Boing! Discrete Transistor Low Pass Gate
The Boing! is a Light Dependent Resistor-controlled low pass filter. It takes its primary inspiration from ultra-simple yet delightful passive Vactrol Low Pass Gate modules such as the PassiVac and DPLPG, but adds JFET transistor input and output stages and an active LED control circuit, thus enabling the introduction of wonderful Feedback and Trigger functions, LED brightness offset, and a second filter stage. Combined, these features allow for incredible variable-cutoff overdrive and low pass filter sounds in addition to bouncy LPG Bongos and more.
“Received the Boing & it's great! Figured I'd be using it for normal LPG stuff, but a big bonus is the huge range of voltage controlled overdrive sounds! Mild fattening to full-on gnarly brutality but always with a warm, natural, organic sense. A lower input signal softens it up while still having plenty of gain to compensate. It's my new secret weapon like this: 1vco > Boing! > vcf > vca. Gotta try it in front of the Marsupial or Macropod. Huge!” -Len R.
Current draw: 12mA @ +12V, 0mA @ -12V
Eurorack width/depth: 4hp; 28mm
4U width/depth: 1”; 28mm
BOM changes since initial release:
R7 changed to 47k (was 10k) - increases input impedance
R19 changed to 4.7k (was 10k) - increases Hit! input sensitivity
RFB1, RCV2 can be B50k or B100k
updated 12/26/21