Thursday, November 1, 2018

DIY Ring Modulator and Some Dave Lum Tattoo Art

Original Circuit
Here's some creepy perverted stuff for your Halloween.  I finished up a pedal for a friend that I've made a few of at this point.  My take on Tim Escobedo's Push Me Pull You, Octave Fuzz.  I wrote about that a while back here: .  It's my favorite octave fuzz so far.  You can here it in action at the bottom track of this post.  My friend and I came up with the idea to call it the Paipan Fuzz.  Here in Japan that means basically what the graphics are on it, with no shrubbery.  And those graphics are from a tattoo my dad, Dave Lum did years ago.  He's a now retired well know tattoo artist with mind altering and twisted images.  You can take a walk down memory lane with him occasionally and see his old work here: . Word has it he's working with someone on a book of his work in the future.

Modified Circuit

The second pedal I did with Lum art was a ring modulator, again a modified Tim Escobedo circuit.  I always wanted a ring mod, but never got around to buying one.  Especially with the DOD Gonkulator prices skyrocketing.  So this was a must try.  It's not the most versatile ring mod in the world, but it will give you a bunch of crazy sounds.  I added a few extra controls to make it more usable for me.  First I replaced the original 10K resistor with a 100K potentiometer.  Between the two pots you can get more sounds.  I did get some harsh distortion even when my amp was clean on some settings, so I added a switch with a .0047uf cap ground which cut off some of the harsh high end frequencies.  Lastly I still wanted more control, so I added a wet/dry blend pot.  The simple wiring seemed to work just fine.  With this, you can almost get away with playing something pretty.   Here's a quick demo video I did of the pedal. Enjoy folks. 

Here's the Octave Fuzz in action at the 2:04 mark


  1. hi there ,
    from my experience the lm567 tends to malfunction at 9V.
    is the 100k resistor enough to protect it?
    in my builds i tend to add a 7805 voltage regulator to use it at 5V.
    i might be wrong , was curious if you had any bad experience with 9V.
    also might be the diference between lm567c and lmc567 (the former is harsher and self oscilates a lot and in general is les good for audio practices but is what i had mostly in the past , now i got some lmc567 and afraid i might burn them at 9v.

    1. Should check the spec sheets and see what voltage it can run. I actually can't remember if mine was a lm567c or not. I did get some high end noise which the output cap is taming. I will try to get to voltage reads and double check what I have when I have time.