Infrared Receiver Circuit Diagram - In the mid 1970s large numbers of small FM transmitters, operating in the FM radio broadcast band (88-108 MHz) appeared on the market. It started with a self-build kit from the Danish manufacturer Jostykit that allowed everyone to build a small FM transmitter for a few Euros.. created 2008/03/16 last update 2010/01/28 ==> NEW Kalman Filter with indoor GPS some links: old Convict beacon projects; Höhrmann's project (German); Höhrmann's slides (German); Positioning with Independent Ultrasonic Beacons. TSOP62., TSOP64. www.vishay.com Vishay Semiconductors Rev. 1.7, 26-Sep-2018 1 Document Number: 82463 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT.