555 jewelry small electronic circuit diagram

  
Circuit as shown by 555 and the light emitting tube. 555 and R1, R2, C1 composition astable multivibrator, the oscillation frequency f 1.44/(R1 + 2R2) C1, the vibration frequen
555 jewelry small electronic circuit diagram - schematic

cy of about 2Hz, flashes twice per second. If LED1 ~ LED4 choose different colors of light-emitting diodes, add luster. R3, R4 current limiting resistor.




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