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Old 3rd September 2010, 09:35 PM   #1
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Location: Recife - Brasil Northeast
Default Introducing you Mitchel's minimalist Préamplifier

I have bougth a kit.... from Miguel Nabuco (120 USD)... will assemble soon to test...he is called Mitchel in this forum.

He was the man that produced boards and layouts and eagle files to the Dx Blame Brazilian group buy...i feel gratitude to him, reason why i am showing his work.

Nabuco Eletrônica - Kits de Áudio Hi-Fi

Maybe you gonna need to remove the ending br, there you gonna find a pdf with schematic to DIY, also boards pictures and explanations.... in portuguese.

YouTube - Nabuco Pre amplifier 1

YouTube - Nabuco Pré Amplifier - Part 2A

YouTube - Nabuco Pré amplifier - Part 2B

YouTube - Nabuco Pre amplifier 3

YouTube - Nabuco Pré Amplifier 4

YouTube - Nabuco Pré Amplifier 5

YouTube - Nabuco Pré amplifier 6

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 5th September 2010, 09:03 PM   #2
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Default Here one of his pages

Nabuco Eletrônica - Kits de Áudio Hi-Fi

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 25th September 2010, 09:10 AM   #3
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Default I am starting to assemble

Dip swithes controls the chip gain....there's an input potentiometer too and more two boards...supply and input selector using micro relays and routating panel switch.

regards,

Carlos
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File Type: jpg Pré Nabuco.jpg (213.4 KB, 591 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 25th September 2010 at 09:12 AM.
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Old 26th September 2010, 12:05 AM   #4
Mitchel is offline Mitchel  Brazil
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Hello Carlos,

Thank you for sharing your impressions on the preamplifier with us all!
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Old 26th September 2010, 04:06 AM   #5
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Default When finished i will inform what i think about

It is very interesting because we can test several Op Amps... this is very nice, as provides knowledge and hours of enjoyment observing the sonic signature of each one of them.

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 26th September 2010, 11:03 AM   #6
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Default Take a look about our options and the output main characteristic

Interesting chart made by Jeon Seob Shin.

regards,

Carlos
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File Type: jpg DSC01362.jpg (848.2 KB, 465 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 28th September 2010, 10:54 AM   #7
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Default I have assembled, the input identification leds will be substituted by a smaller ones

Volume potentiometer and also sensitivity switch does not appear in the picture.

regards,

Carlos
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File Type: jpg Nabuco's preamplifier.jpg (641.6 KB, 372 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 4th December 2010, 05:55 AM   #8
st3al is offline st3al  Argentina
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It's an interesting kit!, how i can pay you the preamplifier? (Could be Paypal?) I'm from Argentina. How do you send the kit?

A few more days I could pay via paypal, i haven't got international credit card yet., so I've to wait...
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Old 4th December 2010, 01:07 PM   #9
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Default Goto Miguel Nabuco, he is Mitchel in this forum

He has paypall and can send to you i am sure...he has case too....it is DIY..you assemble.

He is the one is running the group buy to the Dx Blame ST

Watch here: Nabuco Eletrônica - Kits de Áudio Hi-Fi

His personnal email is: miguelnabuco@terra.com.br

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 4th December 2010, 01:21 PM   #10
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dear sir
greetings are you using ic OPA2134 FROM BURR BROWN can studio
preamplifier from silicon chip australia be used with amplifier it is a very high
end preamplifier have finished supply pcb for your lovely amplifier has delay
dc protector short circuit protection clip led all on one pcb is it okay i have
transformer 40 0 40 ac 6 amperes
thanking you
andrew lebon
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