L-1 Triple Discrete Midside/Stereo VC Equalizer/Resonator

IN STOCK

Based on Discrete Blacksea gain cells (18 total).

36HP

The device has 3 modes:

Dual mono. When left and right halves act as independent 3-band equalizers/resonators.
Midside. When left side controls MID, right side controls SIDE.
Stereo. When left side knobs control both sides. Switches - no. So you should to switch right side switches in the same positions as left side switches to have identical response from both sides. Right side knobs are disconnected in this mode.

Two blocks of three parametric bandpass filters each with full voltage control connected in parallel. Six filters total.
Two main modes selectable by switch - Equalizer (when input signal is presented at the output), and Resonator (when input signal is not presented at the output).
Switchable to low-shelf on first channel, and to hi-shelf on second channel.
Switchable to selfoscillation mode via DIP-switches. For v/oct trimming.
Overload LED help to avoid clipping.
Bipolar level control. +-16dB, CV range +-5V.
Bandwidth control 0.5...24 semitones. CV range +-5V.
Frequency control 10 octaves. CV range 0...10V.
Power consumption: +12V 274mA, -12V 267mA.

Paypal: info(at)greenexpo.by

Assembled module: silver panel $980, black panel $990 + $30 shipping.

SAMPLES:

Photos:

PLOTS.

The device consists of two blocks. Each block has three band-pass filters. Every band has independent controls (with a knob and CV input) on Frequency, Bandwith, and bipolar Level. Also CV inputs for master control all bands.

Dual Mono / Midside / Stereo switch.

Dual mono. When left and right halves act as independent 3-band equalizers/resonators.

Midside. When left side controls MID, right side controls SIDE.

Stereo. When left side knobs control both sides. Switches - no. So you should to switch right side switches in the same positions as left side switches to have identical response from both sides. Right side knobs are disconnected in this mode.

Equalizer/Resonator switch is for switching between two main modes. Equalizer mode works as average equalizer - boosts (with positive Level) or cuts (with negative Level) frequency bands from input signal.

Resonator mode works as band-pass filters. It boosts frequency bands with positive Level, and inverts frequency bands with negative level.

Frequency knob controls 10 octaves from 16 Hz to 16 kHz. Frequency CV inputs are 1V/oct.

Bandwith controls width of frequency band from 0.5 to 24 semitones at -3dB from the peack level. CV input from -5V thinnest to +5V thickest.

Level is bipolar. Zero at the center, right side positive, left side negative. Boosts or cuts 16 dB at each channel. Response curve is semi-exponential, as in mixers.

Overload LED lights when output signal amplitude exeeds 11V - it is much higher than 5V modular level, signal really clips, make less level or frequency.

Band/shelve switches from band to low-shelf filter at first channel, and to high-shelf filter at fourth channel.

Oscillation switches turn on resonance loop, and switch a channel into selfoscillation if thin Bandwidth and max Level. It's for checking frequencies and v/oct trimming.

Equalizer mode, BW - min, Level - max pos, Frequencies at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Volts CV.

Resonator mode, BW - min, Level - max pos, Frequencies at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Volts CV.

Equalizer mode, BW - min, Level - min neg, Frequencies at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Volts CV.

Resonator mode, BW - min, Level - min neg, Frequencies at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Volts CV. Signal is inverted.

Equalizer mode, BW - middle, Level - max pos, Frequencies at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Volts CV.

Equalizer mode, BW - max, Level - max pos, Frequencies at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Volts CV.

Equalizer mode, Level - max pos, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV.

Equalizer mode, Level - min neg, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV.

Resonator mode, Level - max pos, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV.

Resonator mode, Level - min neg, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV. Signal is inverted.

Equalizer mode, Low shelv boost. Level - max pos, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV.

Equalizer mode, Low shelv cut. Level - min neg, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV.

Equalizer mode, High shelv boost. Level - max pos, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV.

Equalizer mode, High shelv cut. Level - min neg, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV.

Resonator mode, Low shelv boost. Level - max pos, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV.

Resonator mode, High shelv boost. Level - max pos, Bandwidth at -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 Volts CV.

Equalizer mode, BW - middle, frequency 1 kHz, Levels at 0, 1, 2, 3, 4, 5 Volts CV.

Equalizer mode, BW - middle, frequency 1 kHz, Levels at 0, -1, -2, -3, -4, -5 Volts CV.

Equalizer mode. Mixing result from all four bands is obviously. here two bands with full positive Level, two other bands with full negative Level.

Equalizer mode. Four bands with positive Levels. Yellow - result.

Resonator mode. The same four bands with positive Levels. Yellow - result.

Equalizer mode. Make red band full negative Level, other three bands with positive Levels. Yellow - result.

Resonator mode. The same. Make red band full negative Level, other three bands with positive Levels. Yellow - result.

Resonator mode. The same. Make blue band wider.

Resonator mode. Green bands full negative Level, Red bands with positive Levels. Yellow - result.

The same in Equalizer mode: