NLC Nonlinear Circuits Tin Teardrop VCF

NLC Tin Teardrop VCF

• 8 hp, White Panel
• Fresh build, tested, and fully functional
• Reverse power protection installed, comes with power cable
• Built with highest quality WQP-518MA jacks (20k+cycles)
  

Further information from nonlinearcircuits:

This VCF uses two SSI2144 chips, which are based on ladder filters. It has outputs for each chip and a mixed output. Controls include the usual cutoff and voltage-controlled Q, along with ‘spread’ controls for cutoff and Q. If nothing is patched into the spread controls, the spread pots work as manual controls. So keep them on or close to zero if you don’t want any or much spread.

The spread controls work best with a bipolar CV (as in ranging from -5V to +5V), an inverted version of the spread CV is sent to filter core 2, so it changes in the opposite direction to core 1. The spread controls are meant to be a bit less influential than the main 1V/oct CV inputs, in tech terms it is approx. 1V per 2 octaves.

So, I guess it is a stereo filter in some respects, tho it was never really the intent.

USE:

‘In Wet/Dry’ socket feeds to the switch of the ‘In wet’ socket, so you can process one

signal. If you want to pan between different signals, patch the signal to get the

reverb treatment into ‘In Wet’ and the other signal into ‘In Wet/Dry’. Make sure the

attenuator pots are turned up.

Feedback can be CV controlled or set with a pot. It will slowly but easily self-

oscillate, so be careful with it. The Feedback circuit has a simple low pass filter

that means it will tend to self-oscillate at around 200Hz.