New, old Archer/Tandy stock LM565 Phase Locked Loop filter/demodulator integrated circuit with complete data sheet. The item is still in its original unopened packaging. The LM 565 can be used for frequency shift keying, in a modem, as a telemetry receiver, and as a tone decoder. It operates in the range 0.001 Hz to 500kHz and has a wide operating voltage range of plus/minus 6 volts to plus/minus 12 volts.