For the past 3 months I have been constructing my first bass. I am 95% done with the instrument and the pickup. The part that is incomplete is the preamp/eq. I am looking for a simple 3-band circuit I could experiment with. I have found a few on the Internet but the documentation for these circuits is way over my head. Usually written for electronic engineers (ie. way too much information). Along with the circuit I would like to know which components I can modify to change the frequency response of the corresponding band. I know there are many off the shelf preamps available, but what is the fun in that. I have played enough basses in my time to know that not all preamps/eqs. are the same. There are a few good ones out there and a lot of horrible ones. Unfortunately for me the manufacturers of the good ones dont just give away the schematics to anybody. Any help or info would be appreciated.
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3-band Circuit/Schematic needed.
- Thread starter vanholt
- Start date
I would most likely go with a manufactured preamp. Unless you want to do a passive tone stack with a buffer/preamp boost section. Otherwise, it my be some very intensive circuit designing.
The thread linked below should give you some ideas. The first schem in post 31 is ideal, but you'll need a buffer between the pickup(s) and the input of the circuit.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=75949
http://www.diyaudio.com/forums/showthread.php?s=&threadid=75949
No problem with the buffer the bass only has one pickup so that should not be an issue. I am not familiar with that resistor and cap notation on a few. What does the 8 represent in the 1K8 resistor and the 7 in the 4n7 capacitor. I am assuming a 1K ohm resistor and a 4n farad capacitor. Any idea? Also what could I change to alter the Bass boost frequencies from 50hz to 40hz the mid frequency from 1Khz to 500Hz and the treble from 10Khz to 12Khz.
4n7 = 4.7nF etc. Moving the prefix allows showing the decimal place more clearly than a dot.vanholt said:
Depending on how much current consumption you're willing to put up with, there are a hell of a lot better opamps out there than a -351,-06x,-07x,553x etc.
Makes sense. I have only routed a cavity large enough for a single 9V battery so current consumption will play a role. I would rather change out a battery a little quicker and have good sound though. Which op amps have you had good experience with. For starters I purchased the TL0-62, OPA-134 and the AD822.
