Frequency Calibrator for AM and Shortwave Radios

Published:2013/3/10 22:42:00 Author:Ecco | Keyword: Frequency Calibrator , AM , Shortwave Radios | From:SeekIC

The circuit was built on a hand-wired prototype board as shown in the photo, a more permanent circuit could be built with a OnePas prototype board or a hand-wired perf-board. IC sockets are recommended for more permanent wiring jobs. Selection of the available frequencies can be done with an optional 1P5T rotary switch or a board-mounted 5 position DIP switch. In the prototype shown, frequency selection is done by moving a jumper wire. The 5VDC supply is provided by an external DC power supply, four 1.25 NiMH cells could also be used. If you use NiMH cells, don't forget to add a fuse and a switch. It is a good idea to build the circuit into a small metal box, use insulated standoffs and machine screws to mount the board to the box.



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