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Old 1st December 2005, 10:18 PM   #1
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Default Bass Preamp Circuit?? anybody??

I am looking for a simple IC based Bass Pre-amp circuit to use with a commerical power amp.

I am looking for a schematic or if someone in the US has an old dead bass amp that i could steal the pre-amp section out of. please let me know. it will be used for a cheapo practice rig.

email me at tetech2@doitnow.com
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Old 2nd December 2005, 09:05 AM   #2
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A lot depends what you want?, as a minimum a simple opamp stage with enough gain is all you need. But assuming you want tone controls and such?, there's a popular simple design at albertkreuzer.com .
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Old 2nd December 2005, 03:25 PM   #3
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You might try a second order highpass at 20 Hz to keep very low frequencies from pounding your speakers (depending on your technique, basses can generate tremendous amounts of subsonic energy). The schematic is dead simple, here's a link:

http://en.wikipedia.org/wiki/Sallen_Key_filter
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Old 2nd December 2005, 03:46 PM   #4
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Oops, forgot: make Q = 0.707. Ahh, let's make it easy. For the schematic in Wikipedia, use:

C1 = C2 = .47 uF, R1 = 24K. R2 = 12K.


Cheers,
Francois.
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Old 4th December 2005, 08:10 PM   #5
Brion55 is offline Brion55  United States
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Here's a simple preamp with 2 band EQ which works great for bass or guitar (change the EQ points). The gain can be set to drive a power amp just fine.
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File Type: gif guitar pre eq.gif (9.5 KB, 1849 views)
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Old 4th December 2005, 08:14 PM   #6
Brion55 is offline Brion55  United States
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This one has a very useful active midrange control.
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File Type: gif guitar para eq.gif (9.8 KB, 1764 views)
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Old 22nd January 2006, 10:24 AM   #7
DolbyR is offline DolbyR  Finland
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I am thinking about building this preamp cable http://www.till.com/articles/PreampCable/index.html for my bass...but is the 3db gain too low?
I'm usually connecting the bass to my PC but the signal is a bit on the low side, so would this preamp cable be enough or should i just go for Albert Kreutzers JFET preamp?
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Old 22nd January 2006, 10:31 AM   #8
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Quote:
Originally posted by DolbyR
I am thinking about building this preamp cable http://www.till.com/articles/PreampCable/index.html for my bass...but is the 3db gain too low?
I'm usually connecting the bass to my PC but the signal is a bit on the low side, so would this preamp cable be enough or should i just go for Albert Kreutzers JFET preamp?
The JFET version would give you full controls, just like a poper preamp, if all you want is some extra gain just use a simple opamp to give you the gain you require.

The PreampCable isn't really designed to give 'gain' as such, just to help prevent possible losses in the cable.
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Old 26th January 2006, 08:31 PM   #9
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hi i m tryin to build a bass amp for myself too .. i m not w cable preamp .. i built the albert kreuzer preamp .. but i wanna to build a tube pre amp for for my amp ,, u can find the "REAL McTUBE" pre amp at www.tonepad.com ... it s a very very simple tube preamp w just one 12ax7 ( or at7 or au7 ... ) and i m tryin to change the marshall guitar tone control circuit and use it for bass preamp , ... i built the tube pre amp but i didn t test it yet ,, i ll test it soon , and ll tell if it the sounds good
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Old 5th November 2006, 09:15 AM   #10
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hi all... it's my first post...

i'm saska from Indonesia
lol...

do u happen to have any picture of the finished 3 band eq for bass?

anyone can guide me through to build one?

i'd like to try to build one for my bass...
btw...

here's a link to a picture of my bass..... :P

thnx....

http://www.myspace.com/bobibenz
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