SetonixSynth Boing! Manual

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Boing! Discrete Transistor Low Pass Gate User’s Manual

Updated November 2021

Hello and thank you for using the Boing! Discrete Transistor Low Pass Gate. We hope you will find its

tones most pleasing!

1. Connecting your Boing!

Use a typical 10-16-pin Eurorack ribbon power cable to connect the rear header of your Boing! to your

Eurorack case's power bus. The -12V (red stripe) side of the ribbon cable must be aligned with the white

silkscreen indicator stripe for proper use. This module is reverse diode protected, but it is still not

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

2. Theory of Operation

The Boing! Discrete Transistor LPG was conceived and designed with two things in mind: we loved the

sound of discrete transistor gain stages such as those found in the Moog CP3 and Buchla Model 106

mixers, and we also loved the sound of simple passive LPG modules such as the PassiVac and Meng Qi

DPLPG. Why not combine them?

Well, there are a few reasons! Given the advent and development of op-amps and OTA’s, transistors offer

a less precise and linear way to provide amplification or process Control Voltage, and Low Pass Gates

process the frequency spectrum less unevenly (low frequency will always pass through more than high)

than a modern “clean” amplifier.These circuits also operate between +12V and Ground, which is half the

headroom of an op-amp powered with a bipolar supply. If the amplified signal exceeds about +10V at any

stage, clipping will occur. Vactrols, or in this case LEDs facing Light-Dependent-Resistors, have a distinct

“lag” behind their controlling signal.

However, the ear hears what it likes, and it distortion, Vactrol lag, and the sound of filters openinglikes

and closing completely. Together with an inverted feedback loop which can tame some of the wilder

harmonics introduced by the various stages, these elements offer new ways to process sound, distinct

from other Low Pass Gate designs, and can consistently offer up new and exciting sounds each time it’s

patched.

The Boing! operates like a typical Low Pass Filter in most regards: it has one Audio Input and one Audio

Output, and the signal present at the Output will represent a modified version of the Input. The knob

labeled "Offset," Control Voltage present at the "CV In" jack (attenuated via the "CV Atten" knob), and

Triggers or Gates sent to the jack labeled "Hit!" will all influence the filter's cutoff frequency. Early builds of

this module will require a +10V gate or trigger to significantly “ping” the LED, while any built post-October

2021 will work well with +5V.

Negative control voltage can be used to influence the control LEDs as well in combination with the Offset

knob. Finally, the knob labeled "Damping" introduces a phase-inverted signal to the first filter stage which

changes the filter's timbre.

In the case of the Boing!, filtration is being done by one or two Light-Dependent Resistors configured as

Low Pass Filters, depending on the position of the Switch: "1-Order" indicates one stage of Low Pass

Filter, while "2-Order" indicates two stages. The LDRs determining the cutoff of each stage are controlled

Produkt Specifikationer

Mærke:	SetonixSynth
Kategori:	Ikke kategoriseret
Model:	Boing!

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