SINGLE_LED_TUNING_INDICATOR

Published:2009/7/2 22:58:00 Author:May | From:SeekIC

Circuit shown, when driven by IF output of FM tuner, permits tuning for maximum brightness of single LED such as 50824403. Article gives choice of two tuning indicator circuit awangements that can be used with the SBA750 limiting IF amplifier and detector IC. Recommended version of tuning indicator uses Plessey SL3046 five-transistor array with discrete resistors and capacitor to drive LED. Arrangement gives very clear, sensitive indication of correct tuning point to within a few millivolts.-J. A. Skingley, Sensitive F.M. Tuning Indicator, Wireless World, June 1974, p 173-174.



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