555 practical DC stepless light modulator circuit

Published:2011/5/22 19:16:00 Author:TaoXi | Keyword: practical, DC, stepless, light modulator | From:SeekIC

As the figure 17-41 shows, the light modulator uses 555 as the core. The astable multivibrator is composed of the 555 and R1，RP，R2，C1, the oscillation frequency f=1.44/(R1+RP+R2)C1, it is about 650Hz. The duty cycle range is from 4.5% to 95.5%, you can change the duty cycle by adjusting RP, so the brightness of light changes in a wide range, we realize the free dimming.



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