Keymaster

As part of our ongoing series of approaching common utilities from a different angle, we felt it was time to address a gap in our ever-expanding case: Gate-to-trigger conversion.

Keymaster (borrowing from traditional compressor terminology to make the joke work), consolidates a few gate-related utilities into a single module: Input a gate and get both a trigger pulse and a variable-width gate; Input a trigger and get a copy of the trigger and a gate (also with variable width control).

It also includes a comparator-based “variable input”-to-gate conversion to convert LFO or envelope signals into gates, with normal and inverted outputs.

Finally, Keymaster can be paired with our Gatekeeper module to usher in the arrival of our overlord, Gozer the Gozerian to generate gate patterns for controlling multiple devices with rhythmic, repeating gate signals.

Schematic

As with any schematic found on the internet, exercise caution when building. Test the build before plugging it into your case. If you find mistakes in the schematic, or you have recommendations for improving the design, feel free to contact us and let us know.

BOM

Multiple all components by the number of channels in your build

• Capacitors
  • 100nf (1) C1
  • 1uf (1) C2
• Resistors
  • 1k (5) R4, R7, R11, R17, R18
  • 3.9k (4) R3, R6, R15, R16
  • 10k (4) R2, R5, R12, R14
  • 100k (5) R1, R8, R9, R10, R13
• Potentiometers
  • 250k (1) RV1
  • 500k (1) RV2
• ICs
  • CD40106 (1) U2
  • TL072 (2) U1, U3
• Diodes
  • 1N4148 (4) D1, D3, D5, D6
• LEDs (4) D2, D4, D7, D8
• Audio jacks (5) J1, J3, J4, J5, J6
• Switched audio jacks (1) J2

Demos

Coming eventually