This signal amplifier for ATV in the 427 to 439 MHz band was found in a magazine 73 for radio amateurs of the 90's. The circuit is installed next to the antenna on the mast itself.
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...