Note: The Type 1 Liverpool Simulator has now been superseded by the Type 2 hardware.
Designs are available for an experimental simulator sensor based on a standard 38kHZ infra-red receiver IC. Schematics, Eagle PCB designs, firmware source code and full documentation are available on GitHub, and ready made PCBs are available from OSH Park. An experimental sensor of this type is currently installed at Liverpool Cathedral.
These sensors are aimed at experimenters, and are not expected to be widely adopted.
Experimental 38kHz Sensor
38kHz Sensor PCB
The Liverpool Ringing Simulator Project 