This circuit can use a pendulum sensor. We found this configuration in a 1994 publication. The components used are common and the timing is given by the capacitor C1 which can be changed.
Found in old American documentation, this circuit is current as it uses the 555 to modulate an...
SST OXY Flex Oxygen Sensor The purpose of this SST sensor is to measure oxygen level in enclosed...
This circuit was originally developed in 1989 to allow the triggering of loads from audio signals...