Novel Metronome

  
The LM3909 is configured so that the frequency of oscillation is dependent on a single RC timing circuit, which consists of
Novel Metronome - schematic

CI and R2. LED1 discharges capacitor CI and the resultant pulse is directed into pin 3 as well as pin 1 of the LM386 audio amplifier to externally control that unit, thereby providing adequate volume. The circuit, as it is configured, provides frequency ranges from 57 to 204 beats per minute, and plenty of volume.




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