This circuit is from an old Mullard (Philips) manual with applications using the 555. Choosing appropriately the resistors and the timing capacitors, the ranges obtained can exceed days.
S-meter is a signal strength meter used in radio transmission. Also known as Strength meter, in this...
January 2017 - Atmel / Microchip's ATA8520 single-chip card for SIGFOX RF transceivers can be...
August 2016 - It can be obtained from Mouser Electronics new operational amplifiers with extremely low...