Transistor Ladder Low Pass Filter
Nothing quite beats the comforting sound of multiple rich sawtooth's softened by a warm, squishy filter! tràigh is a classic transistor ladder low pass filter. (24dB/octave). Derived from classic East coast designs, the Tràigh is suited for creating fat, warm subtractive voices. With it’s built in 3 channel mixer, the design is optimized for summing multiple audio signals and softening them into a single warm, comforting cushion of sound.
The tràigh is based on classic discrete circuit designs pioneered by Moog in the 1970’s. The only op-amps used are at the mixer summing stage and for buffering the output signal. Everything else is transistors and fuzzy caps. The approach in sonic character is vintage through and through and if you ask us, it sounds great. Input signals will hit approximate unity level when channel faders are at the midway point. Increasing them will add gain in a soft wave-shaped manner. With resonance maxed out, the tràigh will self oscillate with a stable sine wave. With rich input signals, the resonance will tighten up the cut-off slope and accentuate overtones from a soft squelch to full blown formant madness when a touch of FM is introduced.
tràigh | traːj | noun (coastal tide) the rising and falling of the sea due to the attraction of the moon, to ebb, recede, settle, empty
• Transistor ladder circuit architecture 24dB/octave low-pass
• 1V/octave, Coarse and Fine cut-off frequency controls
• Linear FM with attenuator
• Output with master output level control
• 3 channel input mixer
In the Box
• The module itself
• Eurorack Power Cable