The Random Voltage Generator produces random voltages which vary smoothly or in a step-wise manner. Random timing pulses are also available. The rate of change of all outputs is voltage controllable over a wide range. An internal noise source is included as a driver for the module or an extrenal source may be used as desired.
www.elby-designs.com/webtek/panther/panther.htm
Available as an assembled Module and as a DIY project.
No info about availability.