PEDALPCB: Pendulum Harmonic Tremolo

I don't know much about the origins of this one, as PedalPCB don't seem to have listed any information on it (at least that I can find anyway).  

The Pendulum is a Harmonic Tremolo, meaning the signal is split in two paths, each with either a high or low pass filter; they're modulated separately and then summed back together for an interesting effect - not your average tremolo.

Link to schematic via the build document located here

Lower speed rate mod:  Replace the C50K pot with a C100k pot for a lower rate  OR  increase the value of the 4.7u capacitor.  Increasing the cap will reduce the max speed, which is probably not a problem for most people.

Here are the filter cutoffs for each side of the trem - keep in mind as one increases in level, the other decreases.  The output will certainly not look like this at any given time.   

PEDALPCB HARMONIC TREMOLO - VERO LAYOUT

ON THE BENCH

The screengrab wasn't behaving, so here's a quick and dirty shot from the phone.  I used a square wave for this, as a sine wave has no harmonics to demonstrate a harmonic tremolo….   You can see and hear the low-pass and high-pass filters alternating in and out.  

My homemade vactrols worked the first go too, which is always nice. 

I did end up moving the input cap a row on my build, as the pin spacing was wider than I thought.  A standard 1u box cap will fit just fine with the layout above.  I picked up a bunch of 63v 1u film caps recently that I wanted to use for this.  Apart from being orange and looking colourful, they are narrow compared to regular 100v 1u box caps, which come in handy for many layouts.  

PEDALPCB HARMONIC TREMOLO - VIDEO DEMO