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.

http://www.elby-designs.com/contents/en-us/p906_ES01.html

• ? mA +12V
• ? mA -12V
• ? mA 5V

Available as an assembled Module and as a DIY project.

No info about availability.