DIY onboard bass preamp...

[Motifnick]

is possible to increase treble? Great job!

 

[mayoayox]

idk if rob mods is up to any of this stuff anymore, but ive been trying to figure out if it'd be advantageous to use a voltage regulator like the lm317 instead of a voltage divider.

 

[13ghosts]

Hi everyone. For my latest Project Berocca video I put together a simple 2-band preamp as a project you can build yourself...

Hi Rob,

Thank you for introducing the preamp here! I really appreciate it.

I came across it while looking for an active blend and am now considering building the preamp as well. I'm planning to use it to test a few things for tone control in my current projects.

You provided alternative values for the capacitors in the PDF for the preamp in order to change the centre frequencies of the tone control. I would be glad if you could help me out with a few values. I would like to have more options in the mid-range. Hence the following questions:

What values should the capacitors C3 and C4 have so that the centre frequency of the treble control is at 1.5khz and 800hz respectively?
What values should the capacitors C2 and C5 have so that the centre frequency of the bass control is 250hz and 500hz respectively?

Is it actually possible to influence the slope of the EQ curve with this type of amp (and if so, which parts should be adjusted)?

Thanks a lot in advance,
Thorsten