Sundial
Work in Progress
Sundial is a dual oscillator, amplitude modulator (tremolo). Making use of two NE555 Timer ICs, the circuit outputs two oscillations (two white LEDs) which have been shaped differently. These oscillations are summed and power an LED (red). The audio input and output are connected in series through an LDR (light dependant resistor) - which has a high resistance when there is no light and low resistance when there is light. This causes the audio signal's volume to be modulated by the summed oscillation.
Having finished the prototype; circuit design, pcb and casing, I’m currently working on a second revision that now uses a Daisy Seed microcontroller. This will allow more precision, adaptability and functionality in the interface and actual effect.
Rev 2.0 will feature rotary encoders rather then potentiometers. This is an upgrade in tactility as I’ve always enjoyed the clicks of encoders more than the smooth turn of potentiometers. Most encoders add functionality without changing the form also. By pressing the knob from the top - rather than turning it, I’m going to allow users to switch each oscillators’ basic wave shape. In addition, RGB LEDs will be added for each knob. Colour will represent mode (which waveform is selected) and brightness will represent the main function of each knobs current value.
In terms of the casing, Rev 2.0 will be 3D printed at 100% infill. This means the clear filament will not have the square pattern for strength any longer as there will be no air gaps within the walls. While this does increase the amount of filament required per casing, it should dampen the light and allow it to spread more evenly.
The switch to digital will also allow for an easier implementation of a momentary footswitch. While this could have been integrated in the original with a simple latching circuit, Rev 2.0 connect straight to the microcontroller. This is another tactile upgrade as 3PDT footswitches have a very unsatisfying click. The footswitch will also be centred on the X-axis in future versions.
Sound Demo and Explanation:
This short demo video explains the core concept behind the effect. It was made during the early prototyping stage so some changes have been made. But the concept will hold true even once ported to the Daisy Seed on the second revision (just with added complexity).