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Old 21st April 2007, 09:24 PM   #1721
orto is offline orto  United States
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Hi Peter, I'm thinking about copying your patak enclosure design for my lm4780 kit. Would heat be an issue with the higher power output of this chip? Also I noticed that the side pieces seem to be made of solid wood in some pictures, but not in all of them. The other pictures seem to suggest you made an insert of aluminum for the side that covers the caps. Just curious about this, and which way you have decided to go.

Here's the links to the pictures to help clarify.

No aluminum http://www.audiosector.com/images/patek/Patek3.jpg
Insert http://www.audiosector.com/images/patek/Patek11.jpg
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Old 21st April 2007, 10:11 PM   #1722
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It's not the insert, it's nickel conductive paint. I only made few amps like that initially, all other amps use dual side panels (Patek v2).

The inside panels are from maple, sprayed with conductive coating; the outside panels are exotic wood, usually Maccasar Ebony.

The chassis can probably dissipate 2 x 5W of continuous power (100Hz sine wave into dummy load). It works well in real live with LM3875 chip, without any overheating issues. If you want to use LM4780 chip for more power, that chassis may be too small.

I'm presently also using bottom panel for heat dissipation, it is attached to copper bar through aluminum block.
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Old 21st April 2007, 10:14 PM   #1723
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Quote:
Originally posted by jleaman
What is the total price for the kit then with led display and kit,
Untill I am in position to secure reliable supply of display modules, I won't be offering that circuit as a kit. Presently, only PCBs and control chip are available. If you are able to source all the other parts yourself, you can complete that project.
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Old 26th April 2007, 01:57 AM   #1724
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Peter, at this time what are you curenly using for a pre-amp ? is it passive or buffer ?

I'm currently using one of Brent's buffer with my Aleph's. I'm impressed, but wondering what you use ?
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Old 27th April 2007, 05:09 AM   #1725
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I was using all sort of different pieces, but eventually I'm coming back to TVC: it is my current opinion that it is the most neutral line stage. The gain is limited to 6dB only, so it's not really completely passive.
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Old 27th April 2007, 05:12 AM   #1726
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BTW, I received the USB DAC boards today. I will be building one tomorrow to see if everything works fine.
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Old 27th April 2007, 05:15 AM   #1727
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Quote:
Originally posted by Peter Daniel
BTW, I received the USB DAC boards today. I will be building one tomorrow to see if everything works fine.
Ahhhh....thats what I've been waiting for! Let us know how it goes.
Robert
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Old 27th April 2007, 06:27 AM   #1728
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Quote:
Originally posted by Peter Daniel
I was using all sort of different pieces, but eventually I'm coming back to TVC: it is my current opinion that it is the most neutral line stage. The gain is limited to 6dB only, so it's not really completely passive.

Very nice, of course out of my price range i'm running passive and Brent's buffer. i'm loving the passive with the nice alps pot i have, i'm curious to see if i get the same results with your relay based one.
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Old 27th April 2007, 03:23 PM   #1729
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The boards came out really nice this time:
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Old 27th April 2007, 11:45 PM   #1730
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The circuit has been tested and it works fine.
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