MPP

Joachim Gerhard · 2012-01-13 12:17 am

That must be in the new 4th edition that came out this year. I do not have that circuit in the 3rd. edition.

hesener · 2012-01-13 1:46 pm

PCBs have arrived......

;-)

Joachim Gerhard · 2012-01-13 1:48 pm

Cool !
Did the ones for the pre-regulator arrive too ?

FdW · 2012-01-13 1:51 pm

hesener said:
;-)

Cool, cooler ... coolest. Actual picture of the actual board

Audiofanatic · 2012-01-13 1:54 pm

Do I see my name written one one !

hesener said:
;-)

Nice job!

Audiofanatic

Bksabath · 2012-01-13 2:02 pm

hesener said:
;-)

Dear Joakim hesener

I may be jumping the gun and still would like to be beta tester for first build.

But if one set is available and or + critical component kit is an option I would be very interested to get one

Could you let me know either way?

hesener · 2012-01-13 2:11 pm

Bksabath said:
Joakim hesener

Hi Bksabath, you have PM. by the way, Joachim and myself are two different persons last time I checked ;-))))

Salas · 2012-01-13 2:15 pm

Nice result. :up:

bear · 2012-01-13 2:19 pm

Joachim Gerhard said:
That must be in the new 4th edition that came out this year. I do not have that circuit in the 3rd. edition.

So he follows, not leads... ok.

_-_-bear

hesener · 2012-01-13 2:19 pm

Hi guys, lots of PMs flying around - before we all get excited: the first bunch of PCBs is kind of promised, but once they are verified and final changes implemented I will organise a group buy, promised!

Joachim Gerhard · 2012-01-13 2:42 pm

Yes, the designers have to sort out first if there is any bug. This is not your typical easy DIY project and it does only exist in the simulator at the moment. I do expect though that it will work.

Joachim Gerhard · 2012-01-13 3:05 pm

I had a short conversation with Hesener. He did not design a pre-regualtor board so far so this has to be build the old fashioned way at the moment. If enough interest comes maybe i can persuade him to design a board for this too, or is that something for you Bksabath ?

Bksabath · 2012-01-13 3:31 pm

hesener said:
Hi Bksabath, you have PM. by the way, Joachim and myself are two different persons last time I checked ;-))))

Sorry Intended messagge to you both shuld have been Joachim / hesener or even hesener / Joachim

Tanks for PM
You got one back

Bksabath · 2012-01-13 3:37 pm

Joachim Gerhard said:
I had a short conversation with Hesener. He did not design a pre-regualtor board so far so this has to be build the old fashioned way at the moment. If enough interest comes maybe i can persuade him to design a board for this too, or is that something for you Bksabath ?

I am hapy to do aniting I can.

But seeing hesener design and first batch of pcb one would not certanly spoil thing by going cheap and nasty.

I can do protos for personal use and one off boards.

But when is time to go for the full build I would not buy one of mines..

Could you send me SCH and component specs I can have a go at it any way.

Joachim Gerhard · 2012-01-13 3:51 pm

It was posted by Frans somewhere here.
Maybe Frans should post the pre regulator section alone.
We have to agree on a power transformer. I think Frans prefers toroids.
I will look out for some.

FdW · 2012-01-13 5:28 pm

Joachim Gerhard said:
It was posted by Frans somewhere here.
Maybe Frans should post the pre regulator section alone.
We have to agree on a power transformer. I think Frans prefers toroids.
I will look out for some.

> Maybe Frans should post the pre regulator section alone.
Yes I do

> We have to agree on a power transformer
I always get my transformers from Cybertron

Or:

http://www.amplimo.nl/images/downloads/ds standardrange/18016.pdf when using one
http://www.amplimo.nl/images/downloads/ds standardrange/08016.pdf when dual mono (prefered)

> I think Frans prefers toroids
Yes I do

Regards,
Frans.

P.s. When using toroids you should alwais put them in a separate metal (iron) box and that box should include the mains filter!

Joachim Gerhard · 2012-01-13 5:42 pm

I usually use Block or Talema but they are not available in the voltages we need so let´s use the Amplimos.

kamis · 2012-01-13 6:02 pm

UI core low profile mains transformers are the best for audio.

nicoch58 · 2012-01-13 6:09 pm

r-core...

FdW · 2012-01-13 6:16 pm

nicoch58 said:
r-core...

r-Cores are cool

r-core transformers

and you do not need the 'extra' metal (iron) box, but I would still do that.

The main point about the transformer is:

25VAC 400mA (minimum) for stereo or 2 transformers of 25VAC 200mA (minimum) for dual mono (preferred).

Regards,
Frans.

P.s. I still do like the dynamics of toroids (and will use them (toroids that is)

)

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