555 small electronic jewelry circuit

Published:2011/5/22 19:31:00 Author:TaoXi | Keyword: small electronic jewelry | From:SeekIC

As the figure 17-50 shows, the small electronic jewelry is composed of the 555 and the luminotron. The astable multivibrator is composed of the 555 and R1，R2，C1, the oscillation frequency f=1.44/(R1+2R2)C1, it is about 2Hz (it flashes twice per second). If the LED1～LED4 use different colors of LEDs, the effect is more better. R3，R4 are the current limiting resistor.



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