Chipamp 4780 (1) Beta Build

[MadHattter]

Here are the pics / dimensions of the Chipamp power supply.

[MadHattter]

Here are the pics / dimensions of the finished LM3886 Mono Board.

[MadHattter]

LM4780 stereo integrated board pics / dimensions.

[MadHattter]

LM4780 Parallel board pics / dimensions.

[MadHattter]

Originally Posted by MadHattter

I am fairly new to the forum, and I am not sure if this is bad form, but I posted this to the LM3886 Beta Build thread as well, but I wanted to let others know about the board dimensions. I apologize if it is bad form. Someone please let me know if it is.

I saw that someone was wondering what the dimensions of one of the chipamp boards was, and while I can't help him with those dimensions, I can put the dimensions of the LM3886 Mono Board up here for people to see. I finally got it populated today and will spend the next few weeks (family, job, house and all) building the enclosure for them. Well, here is the link to the pics:

I also ordered and built the LM4780 Parallel board [LM4780 (1)] pics here:

And I ordered the LM4780 Bridge/Stereo board [LM4780 (2)] but have not put it together yet. Here are the pics of it as well:

Since I was at it, I took pics of the ChipAmp power supply. I am using one per LM4780 parallel amp.

I needed something to do this winter I guess.

I would like to apologize for stating that the LM4780 Stereo/Parallel board (blue) was a bridged / stereo board. I think it is time for me to go to bed.

[jb74]

I have several of these LM4780 boards (red) purchased from Chipamp.com in 2005

At that time the values for R6 and R7 were shown as 1.0k for each

What is the explanation for the change in their value to 221 ohms ?

Thanks

[GloBug]

How's everyone doing with there projects? Any plans to work on them this weekend?

Have fun. Al

[UrSv]

I'll be working on my two boards this weekend. They have been populated and now the enclosures needs some work which I hope there will be time for during the weekend.

[GloBug]

Cool!
For some reason I feel hungry....is that Swiss cheese on that burger?

[UrSv]

The enclosures are coming along nicely but as always when doing metal work it's a real pain not to have a proper shop to do things in. I bought a drill press from a local store earlier this week as it was on sale for a ridiculous EUR 54. Not that free hand milling is the way to do things but the precision was good enough for the mains receptacle which is the type with switch and fuse holder integrated (saved me two holes per panel ).

I'm using the power supply boards I had left over from a pair of Chipamp LM3886 amps. The build is a three channel amp with one LM4780 stereo board that will be for tweeter and boomer. The parallel LM4780 (1) from this Beta Build will be for the woofer. I'm currently looking to replace the HifiDIY.net boards with stereo boards from Chipamp or Audiosector as I like the smaller boards and it would look just a little bit nicer. Not that it would be visible. The enclosures will be mirror image back panels and will be standing close to each speaker with a component video cable (which reduces cable clutter as it is effectively one cable but will carry three signals) connected to the 2x8 MiniDSP which I'll use as filter.

Transformers are Amplimo 2*22 VAC @ 160 VA which will be just fine per channel.

Next thing to source is some aluminium L-shaped extrusions I need in order to mount the boards nicely to the side profiles of the case. Why, oh why, doesn't anybody sell 10 and 35 mm aluminium extrusions with 1 mm thickness where I live?

Originally Posted by GloBug

Cool!
For some reason I feel hungry....is that Swiss cheese on that burger?

Nah, it's cheese on a Max Burger from Sweden.