On Board guitar pre/active electronics...

[Minion]

Hi Folks....I have been wanting a bit more drive out of my guitar but without haveing to deal with a pedal and such so I came up with this very simple Pre amp that is small enough to easilly fit inside most guitars ....It adds quite a bit of boost without adding any noise and has a bit of crunch at full Volume and the Highs really seem to cut through, It allmost adds a bit of tubesque sound to my solid state amp....I used a OPA137 opamp with a gain of about 22x it has minimal parts count and the PCB is only 1.52in x 0.97in ,You can adjust the gain by changing the 100K resistor and you can get a different tone by screwing with the values of the input and output Caps and the feeback cap....You could even put your guitars Volume pot in the feedback loop to adjust the Gain.....





Cheers

[DiamondDog]

Good work! 

And don't forget the Tillman fet preamp and phantom powered in-cable preamp too. Note a couple of "what I would do next times" at the end- increase the +v and try different FETs.

[Mark Hammer]

Read the article I wrote in 1979 here: http://hammer.ampage.org/files/Device1-12.PDF

You may want to trim back on the gain.