Available as an assembled Module and as a DIY project.
This Module is currently available.
Transistor Ladder VCF
With simplicity and low cost being the main driving forces behind this module, it is made for absolutely everyone. This 4HP low pass filter is built around the classic transistor ladder design and has a unique character and an unpredictable nature, providing contrast to the near-perfect devices available in the sea of electronic music today. The occasional growl produced by pushing the resonance setting high is uncharacteristic for this type of filter, as are the harmonically rich timbres layered onto the sound by pushing the circuit to its limits with the gain setting. Its compact size and price make it a wonderful addition to your growing system.