JonDent - Exploring Electronic Music: Kilpatrick

Showing posts with label Kilpatrick. Show all posts

Saturday, 18 July 2015

The αρπ Filter (alpha-rho-pi) with a kilpatrick Phenol

The αρπ Filter (alpha-rho-pi) of NLC sounds great. .... very much like the diode ladder used in the Roland TB 303

It's actually a hybrid/variation of the vintage Electronotes and ARP designs. Hard to describe it's sound ... inorganic, man-made (in a good way).

The filter design has 2 audio inputs, two CV modulation ins and two audio outs (Bandpass & LP).
I'm not aware of NLC's producing a Eurorack version of this great module. So for now, if you want one
you'll have to build athe 4U banana-fied panel .... it's well worth it.
http://nonlinearcircuits.blogspot.com.au/2012/10/filter-panel-ready-to-shipthis-one-has.html

As you can seen from the pics I'm using just the BP out & one in & one CV mod in.
The CV is being modulated from a jerkoff.

This is a old video using the αρπ Filter:

Kilpatrick Phenol & NLC Divine CMOS

This circuit uses some good old CMOS 4000 chips. To be specific they are 4070s although
the logic chip can also be a 4081, 4077 or a 4001.

[The CD4070 contain four independent (XOR) Exclusive-OR gates].
I understand that Andrew F is a fan of "Lunetta Synths".

The module takes two input signals and divides them down by /2, /4, /8 & /16.

It also ring modulates the two signals and all of their divisions (similar to the ring mods in the Korg MS-20 and ARP Odyssey). All of these signals can then be mixed to create the output waveform.

This is a early video of one in action with some Serge gear: