Description
Mörser is a 12HP stereo filter with shared frequency control (but separate resonance controls) for both channels. Each channel also has a dedicated distortion unit which, via a switch, lets you decide which output you want to have distorted (highpass, bandpass or lowpass). The distortion is heavy and thick just like one would expect from a DE module and there is no blend knob. It’s always 100% on. There are dedicated (non distorted) outputs for both lowpass and bandpass on each channel.
On the input side there are separate inputs on both channels with a gain knob for adjusting the incoming signal strength, this is not to be underestimated since the incoming signal strength strongly dictates how this circuit behaves. It’s highly recommended to experiment with the input knobs and play around with the loudness of the incoming signal a lot, no matter what outputs you are using.
In the middle of the module there’s a digital noise unit which is clocked. The tempo of this internal clock has been modded from the original version (see below) and is regulated via a potentiometer which goes from fast to clicks and cuts territory or “morse code” bursts. There is a dedicated noise output for using this noise with the rest of your system and other modules. The noise out is normalled to BOTH the cv input and the audio in on both sides. Making Mörser an awesome sound source on its own – capable of making rainforest sounds, morse code and sci-fi landscapes without any input signals. The left input is also normalled to the right input so you can create a stereo filtered signal with just one sound source. Morser is a first in a line of filthy filters named after 90’s Bremen hardcore bands.
Acknowledgements from Djupviks: This design draws heavy inspiration from the original WASP filter1 launched in 1978 so credit to EDP for that one. Inspiration was also taken from pretty much all available clones out there (CGS, Doepfer, Juergen Haible even Behringer!) The result leans towards the dirtiest, most unstable version of a wasp style filter, borrowing inspiration from all of the aforementioned while adding some Djupviks flavour as well. Ken Stone (CGS) “designed” the noise circuit (CGS39) but doesn’t want any credit or mentioning for it, I offer it here anyways since I owe Ken a lot for his amazing designs and help during my DIY years. Without him Djupviks would never have existed.
Note: this is a Panel & PCB set only – you must source the rest of the parts yourself!
All SMD parts are already pre-soldered
Mörser – Build Document & BOM
