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Psychedelic Voltage Processor

Quad LED Chaos User’s Manual - Eurorack

Hello and thank you for using the Psychedelic Voltage Processor for Eurorack, one of the first

collaborative modules from SetonixSynth and Tidbit Audio. We hope you will find its fluctuations most

pleasing!

The Psychedelic Voltage Processor, or PVP, is a four-channel chaos module. It uses color-changing LEDs

to produce fluctuating voltages in response to the Channel input, with each channel normalized in series

to create increasingly chaotic “taps” that can be used one after another for different variations.

Any positive voltage input such as unipolar LFOs, envelopes, stepped voltages, or simply the onboard

normalized voltage patched to a channel input is reproduced approximately on each channel output, with

the PVP inducing unpredictable fluctuations due to the variable current consumed by an LED circuit with a

mind of its own.

Technical Specifications (Eurorack standard)

Width: 8hp

Depth: 25mm

Peak Current Draw: 135mA @ +12V, 10mA @ -12V

Input Impedance (Channel 1): 150kΩ

Input Impedance (Channels 2-4): 100kΩ

Output Impedance (All Channels): 1kΩ, DC Coupled

1. Connecting your Psychedelic Voltage Processor

Before using the PVP, take extra note of the Peak Current Draw spec above. This module’s current draw

from the +12V rail depends largely upon the brightness of the LEDs and is continuously variable, but will

reach 120-135 mA on occasion. As such, it’s a good idea to double check that your Eurorack power

supply has at least this much current to spare at all times, or ideally a larger amount such as 250mA to

spare.

Connect a 10-to-16 pin ribbon power cable to the header at the top of the Psychedelic Voltage Processor

pcb. The -12V/red stripe side of the connector must be aligned with white stripe silkscreen indicator

labeled “-12V” for proper use. If your PVP has a shrouded power header, this will prevent you from

plugging it in the wrong way, so do not modify it. This module is reverse voltage protected, but it is still not

recommended that you plug it in backwards to see what happens.

2. Theory of Operation

The PVP began life as an active adaptation of the Tidbit Audio Random CV Processor. It uses similar

LEDs to those found in the Random CV Tidbit to create a chaotically fluctuating voltage signal that is

related to the input voltage, but utilizes the Eurorack format to expand on this circuit’s ability to provide

chaos and also create a visually-pleasing “window” with the panel of the module for viewing the workings

of the module. With this design, we hope to retain the original Tidbit’s minimalist appeal while also

creating something new and uniquely useful.

The Input/Output routing scheme of the PVP is designed to encourage messing around and happy

accidents, but there are just a few things to keep in mind while patching:

- The PVP responds to and processes positive input voltages only; negative voltage inputs are

ignored. It will also not output any voltage below 0V, and will act as a “half wave rectifier” on any

signal that would otherwise drop below this level. For example, a +/-5V input signal will be

processed into an approximately 0-5V “chaotic” output with the waveform’s bottom half “clipped”

at 0V. Most audio signals in Eurorack are centered around 0V, so if fed into the PVP without any

additional offset the signal’s bottom half will be clipped. (Note: this sounds cool!)

- The input of each Channel is normalized to the prior channel’s output (except Channel 1’s input,

see below). If a signal is patched to a Channel input, the normalization from the prior channel will

be broken and the Channel in question will process the input signal only.

- The Upper Knob is a simple unipolar attenuator for Channel 1’s input normalized to a static

voltage. If anything is patched to the input of Channel 1, the knob will act as an attenuator for this

signal. If anything is patched into the inputs of Channel 2 onwards, the normalization from

Channel 1’s output is broken and the knob will have no further influence over other channels.

3. Summary of Functions

Front Panel: LED circuit visualizers. Each Channel’s LEDs “steal” current from one another to create an

unpredictable chaotic voltage which the PVP utilizes for your patching pleasure.

Upper Knob: Input signal level attenuator for Channel 1. With nothing patched to the Channel 1 input, a

10V static voltage is normalized to the input and the Upper Knob thus controls the level of the voltage

sent to Channel 1, from 0-10V. Patching a cable to Channel 1’s input will interrupt the normalized voltage

and the Upper Knob becomes an attenuator, with the input signal to Channel 1 “muted” when fully CCW

and at Unity Gain when fully clockwise.

Channel 1 Input: The module’s “Master” CV input in a sense. Any signal patched to this input will be

attenuated by the Upper Knob before being processed by Channel 1 along with any other Channels for

which normalization is maintained.

Channel 2-4 Inputs: Non-attenuated direct CV inputs for each LED processor Channel. A signal patched

to one of these Inputs will interrupt the normalization from the preceding Output and be processed directly

by the corresponding channel. With nothing patched, these Inputs receive their signal from the previous

Channel Output, and using more Channels in a row to process a signal will lead to a more chaotic output.

Channel Outputs: Signal outputs for each of the four processor Channels. Positive input voltages fed to

the corresponding Channel input are processed chaotically and reproduced on the output, which will

generate an unpredictable, fluctuating output voltage that somewhat tracks the input between 0V and 10V

but will deviate in either direction. An input of Ground/0V generally causes low-level chaotic fluctuations

near 0V on the Channel output, while negative voltage inputs will lead to an output of 0V that does not

fluctuate much, if at all.

5. Calibration

Calibration of the PVP is easiest with an oscilloscope, but can be accomplished with a Multimeter as well.

- Patch a unipolar (aka, positive voltage only) low-frequency variable CV source such as a looping

envelope or slope generator (ideally 0-10V but 0-5V or 0-8V will work too) to the Channel 1 Input..

Use your oscilloscope to monitor the voltage range of the input, or make a note of the range if

using a multimeter.

- Turn the Upper Knob fully clockwise and monitor the first Channel Output. Adjust the top rear

trimmer so that the range of the Channel Output roughly tracks the voltage of the input, with the

output neither spending too much time at exactly 0V nor going more than about 500mV above the

original input level. (Note there will be variations between cycles as it is a chaotic module.)

- When you are satisfied, patch the same input signal to the Channel 2 Input and monitor that

Channel output. Repeat the prior rear trimmer adjustment directions, but for the second trimmer.

- Repeat this process for Channels 2, 3 and 4.

Produktspecifikationer

Varumärke:	SetonixSynth
Kategori:	Inte kategoriserad
Modell:	Tidbit Audio

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