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Old 6th December 2005, 07:16 PM   #31
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Quote:
Originally posted by rudi
t. download them and rename them with a .zip at the end then it works fine

Carlos you hijacker - just kidding
Cheers Rudi!

I'll give it a try
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Old 6th December 2005, 07:23 PM   #32
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Originally posted by t.


I admit to liking the MUR860's probably best with the GC amps though and the Schottkies better if regulators are used

T , just somehting that i have noticed. with the X the MBR 10100 were better, and with a snubber evenmore so. but you will let us know when you build yours. it was a compromise because i need to do the entrire spectrum with the amp and for that reason i chose the MUR860

NB: anybody that wants to build the amp with MBR10100 should be aware that you would not have all the bass you are used to. and if you have a small speaker system then the MBR are not recommended. but with a proper fullrange system you will be richly rewarded
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Old 6th December 2005, 07:40 PM   #33
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Thats better, nice one Rudi
I'll let you know as soon as I can get the new board built, this is going to be a busy month for me
It goes quite for a while and all these projects come at once

Sorry to go off topic
Thats an interesting looking pre-amp Carlos
I've actually got a couple of those SMD AD815's but never used them for anything yet, I can easily modify your amp and implement the AD815 if I can find my magnifying glass and tweezers
Is there any threads with the layout? I could build this easy enough from your schematic but how did you manage to fit all the parts so close to the chip, its tiny
I could cheat and etch a board but no doubt its not as good as a tightly done p2p
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Old 6th December 2005, 09:46 PM   #34
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Quote:
Originally posted by t.
Thats better, nice one Rudi
Did you have any problem downloading the file?

It's a .zip, with 3 .png graphic files inside...

Quote:
Originally posted by t.
Sorry to go off topic
Thats an interesting looking pre-amp Carlos
That may as well be the preamp of your life.
I'm not joking, this is serious.
And you can use it with whatever amp you have.

Quote:
Originally posted by t.
Is there any threads with the layout? I could build this easy enough from your schematic but how did you manage to fit all the parts so close to the chip, its tiny
I could cheat and etch a board but no doubt its not as good as a tightly done p2p
Leo, the chip is not tiny, even the SMD version is quite big and relatively easy to work with.
Look at the datasheet for the pinout of the SMD version.
It has a perfect pinout.
It has the PSU pins located exactly where all the op-amps should, I mean if it was an 8 leg thing that would be pins 4 and 5.
I have never made a PCB for it, although I had the intention (but no time). My prototype (on veroboard) ended up as definitive inside my pre.
Some weeks ago Peter Daniel sent me some non-smd AD815 chips and I made this test setup.
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Old 6th December 2005, 09:47 PM   #35
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This heatsink is very oversized. It doesn't even get warm.
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Old 6th December 2005, 10:00 PM   #36
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Hi Carlos,

I could download your file but the pc would not open it, as soon as I added .zip at the end of the file name suggested by Rudi it worked fine

I've just dug out my smd AD815, your right, its not as small as I thought but I know how important the layout is so i'd like to get it right

Excellent work from you again and thanks for sharing I'll have a dig through my parts box, I've been after a nice pre for a while, I've got Nuuks tube pre to try too.
I presume an 8v reg would be ok for the nulling circuit
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Old 6th December 2005, 10:33 PM   #37
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I presume an 8v reg would be ok for the nulling circuit
Yes, it's fine.
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Old 7th December 2005, 04:39 AM   #38
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carlosfm,

i remember you posted the source of your 10k pots...(the green sturdy looking ones in your non soic 815 preamp)

could you post the link again?

i can't seem to find a good 10k pot other than the panasonic ones... (in the US)

thanks,
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Old 7th December 2005, 04:47 AM   #39
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The small pot was described here: "Silver-Carbon" Pot ex Tawan - Photo - & ignore my ugly Pinky!

In US, percyaudio.com caries good selection of pots, the $20 Nobles being pretty good choice.
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Old 7th December 2005, 05:07 AM   #40
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jaycar double gang log pot

well the green pot is only 5 dollars... (which is better than 20 dollars... at this point in my life)

i will post my 815 preamp implementation shortly.
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