://www.briangt.com/order/orders-us.html
 
#870
moving_electron said:
Brian,

I assume the manual linked to your order page is still the older one. When you do get a chance to post the new one it would probably make sense to add a revision number to it so a user can know which one to use.

I'm looking forward to the kit. Thanks doing such a great job!
Click to expand...

I have a new version that is being worked up now, and I will post it soon in the same place as the old one is at now.

kec said:
Brian,

Is it too late to order a kit? Didn't know if you only have enough parts to fill the orders you already have.

Thanks,
Ken
Click to expand...

I am still accepting orders, and will continue to until people stop wanting them:
http://www.briangt.com/order

Let me know if you have any more questions.

--
Brian
 
#879
All of the components for the international/canadian orders were mail to Peter a few days ago, as he stated earlier, and once he receives them, he will start shipping out the intl/canadian orders.

For the US orders, I mailed out 18 orders today, after organizing the rest of the parts this last weekend. I am resuming putting orders together now, and will mail another batch tomorrow. For those orders that were shipped out, delivery confirmation numbers should have been e-mailed out.

--
Brian
 
#880
BrianGT said:
All of the components for the international/canadian orders were mail to Peter a few days ago, as he stated earlier, and once he receives them, he will start shipping out the intl/canadian orders.

For the US orders, I mailed out 18 orders today, after organizing the rest of the parts this last weekend. I am resuming putting orders together now, and will mail another batch tomorrow. For those orders that were shipped out, delivery confirmation numbers should have been e-mailed out.

--
Brian
Click to expand...


Just got the email and wanted to say, Thanks for the awesome customer service!!! I know you're probably very busy with these and I hope I wasn't too much trouble!!!

Thanks again!!
 
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