Mr EQ

This project comes from guys at RunOffGroove.com and offers 12 different sounds with three switches. Each switch is assigned to one frequency peak: 100Hz, 700Hz and 2.1KHz. Bass and Treble switches provide 7db boost when activated and Middle switch can also do 7db cut. This is very useful for guys who like scooped mids and it offers two different modes: with both Bass and Trebble off it gives mild scoop, but with Bass and Treble on and Middle cut it gives more dramatic mid scoop. Very handy…

Mr EQ

I decided to go with perfboard based on official layout. Since I don’t need to switch it all time bypass switch is ommited and I placed everything inside very small plastic enclosure about 8x5x3cm. To avoid interference I shielded inside of enclosure with aluminum foil.

Voltage reference

Voltage reference
Input
8.7V
CD4049UBE
#1
4.7V
#2
2.2V
#3
2V
#4
4.6V
#5
0V
#6
2.2V
#7
2.2V
#8
0V
#9
2.2V
#10
2.2V
#11
0V
#12
4.7V
#13
30mV
#14
2.2V
#15
2.2V
#16
0V
Useful links

RunOffGroove.com Mr. EQ article

Comments
5 Responses to “Mr EQ”
  1. Manfre says:
    30/06/2017 at 05:50

    hi, I’ve made one, but doesn’t pass any sound.
    The source is giving 9.04v but voltages that you rated at 2.2v in mine is 1.9v, the 4.7v in mine 4.45v.
    What should I check?

    Reply
    • bancika says:
      30/06/2017 at 09:34

      Hard to tell. Debugging issues is the most important and hardest part of building pedals and amps.

      Reply
  2. Ryan says:
    18/07/2013 at 14:56

    Hello…Great stuff!! thank-you. Quick question though…Where can i get the parts to assemble a Mr EQ just as you have here?
    Thanks again

    Reply
Leave A Comment

  • About

    The idea behind this site is to share my experience with Do It Yourself approach to guitars, amplifiers and pedals. Whether you want to save a couple of bucks by performing a mod or upgrade yourself instead of paying a tech, or want to build your own piece of gear from scratch, I'm sure you will find something interesting here. Also, this is the home of DIY Layout Creator, a free piece of software for drawing circuit layouts and schematics, written with DIY enthusiasts in mind.