K6501 PHILTER
User Manual
Download a PDF version of the manual here: K6501-philter-manual.pdf
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Introduction
The amazing success of the PHENOL Patchable Analog Synthesizer has definitely created a demand for some of the PHENOL aspects in the Eurorack
world. By popular demand we have released the K6501 PHILTER which is based closely on the filters found in PHENOL.
Setup
The K6501 PHILTER requires only +12V and -12V. Make sure you use a good power supply that is not overloaded. The voltages should measure as
close to +12V and -12V as possible.
To get something happening right away, just patch an oscillator signal into the SIG IN jack and take the output from the LP OUT jack. Vary the
CUTOFF control and check out the sound.
Jacks and Controls
Audio Inputs and Outputs
The SIG IN jack is the audio input for the module. This accepts a +/-5V (10V peak to peak) signal. Note that with high resonance the outputs may
produce up to +/-10V. PHILTER can produce three outputs at the same time:
LP OUT - Low-pass output - sounds at and below the cutoff frequency
BP OUT - Band-pass output - sounds centred around the cutoff frequency
HP OUT - High-pass output - sounds at or above the cutoff frequency
Each audio output jack has an LED which will light when strong signals are coming out of the jack.
Tuning
The CUTOFF control affects the resonant frequency of the filter. When resonating, the cutoff frequency setting will determine which sounds are
accentuated. Beyond this frequency the other signals will either be passed unchanged, or rolled off depending on which output you use.
The FM IN jack and FM LEVEL control are used to control the cutoff frequency from a control voltage. The FM IN jack responds exponentially to
control voltages from approx. -5V to +5V. Negative and positive voltages will add or subtract from the front panel CUTOFF control setting
accordingly.