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SKU

171930

Boredbrain Injectr Electric Guitar Interface Module

Fully-equipped electric guitar and bass interface for eurorack synthesizers featuring an overdrive-capable preamp, versatile amp simulator, and control voltage extractors
MFR# injectr

Product Description

The Boredbrain Injectr is a fully-equipped electric guitar and bass interface for eurorack synthesizers. The module features an overdrive-capable preamp, versatile amp simulator, and control voltage extractors designed to inject stringed instrument signals directly into the modular environment.

INSTRUMENT PREAMP

Injectr’s high-impedance instrument input, INST IN, feeds straight into a variable gain circuit which can produce a range of tonal responses, from clean to heavily overdriven. The smooth character of the DRIVE parameter is made possible by a soft-clipping topology using a classic 4558 op amp and four diodes, two silicon and two germanium.

A post-drive LEVEL control is provided to trim the output of the preamp stage, which is accompanied by a RED LED, indicating that the signal is reaching the typical eurorack audio level of 10 Vpp. Because stringed instruments tend to have strong transients, it is suggested to adjust the LEVEL control so that the LED is illuminated with moderate to heavy playing.

CV EXTRACTOR

Buffered directly from the instrument input is a responsive envelope follower circuit, which produces a control voltage signal at the ENV output jack based upon the input’s volume dynamics. The ENVELOPE parameter adjusts the sensitivity of the circuit, depending on how the instrument is being played. The adjacent WHITE LED is a visual indicator of the envelope follower’s output. The switch labeled SLOW MED FAST selects the follower’s response time, affecting both the rise (attack) and fall (release). An inverted copy (negative going voltage) is present at the ENV- output jack.

Additionally, a 0-5 V gate control signal is present at the GATE output jack, which is derived from the envelope signal and is indicated by the GREEN LED. The sensitivity of the gate extractor circuit is adjusted using the GATE parameter, and essentially sets the threshold at which the gate signal is triggered on and off.

AMP SIMULATOR

One of Injectr’s most useful features is the Amp Simulator circuit. Using a complex arrangement of analog filters, it imparts an amplifier-like quality to the signal.

The CHARACTER parameter alone can dramatically alter the sound, giving the user combined control over the middle “dip” frequency and bandwidth. The PRESENCE parameter adjusts the low-end response, thickening or thinning the overall tone, whereas the BRIGHT switch enhances high frequencies. In combination with pickup selection and tone controls of the guitar itself, these parameters provide a wide range of tones all while staying within the eurorack system. If preferred, the Amp Simulator can also be toggled off by disengaging the SIM ON switch.

FX LOOP

The module is equipped with a eurorack-level effects loop, FX SND and FX RTN, serving as an access point to process the signal after the Preamp/Drive circuit but before the Amp Simulator. It is also useful to process the signal with eurorack modules before taking the signal back out using the Line Out.

High-gain modules such as overdrive/distortion and intense compression may cause unwanted feedback in the FX Loop, and so are best patched after Injectr from the OUT jack.

OUTPUTS

The OUT jack provides a post-simulator eurorack-level audio signal, which is useful when it is to remain in the system to be processed or mixed with other signals.

The LINE OUT jack provides the same signal at line-level, which is suitable for sending the signal out to external gear, interfaces and amplifiers.

FEATURES:

  • High-impedance input for electric instruments
  • Preamp drive circuit with germanium diodes
  • Amp simulator with analog tone shaping controls
  • Envelope follower and gate voltage extractors
  • Dedicated eurorack-level FX loop
  • Eurorack and line-level audio outputs

Product Specifications

ConditionNew
Depth27 mm
ChassisModule
Module TypeEurorack
Module Slot Count11hp
Connector Type3.5 mm
Power Consumption38 mA @ +12; 30 mA @ -12V

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