Programmed random time interval signalling device.

The device described in this note is an automatic means of producing audio signals at random time intervals, and was devised for a work-study project. The system used could be adapted easily for other purposes, for example to the automating of biological experiments requiring random stimuli for behaviour patterns, or to the random sampling of items on a conveyor belt. The system may be used with multichannel outputs and other parameters, e.g. the number of items or events can be used instead of time.