Crustacean

The RMA Crustacean is an analog noise source. Several variants exist, many of which are only built by request.

The root of the Crustacean can be broken down into three primary sections: white noise, a fixed filter low pass rumble, and an operational amplifier based pop & crackle section with variable intensity. The following noise source only models are available:

crustacean_brick
The Crustacean “Brick” simply provides an output jack for each of the three noise sections and a rotary control to dial in the crackle density. It operates on a 9 volt negative tip power supply.

rma46
The “classic” Crustacean essentially replaces each output jack with a volume control and mixes all three signals down to a single output jack. Additionally, a power switch and indicator LED are standard. Depicted here is an additional toggle switch that defined range of the low pass rumble section, the current revision of the Crustacean does not utilize the earlier range circuit, so second switch function can be by request or omitted entirely.

Additional modifications of the classic Crustacean include the following options:

  • Momentary power button (interrupts power when power toggle is on or delivers power when power toggle is off)
  • Additional outputs (post mix or before volume control with option to use switching jack to remove affected channel from mix)
  • Audio input

Audio input opens the doors to use as an erosion processor. Currently the main approach is to mate a Tetanus Booster circuit with a Crustacean circuit in a Chimera like build; these are referred to as the 1v3 spec Crustaceans. Version 1.4 (1v4) was designed to do away with the separate circuit boards needed for an audio processor Crustacean, yet the 1v4 proved inconsistent and unreliable in production and have since been phased out.

1v3 are built to order, contact for details.

:: Historical anomalies of the RMA Crustacean ::

Early (non 1v4) units require 12 volt power in order to operate as intended, operation on a 9 volt supply will only cause disappointment, not harm. As of ~ serial number RMA110 the voltage peculiarities of the 1v3 have been designed out and operation on standard 9 volt negative tip is supported.

1v4 units utilized a DC power boost circuit in order make 12 volts while operating on the standard 9 volt supply. Therefore 12 volts is not recommended on a 1v4. Confused yet?

Identifying the 1v3 and 1v4.

1v3 range from a five knob variant of the classic box pictured above to more involved constructions like this:

rma82

The above pictured unit on a yellow background wants 12 volts.

1v4 are generally more symmetrical regarding control layout, like this:

1v4

The above pictured unit on a grassy background wants 9 volts.

If in doubt, make contact and I’ll be happy to address any questions.