Bass preamp: non-inverting an inverting tone stack (opamp) - Page 2 - diyAudio
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Old 5th January 2013, 11:03 PM   #11
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JonSnell Electronic's Avatar
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Hi, if you use an LF353 I don't see a problem. It has a Jug Fet input, so very high impedance, most preamps are 50K and this one is several Meg Ohms.
Take your 10K to ground and 470K from pin 3 to ground and then feed your signal in through a 100n Cap and a 10K resistor in series.
I think you will find that will do more than you hoped for.
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Old 5th January 2013, 11:20 PM   #12
JMFahey is offline JMFahey  Argentina
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Join Date: Mar 2009
Location: Buenos Aires - Argentina
Search for a bass pream specific schematic.
The one in the datasheet is fine ... for a Hi Fi preamp, with +/-15V rails, driven from a low impedance, etc.
You need high input impedance to properly load your pickups (the 470K suggested above instead of 10 K is fine) and running out of a 9V battery is more practical in that situation.
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Old 9th January 2013, 04:09 PM   #13
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Join Date: Nov 2007
Location: Near Dallas Texas USA
Here is a link to a nice bass preamp built around the 3 band Baxandall EQ. It uses JFETs but it will get you started. Link:
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Old 9th January 2013, 07:03 PM   #14
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Location: Helsinki, Finland
Thanks guys! Everything works as it should now!
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