Brunetti - Mercury  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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nickthemen
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Post by nickthemen »

I played this box and it sounded like the best thing i heard in al while\!
The picture i got from the site.
This is the nr 1 on my list to build.
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Greg
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Post by Greg »

culturejam wrote: We are equal opportunity exposure artists.

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SPeter
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Post by SPeter »

:D
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non_non
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Post by non_non »

Schematic ?

THx :)

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Greg
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Post by Greg »

non_non wrote:Schematic ?

THx :)
If we have a schematic.. it'll be in the thread.
Or.. we'd be very happy for you to provide one.
Thx
culturejam wrote: We are equal opportunity exposure artists.

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Gila_Crisis
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Post by Gila_Crisis »

I played one and tried all their other pedals and amps, when I went to their factory-visit in Modena in February.
They do really fine amps and stompboxes! (I own an XL-Revo head with an XL-Cab and an Overtone2 valve preamp, I really love this brand)
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roseblood11
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Post by roseblood11 »

btw: That´s Gregor Hilden, from Münster/Germany. Great Blues Player!!!
He has a lot of demos on youtube:
https://www.youtube.com/user/gregsguitars?blend=1&ob=4

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stan_the_man
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Post by stan_the_man »

no comment...
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roseblood11
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Post by roseblood11 »

Great work!

The voltage doubler ic (icl7662) is a discontinued product. Would be better to chose a max1044 or icl7660S for a clone...

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Post by mictester »

roseblood11 wrote:Great work!

The voltage doubler ic (icl7662) is a discontinued product. Would be better to chose a max1044 or icl7660S for a clone...
Word of warning - don't try to use the ordinary ICL7660. Make sure you get the "S" version - it has a much higher clock frequency and is therefore much less likely to cause interference to your signal.
"Why is it humming?" "Because it doesn't know the words!"

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nickthemen
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Post by nickthemen »

Nice pics !
This is what i got from it:
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Post by flood »

mictester wrote:
roseblood11 wrote:Great work!

The voltage doubler ic (icl7662) is a discontinued product. Would be better to chose a max1044 or icl7660S for a clone...
Word of warning - don't try to use the ordinary ICL7660. Make sure you get the "S" version - it has a much higher clock frequency and is therefore much less likely to cause interference to your signal.
what about the 7660CPA?
In the interest of full disclosure, I am Animal Factory Amplification.

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Post by Gila_Crisis »

nickthemen wrote:Nice pics !
This is what i got from it:
sorry but this schem look a bit strange to me.... and where is the 4th pot??
Zwischen Ordnung und Chaos fangt die Musik an

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Sari
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Post by Sari »

flood wrote:
mictester wrote:
roseblood11 wrote:Great work!

The voltage doubler ic (icl7662) is a discontinued product. Would be better to chose a max1044 or icl7660S for a clone...
Word of warning - don't try to use the ordinary ICL7660. Make sure you get the "S" version - it has a much higher clock frequency and is therefore much less likely to cause interference to your signal.
what about the 7660CPA?

You can use the MAX1044 with no problems and you can jumper two legs to get the sw. freq. above audio levels

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flood
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Post by flood »

the max1044 isn't available easily where i live (india). import is too expensive... the 7660CPA OTOH is fairly ubiquitous.
In the interest of full disclosure, I am Animal Factory Amplification.

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nickthemen
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Post by nickthemen »

This is what i can get the most out of it, maby stan can read the c values for us that are hidden in the pics.
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Post by bajaman »

Hi
That is reasonably accurate, however C3 is connected only to the wiper of the 250k gain pot - the other terminal is not connected to anything.
There is a 10n capacitor in parallel with the drain load 22k resistor on the second fet stage, and there is a capacitor connected between the op amp output and inverting input.
ALSO - the picture taken from the Brunetti site shows quite a few differences - 2 back to back 3mm red leds connected in the op amp feedback loop, a small diode instead of a resistor for the second fet source connection, a 100k output volume pot instead of the 50k pot just to name a few changes (there are more if you look closely - no prizes for finding them though :lol: )

SO - which is the current version?????
cheers
bajaman
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nickthemen
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Post by nickthemen »

You have very sharp eyes bajaman!
My gues is that the site picture is the older one.

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Post by nickthemen »

The site pic has an B on the print so it could be the Burning Box...

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Post by roseblood11 »

flood wrote:
mictester wrote:
roseblood11 wrote:Great work!

The voltage doubler ic (icl7662) is a discontinued product. Would be better to chose a max1044 or icl7660S for a clone...
Word of warning - don't try to use the ordinary ICL7660. Make sure you get the "S" version - it has a much higher clock frequency and is therefore much less likely to cause interference to your signal.
what about the 7660CPA?

No, only the "S"-version has a oscillator frequency that´s way above the audiosignal (if pins 1 and 8 are connected).
Other versions may produce noise...

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