Synthesizers.com Q150 Transistor Ladder Filter

Controls

  • Frequency
    Manually controls the filter's cutoff frequency.
  • Resonance
    Manual control of the filter's resonance.
  • Frequency Level 1
    Allows adjustment of the cutoff frequency control input 1.
    This control also provides inversion.
  • Frequency Level 2
    Allows adjustment of the cutoff frequency control input 2.
  • Signal Input Level 1
    Allows attenuation of the input signal 1.
  • Signal Input Level 2
    Allows attenuation of the input signal 2.
  • Slope -12dB/-24dB
    Allows selection of -12dB or -24db slope.

Sockets

  • Frequency Control 1/2
    Voltage control of the filter's cutoff frequency.
  • 1 Volt/Octave
    Frequency Control
    Voltage control of the filter's cutoff frequency at a fixed 1V/Octave.
    Normally used to track the keyboard.
  • Signal Inputs (1/2)
    Signal to be filtered.
  • Low Pass Output
    Filtered output signal where high frequencies are attenuated.

Various

Synthesizers.com

The Q150 Transistor Ladder Filter is based on Bob Moog's famous design and provides incredible-sounding -24dB lowpass filtering which has become the standard of subtractive analog synthesis.

The cutoff frequency can be controlled manually and by control voltages from an envelope generator, oscillator, keyboard, etc. Frequency control signals can be attenuated and inverted without the need for utility modules.. Resonance (Q) of the filter can be adjusted with the front panel control. The filter will self-oscillate and track a 1V/Octave keyboard control voltage. Both -12dB and -24dB slopes are available offering a wide range of sounds. One pole and three pole responses are jumper-selectable for even more possibilities.

A convenient two-channel mixer is provided for incoming audio signals and can be deselected if identical behavior to the Moog ladder filter is desired. A special feature of the Q150 is output leveling. In most ladder filters the output signal level is greatly reduced as the resonance is increased. This usually requires resetting input levels (sometimes many) when changing resonance settings and can become quite annoying. Special circuitry in the Q150 maintains constant output level at various resonance settings while keeping the harmonic content unchanged. This feature is jumper-selectable and can be deselected if identical behavior to the Moog ladder filter is desired.

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