This circuit has a duty cycle of 50%. We found it in old English documentation. The center frequency is around 1 kHz.
SST OXY Flex Oxygen Sensor The purpose of this SST sensor is to measure oxygen level in enclosed...
The circuit shown, for reading perforated paper or the presence of paper, was suggested by...
Two sensors are used in this simple remote-control circuit, one to switch on and one to switch off the...