analog optocoupler filther

Features

• Unique analog two pole circuit with custom optocouplers fed directly in the feedback path.

• Two step controls and individual CV inputs on frequency and resonance for precise sound sculpting.

• Dedicated potentiometer for the total amount of feedback.

• A performance-oriented momentary switch for extra distortion.

• Two expressive touch points to make your body interact with the circuit.

• Rhythmically oriented accent CV input.

• Two outputs – a smoother LP and an aggressive notch.

• Works with audio and CV sources.

• Single board design – extremely skiff friendly.

• “Whatever” power connector a.k.a. don’t mind the polarity.

Technical Specs

• width 8HP

• depth 18mm

• 45mA +12V

• 25mA -12V

GOBLET is an analog filter and distortion unit with some added quirks and extra controls.

Start with both faders - frequency and resonance - at maximum, turn the trimmers fully clockwise and set the feedback pot at 0. Now insert an input and take the output either from the lowpass out or the notch out.

Start to turn the frequency trimmer until the resonance kicks in. Now adjust the resonance trimmer to your taste. The faders now have full range of responsiveness.

Adjust the feedback and start the filthering.

Note that This procedure is not mandatory at all – take it as a shortcut to understand how this filter works and how all the blocks are interconnected and weighted

For extra distortion interact with the two touch plates and the central momentary button.