Tremolo Device

Tremolo Device 1v1 – Building Docs

Tremolo Devise – Drilling Template 125b Expression pedal

Tremolo Device – Drilling Template 1590b

PLEASE NOTE: The Rate LED feature on this PCB does not work as intended. Installing this LED will result in the LFO stalling completely making the effect unusable. 

Project overview

Based on EQD, Hummingbird is a choppy, sawtooth tremolo modeled on the vintage “repeat percussion” capable of producing everything from classic “50’s style” shimmering tremolo to a synthy, delay-like chop that turns your signal into a burst of short pings and on through to near ring modulation.

Features the possibility of plug it into an expression pedal and an optional Rate LED-diode that can turn this EQD based pedal into the DBA territory!

Introduction

The people from EQD revisited another classic forgotten pedal, as is the Vox Repeat Percussion Tremolo, adding volume and depth control, plus the rate mod toggle that switches in between capacitors altering the behavior of the tremolo.

They also included the possibility of controlling the Rate with an external pedal.

For this layout, we have made a deep analysis of both circuits, the Vox and EQD version, to deliver the best possible version.

Both versions originally feature a 2N2646 transistor for the tremolo section; however, as this part is often hard to source, we made a little adaptation to work with the modern 2N6027.

We also considered the reports of many pedal builders about this project on different forums across the web where they were reporting a constant issue, the ticking of the LFO louder than the tremolo effect itself. To deal with this, we included a power filtering resistor and also replaced the low gain wn3904 for a high gain 2n5089 transistors.

Controls

• Depth
• Level
• Rate
• Rate mode Switch