Eurorack Module Tester (Assembled)

A comprehensive testing and signal generation tool for Eurorack modular synthesizer systems. This assembled unit provides multiple channels of signal generation and analysis capabilities in a compact black acrylic case. Settings reference included.

Key Features

• 4 channels of signal generation: clock, gate, CV (LFO or stepped notes), and audio
• 2 channels of signal analysis: audio signal frequency measurement (with display in Hz, Note units, or intervals), and gate/clock timing measurement
• Black acrylic case
• Settings reference included
• Fully assembled and ready to use

Technical Overview

• Clock signal generator with adjustable tempo, resolution, pulse duration, and MIDI control
• Gate signal generator with period and pulse control, MIDI support for gate and trigger modes
• Control Voltage generator with multiple waveforms (triangle, square, ramp up/down, sine, arpeggios, chromatic scale)
• Audio generator with 4 waveforms (saw, square, triangle, sine) and envelope shaping
• Audio input with frequency (Hz), note (MIDI + cents), and interval measurement capabilities
• Gate input with period, frequency, tempo, duty cycle, and pulse duration display

Connectivity & Power

• 12V AC external power supply required (2.1mm jack, wall-wart)
• Red stripe of ribbon cable indicates -12V pins
• Half-wave rectification design
• Maximum recommended current draw: 200mA per supply rail

Clock Signal Generator

• Tempo: adjustable in beats per minute
• Resolution: number of clock ticks per beat (e.g., 120 BPM with 8 ticks/beat = 960 ticks/minute or 16 Hz)
• Pulse: duration or duty cycle of clock pulse
• MIDI: external computer or sequencer control

Gate Signal Generator

• Period: signal period control
• Pulse: duration or duty cycle of gate pulse
• MIDI: external keyboard control with gate mode (signal is high when key is pressed) and trigger mode (pulse emitted on key press, irrespective of note duration)

Control Voltage Generator

• Mode: triangle, square, ramp up, ramp down, sine, 1 octave arpeggio (alternates between 1V and 2V), 2 octave arpeggio (alternates between 1V and 3V), chromatic scale (goes from 1V to 2V by 1/12V increments)
• Period: controls the period of the generated signal or sequence
• Range: controls amplitude and polarity - bipolar signals (2V, 4V, 10V amplitude) or unipolar signals (1V, 2V, 5V amplitude); ignored in arpeggio/scale modes
• MIDI: voltage control via MIDI message from external keyboard

Audio Generator

• Shape: saw, square, triangle, sine wave
• Frequency: fixed frequencies and musical notes
• Envelope: gate mode (signal on when Gate In is high) and trigger mode (decreasing envelope retriggered on Gate In rising edges)
• MIDI: keyboard playability

Audio Input

• Frequency measurement (Hz)
• Note and detuning (MIDI standard + cents)
• Interval measurement in cents (1 octave = 1200 cents) between current and previous stable notes

Gate Input

• First line: period, frequency, and tempo of incoming signal
• Second line: duty cycle or positive edge duration
• Gate Input LED blinks with input signal