LM3909 Datasheet, PDF (6/8 Pages) National Semiconductor (TI) – LM3909 LED Flasher/Oscillator

Typical Applications (Continued) (See applications notes above)
1 kHz Square Wave
‘‘Buzz Box’’ Continuity and Coil Checker
TL H 7969 – 14
TL H 7969 – 15
Note Output voltage through a 10k load to ground
Variable Flasher
TL H 7969 – 16
Note Differences between shorts coils and a few ohms of resistance can be
heard
Note Flash rate 0 Hz–20 Hz
TL H 7969 – 17
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