joranalogue/collide-4
Collide 4
Fully analogue quadrature spectral computer based on the lock-in amplifier concept. Features a pingable variable-bandwidth bandpass filter with self-oscillation, a through-zero sine/cosine quadrature oscillator, a Hilbert transform network, dual ring modulators with output lowpass filters, and an extensive output section including magnitude and phase analogue computing outputs.649
Capabilities 5
- Frequency Shifterfrequency-shifter
- Frequency shifting is achieved by enabling the Hilbert transform (Δ90° switch position) and listening to the X'+Y' or X'−Y' sum/difference outputs. The oscillator sets the shift amount; symmetry knob transitions between up and down shifting through zero.649
- Lock-In Amplifierlock-in-amplifier
- Dual-phase (quadrature) lock-in amplifier with magnitude and phase polar converter outputs. Can perform actual lock-in amplitude and phase measurements of weak signals.649
- Ring Modulatorring-modulator
- Two precision analogue multipliers (4-quadrant / bipolar VCAs) for synchronous detection. Normalled from input section and oscillator; can be overridden via patch cables. Followed by lowpass filters with selectable time constant.649
- Through-Zero Quadrature Oscillatorquadrature-oscillator
- Through-zero sine/cosine quadrature oscillator (I and Q outputs). Operates in VCLFO or VCO range. 1 V/octave exponential FM and through-zero linear FM inputs with paired polariser knobs.649
- Variable Bandwidth Filtervariable-bandwidth-filter
- Temperature-compensated variable bandwidth bandpass filter with self-oscillation capability. Can serve as a sine wave VCO when self-oscillating. Pingable via the Ping Input.649
Jacks 21 — 12 in / 9 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (12) | |||
| + Input | audio | — | Positive differential AC-coupled input to the preamplifier. The preamp input signal is the voltage difference between the positive and negative sockets.649 |
| - Input | audio | — | Negative differential AC-coupled input to the preamplifier. The preamp input signal is the voltage difference between the positive and negative sockets.649 |
| Filter Centre Frequency CV | cv | — | Modulates the filter centre frequency at 1 V/octave. Temperature compensated for accurate pitch tracking.649 |
| Filter Resonance CV | cv | ≤5V | Modulates filter resonance; +5 V corresponds to maximum resonance.649 |
| Filter Width CV | cv | — | Modulates the filter bandwidth at approximately 1 V/octave.649 |
| Gain CV | cv | — | Modulates the filter output gain at 12 dB/V.649 |
| Oscillator Exponential FM CV | cv | — | Exponential FM input for the oscillator at 1 V/octave in audio mode; sensitivity is approximately 0.66 V/octave in low frequency mode.649 |
| Oscillator TZFM CV | cv | — | Through-zero linear FM input for the oscillator. The paired knob is a polariser setting modulation depth and direction.649 |
| Ping Input | trigger | ≥3V | Transient generator trigger input. A rising edge above +3 V strikes the filter to produce a percussive ping sound.649 |
| Time Constant CV | cv | — | Modulates the detector output lowpass filter cutoff frequency at approximately 1 V/octave.649 |
| X Balanced Modulator Input | audio | — | Input to the X balanced modulator (ring modulator). Normalled from the input section; can be overridden by patching a cable here.649 |
| Y Balanced Modulator Input | audio | — | Input to the Y balanced modulator (ring modulator). Normalled from the input section and oscillator; can be overridden by patching a cable here.649 |
| Outputs (9) | |||
| Difference Output | audio | — | Difference (X'−Y') of the two detector outputs. In frequency shifter mode with Hilbert enabled, provides the opposite direction of frequency shift.649 |
| I Output | audio | — | In-phase sine wave output of the quadrature oscillator; low-distortion 10 Vpp sine wave.649 |
| Magnitude Output | cv | — | Pythagorean magnitude of the (X', Y') vector. Always positive voltage; computed as sqrt(X'^2 + Y'^2). Represents total detected signal amplitude regardless of phase.649 |
| Monitor Output | audio | — | Output of the input section (preamp + filter + gain VCA) before the balanced modulators. Analogous to the monitor output on lab lock-in amplifiers.649 |
| Phase Output | cv | -10V to 10V | Arctangent phase angle of the (X', Y') vector. 18°/V scaling, full 360° coverage, range −10 to +10 V. Note: output may switch rapidly between extremes at 180°.649 |
| Q Output | audio | — | Quadrature (cosine) sine wave output of the oscillator; 90° phase shifted relative to I, low-distortion 10 Vpp.649 |
| Sum Output | audio | — | Sum (X'+Y') of the two detector outputs. In frequency shifter mode with Hilbert enabled, provides one direction of frequency shift.649 |
| X' Output | mixed | — | Direct output of the X channel detector lowpass filter. In lock-in use, represents the in-phase component of the detected signal.649 |
| Y' Output | mixed | — | Direct output of the Y channel detector lowpass filter. In lock-in use, represents the quadrature component of the detected signal.649 |
Parameters 16
| Name | Type | Range | Behavior |
|---|---|---|---|
| Filter Centre Frequency Knob | knob | 22Hz – 22000Hz | Sets the centre frequency of the variable bandwidth bandpass filter in free mode. In track mode, the filter follows the oscillator frequency.649 |
| Filter Gain Knob | knob | 0dB – 60dB | Post-filter gain VCA. Primary goal is to provide a strong undistorted signal to the detector; can also be pushed into clipping for post-filter overdrive.649 |
| Filter Resonance Knob | knob | — | Controls filter resonance via a feedback path. At sufficient width and resonance, self-oscillation is achieved turning the filter into a sine wave VCO.649 |
| Filter Width Knob | knob | — | Sets the bandwidth of the variable bandwidth filter. At minimum, a narrow 2-pole bandpass; at maximum with centred frequency, spans 22 Hz to 22 kHz.649 |
| Free/Track Switch | switch | — | In 'free' mode the filter centre frequency is set independently; in 'track' mode it follows the quadrature oscillator frequency.649 |
| Gain Modulation Knob | knob | — | Bipolar polariser knob setting the modulation depth and direction of the gain CV input at 12 dB/V.649 |
| Hilbert Transform Switch | switch | — | X=Y bypasses the Hilbert network (both balanced modulators receive identical signal). Δ90° enables the Hilbert transform, creating 90° phase difference between X and Y signals for frequency shifting.649 |
| Oscillator Coarse Frequency Knob | knob | 22Hz – 22000Hz | Sets the coarse oscillation frequency. Audio mode range: 22 Hz to 22 kHz. Low frequency mode total range: 2.8 mHz to 180 Hz (1 Hz with both knobs centred).649 |
| Oscillator Exponential FM Knob | knob | — | Polariser knob for the exponential FM input. Centre is 0 (no modulation); maximum is +1 V/octave and minimum is −1 V/octave in audio mode.649 |
| Oscillator Fine Frequency Knob | knob | — | Fine frequency adjustment for the oscillator. Range is 5% of the coarse knob setting (6 semitones in audio mode).649 |
| Oscillator Frequency Range Switch | switch | — | Selects VCLFO (low frequency) or VCO (audio frequency) mode for the oscillator. In audio mode, also AC-couples the TZFM input.649 |
| Oscillator Symmetry Knob | knob | — | Sets the symmetry/bias of the TZFM. At centre, the oscillator stops; movement in either direction provides asymmetric TZFM. At maximum or minimum, provides linear frequency control. Also useful as a frequency shifter direction control — smoothly transitions through zero.649 |
| Oscillator TZFM Knob | knob | — | Polariser knob for the TZFM CV input. Sets modulation depth and direction; inverts the CV signal when set in the left half of its range.649 |
| Preamplifier Range Switch | switch | -20dB – 30dB | Rotary switch adjusting preamplifier gain in coarse steps from −20 dB to +30 dB. Unity gain (0 dB) and 'off' (mute) positions included.649 |
| Time Constant Frequency Range Switch | switch | — | Selects the frequency range of the detector output lowpass filters. Audio mode: 22 Hz to 22 kHz. Low mode: 150 mHz to 150 Hz.649 |
| Time Constant Knob | knob | — | Controls the cutoff frequency of both detector output lowpass filters simultaneously. Turning down decreases the filter frequency (reversed from vintage lock-in convention). Range selected by the Time Constant Frequency Range Switch.649 |
Firmware history 0 versions
No firmware history recorded.
References 2
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[650]
Joranalogue Collide 4 product pageproduct_page● verified 2026-05-21