[amphead]

The experimental MAX mask has been corrected for the error in the power supply. I looked the mask over again and didn't see anything, so I will once again call it final. Still working on the ground plane/ top mask.Edit: Nothing is really final until top and bottom masks line up correctly. I can't say that I enjoy this process, because I would rather be populating a board, soldering, testing and listening! There will be a huge payoff, knowing that you have created a MAX from scratch and it sounds sooooo good! Almost like reaching outer space on your own amateur rocket!

 

[vixr]

this fade circuit is kinda interesting... I built it to see if it would work under the MAX tubes. I think the center LED pad on the MAX board could power the fader... I used a 100K trimpot to be able to change the speed of the fade. the chip is a LM1458

here is a little video (sorry I'm no Tangent)

 

[tomb]

Very enterprising, Vixr!

 

[tomb]

I don't know if you guys caught this (I'm usually the last to know), but Pete Millett updated his "low-voltage hybrid headphone amp" pages to include a note about the MAX board and a link to the MAX website:

http://www.pmillett.com/hybrid_head.htm

 

[amphead]

Thats really great that Pete, was able to see the MAX. It looks like he was extremely busy and only just recently became aware of it. It seems that he was really blown away by it. Awesome!

 

[amphead]

Good idea Vixr!

 

[bhjazz]

Quote:

Originally Posted by vixr /img/forum/go_quote.gif this fade circuit is kinda interesting... I built it to see if it would work under the MAX tubes. I think the center LED pad on the MAX board could power the fader... I used a 100K trimpot to be able to change the speed of the fade. the chip is a LM1458

vixr that's awesome! I have seen some circuits that take a far larger chip to do what you just designed, so kudos to you. This is something I want to incorporate into a design later this year, so may I use it? (I'll definitely give you a shoutout!)

bhjazz...the LED monkey

 

[vixr]

Quote:

Originally Posted by bhjazz /img/forum/go_quote.gif This is something I want to incorporate into a design later this year, so may I use it?

by all means, use it... I'm glad to see I wasn't the only one who thought it was cool. the litte proto board measures 1.750"x 1.50", radioshack P/N 276-0150... You could probably do a much neater job building it...BTW the trimpot is in place of the bottom center 47K resistor in the schematic, right above the "D" in Drawn by...the video shows the fader in its slowest rate, the fastest rate just stays on...

 

[n_maher]

Quote:

Originally Posted by amphead /img/forum/go_quote.gif Thats really great that Pete, was able to see the MAX. It looks like he was extremely busy and only just recently became aware of it. It seems that he was really blown away by it. Awesome!

Pete's been aware of the MAX concept from the moment that we (Colin really) started experimenting with the design again. And like every other revision of the hybrid I sent him a copy of the pcb (both the proto and final production version) so that he has a record of how the design progresses. I only mention this because I think asking permission is an important part of the process and shouldn't be overlooked.

 

[tomb]

Quote:

Originally Posted by n_maher /img/forum/go_quote.gif Pete's been aware of the MAX concept from the moment that we (Colin really) started experimenting with the design again. And like every other revision of the hybrid I sent him a copy of the pcb (both the proto and final production version) so that he has a record of how the design progresses. I only mention this because I think asking permission is an important part of the process and shouldn't be overlooked.

Of course! Many thanks for you doing just that, Nate.

 

[c0nsumer]

Hrm. Well, the software for my MAX input switch is working... Now to finish selecting parts and design the PCB.

 

[amphead]

Thanks for the info Nate! Its very interesting to know the twists and turns that preceded the building of the first MAX. Edit: Also, thank you for your efforts/contributions that helped to bring the MAX to life! btw, what is your feeling about the sharing of the official MAX mask images, both top and bottom? It would be better quality than what the "experimental" mask is going to be. You are absolutely right about the permission being sought, for any designers intellectual property. Pete Millett's site describes very well what he expects from those who use his designs.
.

Ron

 

[vixr]

removed a really dumb post...

 

[matt303]

Anyone used AKG K601 headphones with their MAX?

I normally use Grado SR60s but I rather like the idea of giving a pair of K601s a go.

 

[tomb]

Quote:

Originally Posted by matt303 /img/forum/go_quote.gif Anyone used AKG K601 headphones with their MAX? I normally use Grado SR60s but I rather like the idea of giving a pair of K601s a go.

We have a couple of builders confirm that the MAX drives K701s very well. If the headphones are similar, the MAX shouldn't have any problem with them.