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Imprimir páginaTABLE OF CONTENTS
1 Project Overview
2 Introduction & Usage
INTRODUCTION
The Luna Optical Tremolo is a modified version of the 4ms Tremulus Lune, a classic DIY optical tremolo
circuit that allows fine-grained control over the LFO shape.
Several of the Tremulus Lune circuit's optional modifications are included standard in this PCB,
including the Symmetry control as well as an external gain adjustment control so you can achieve unity
volume with any setting.
The Luna adds a few improvements to the original design, including an input buffer to reduce noise and
some added filtering to counteract ticking from the LFO. All of the knobs are located on the front panel
in an efficient layout that is easy to build.
The new version of the Luna now uses standard 16mm potentiometers, which should make it easier to
source parts than the last version. It also now has the Rate LED integrated into the footswitch board.
USAGE
The Luna has the following controls:
• Rate is the speed at which the tremolo modulates.
• Depth sets the volume of the tremolo at the lowest peak of the waveform. You can turn it all the
way up for a choppy sound, all the way down for a clean boost with no modulation, or anything in
between.
• Symmetry allows you to adjust the position of the peak of the LFO in the cycle. On one end, there
will be a fast rise and a slow fall, like the attack of a piano. On the other end there will be a slow rise
and a fast decay, like a swell effect. The middle position is a normal tremolo sound with equal rise
and fall times.
• Smooth lets you set the shape of the LFO. On one end of the knob's range, it's a triangle wave. In the
middle, it's a sine wave, and on the far end it's a square wave.
• Spacing allows you to space out the LFO cycles. The width of the LFO pulse is the same, but there is
a delay between cycles-creating a unique effect that is very uncommon in tremolo designs.
• Volume sets the volume of the tremolo at the highest peak of the waveform.
LUNA OPTICAL TREMOLO
10 Licensing
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