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Author Topic: acoustic guitar preamp  (Read 10050 times)

checco1280

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acoustic guitar preamp
« on: December 05, 2009, 04:54:23 AM »
Hi to everyone!!! my name is francesco, I'm from Italy...

I need a preamp for acoustic guitar (with tone stack too) , I think to use a LM3886 for the power stage....

what do you think about?

baene123

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Re: acoustic guitar preamp
« Reply #1 on: December 06, 2009, 05:28:07 AM »
ma guarda chi si trova qua! ;D ;D

checco1280

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Re: acoustic guitar preamp
« Reply #2 on: December 06, 2009, 09:35:26 PM »
..e no...ero così conento che una persona mi avesse risposto.... :lmao:

mannaggia sto inglese, che non riesco a far capire una cippa a nessuno....

intanto mi sono documentato...ho in mente una bella cosuccia...ci sentiamo su fennec..... :tu: :tu: :tu:

tonyharker

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Re: acoustic guitar preamp
« Reply #3 on: December 07, 2009, 04:30:53 AM »
Please write in English - we would all like to understand what you say!
« Last Edit: December 07, 2009, 04:33:51 AM by tonyharker »

J M Fahey

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Re: acoustic guitar preamp
« Reply #4 on: December 07, 2009, 02:18:20 PM »
Uncalled for, poor translation follows:
>>>>>>>
"ma guarda chi si trova qua! " = Hey!!, look who's here !!!
"..e no...ero così conento che una persona mi avesse risposto.... Funny

mannaggia sto inglese, che non riesco a far capire una cippa a nessuno....

intanto mi sono documentato...ho in mente una bella cosuccia...ci sentiamo su fennec..... "=<<<<<<<<

>>>>>>oh no, I was so happy that (at least) one person answered
#~$#~&* these "english" who can't be understood by anybody
meanwhile I "documented" (searched?) ... I have a "little something" (a good idea?) .... we "feel it" (found it?) in the "fennec": http://www.fennecelectronics.it/ (a DIY electronics site)
<<<<<<<
The somewhat poor Italian original does not help much. ;)

checco1280

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Re: acoustic guitar preamp
« Reply #5 on: December 10, 2009, 06:10:10 AM »
sorry...for writing in Italian, the translation by fahey is correct...but my question is still unanswered... :'(

phatt

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Re: acoustic guitar preamp
« Reply #6 on: December 10, 2009, 10:15:24 AM »

Hello checco,
                   I've had great success with this one it may interest you.
http://www.ssguitar.com/index.php?topic=1136.0
I take it you wish to DIY a circuit?

Cheers Phil.

J M Fahey

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Re: acoustic guitar preamp
« Reply #7 on: December 10, 2009, 10:16:32 AM »
Hi/Ciao Checco. A Ruby amp,http://www.runoffgroove.com/ruby.html ,  with it's Fet high impedance input makes a good preamp, if you use it without the 1K gain trimmer/pot.
It becomes a 20x gain clean preamp. On its output, instead of a speaker you can hook a 1Kohm resistor and reduce the output capacitor from 220uF to 10uF.
You can get 9V from the +35V LM3886 supply with a 1K1W resistor, a 9V Zener and a 100uFx25V capacitor.
If you find it confusing, I can draw a schematic.
Ciao amico e buona fortuna.

phatt

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Re: acoustic guitar preamp
« Reply #8 on: December 10, 2009, 10:35:07 AM »
Opp's forgot to say.  I'm assuming your Acoustic guitar has a built in preamp?
If NOT?   Then you need a different setup.
Phil.

checco1280

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Re: acoustic guitar preamp
« Reply #9 on: December 10, 2009, 01:46:02 PM »
Hi/Ciao Checco. A Ruby amp,http://www.runoffgroove.com/ruby.html ,  with it's Fet high impedance input makes a good preamp, if you use it without the 1K gain trimmer/pot.
It becomes a 20x gain clean preamp. On its output, instead of a speaker you can hook a 1Kohm resistor and reduce the output capacitor from 220uF to 10uF.
You can get 9V from the +35V LM3886 supply with a 1K1W resistor, a 9V Zener and a 100uFx25V capacitor.
If you find it confusing, I can draw a schematic.
Ciao amico e buona fortuna.

Oh thanks!!!
according to you can I add an active tone stack? like a baxandall? what's its position? Or I need just a passive tonestack?
« Last Edit: December 10, 2009, 01:48:19 PM by checco1280 »

J M Fahey

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Re: acoustic guitar preamp
« Reply #10 on: December 10, 2009, 01:56:43 PM »
Yes, you can also add a Baxandall, between the preamp (Ruby) out and the 3886.
Anyway, start with a passive one that's simpler. Go step by step.
If I remember well: "Piano, piano, si va lontano"

checco1280

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Re: acoustic guitar preamp
« Reply #11 on: December 10, 2009, 02:22:00 PM »
"Piano, piano, si va lontano"  ;D ;D ;D ;D
you speak Italian?



checco1280

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Re: acoustic guitar preamp
« Reply #12 on: December 10, 2009, 02:28:38 PM »
With a passive tonestack  there isn't too much drop of gain?

J M Fahey

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Re: acoustic guitar preamp
« Reply #13 on: December 10, 2009, 03:28:11 PM »
1) Yes, there is a 3x to 4x loss, yet in clean amps many times I could drive properly modern sensitive power amps. Try it, it's free ! (and cheap). If you need more gain, you add what you need. We're talking, of course, *after* your Ruby, not straight from the guitar.
2) Buenos Aires had 60% (not a typo, sixty percent) Italian population in the 20's.
Today it still has over 50% Italian surnames.
I'm unusual here in not having one drop of Italian blood, although .... I married an ... Olivetti .... !! and my son speaks perfect Italian.
Io ne parlo só perche sono faccia di pietra, lei capisce?
Besides, Buenos Aires Spanish, called "porteño" or "lunfardo" is 30% Italian, and we are full of old ladies who still speak "mangia mangia che ti fa bene" , "te amazzo !!!", and 1000 colorful expressions or insults which I can't post here.
And Tango, quite unrelated to original Argentine/Spanish Folkloric music, is "the music made by the Italian Immigrants", uses accordion, piano and violin, most of the great composers were born Italian.

J M Fahey

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Re: acoustic guitar preamp
« Reply #14 on: December 10, 2009, 05:14:59 PM »
Hi, he wrote you today, maybe you clicked on the thumbnail and lost the original page. It's:
http://www.ssguitar.com/index.php?topic=1136.0
Phil/Phatt assumes there that you already have a preamp.
You may use the Ruby (clean) into the passive EQ into the power amp.
If you lack gain I'll post the simplest gain block.