SINGLE_IC_RADIO

Published:2009/7/15 23:02:00 Author:Jessie | From:SeekIC

National LM3909 IC is connected as detector-amplifier driving loud-speaker, with extremely low power gain giving continuous operation for 1 month from D cell. Tuning capability is comparable to that of simple crystal set. Provides acceptable volume from local station if used with efficient 6-inch 40-ohm loudspeaker. Coil is standard AM radio ferrite loopstick having tap 40% of turns from one end. Short antenna can be 10-20 feet, and long antenna can be 30-100 feet.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-154, p 8-9.



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