This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is 1000 M ohm.
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...