Nonlinearcircuits MACRAME | LOGORRHEA | VCF 1

video upload by cirtcele

"Macrame is a 6 channel mixer with voltage controlled level and panning. It uses two SSI2190 chips to do all the work.

You can use the SET pots to operate the level and pan manually, or use CV to get things moving around and up and down.

It has two synth level outputs, two line level ¼” jack outputs and a stereo line output (which works fine with most headphones too).

For some reason, probably because I was slightly askew on post-op painkillers when designing this, the panel is 21HP. I guess this means I need to release more odd HP modules to avoid gaps in cases."


LOGORRHEA

video upload by cirtcele

"Logorrhea is kind of a vocal filter; basically it is the back half of a vocoder crammed into 8HP. There are two inputs, 10 filter channels, a white noise channel and a thru channel, to feed thru the original signal(s). It uses two SSI2190 chips to do all the work.

There are no knobs.

To use, patch in one or two audio signals. Ones with lots of harmonics sound best, pulses, squares or wave-folder outputs, not sinewaves.

Patch in a bunch of CVs to set up your sounds, it expects 0-5V CV signals.

OUT is all channels mixed together.

OUT A is thru, LP (low pass), BP2, BP4, BP6 and BP8 (BP = bandpass).

OUT B is noise, BP1, BP3, BP5, BP7 and HP (high pass).

Using OUT A and OUT B in a stereo mixer (such as NLC Macramé) is nice with panning to move the sounds around."


FAST AND BULBOUS VCF
video upload by cirtcele

"This module uses the SSI2140 chip which is based on the SSM2040 VCF, tho with a few updates.

My first thought when I read the datasheets was that it would be great to design a module that could switch between a phaser and a VCF. Looking back at old SSM2040 designs, it seems most of the usual suspects (T. Henry, J. Blacet, C. Anderton et al) had much the same idea.

This module is based on Anderton’s design in Device 1-6 (yes, I spotted the error) with modifications to suit the SSI2140 and Eurorack.

There are 4 switches, one for each OTA stage, to select between (all pass (phaser) and low pass filter mode. You can have quite a lot of fun with 2-3 switches in one mode and 1-2 in the other.

There is a dry mix pot to mix the incoming signals into the OUT signal, which is taken from the 4th OTA stage. This is probably more commonly used in Phaser mode, but there are no rules, so do whatever you like.

POLES is a weighted mix of the outputs of each pole, it is a bit shy when all switches are turned to Low Pass but perks up very nicely when one or more switches turned to Phaser.

The SSI chip is a bit tight to solder, have your bottle of flux ready, otherwise it is a pretty easy build."