555 amblyopia treatment rear shape therapy control circuit

Published:2011/5/23 6:30:00 Author:TaoXi | Keyword: amblyopia, treatment, rear shape therapy, control circuit | From:SeekIC

As the figure 16-27 shows, the astable multivibrator is composed of the 555 and R1，R2，RP1，RP2，RP3, the oscillation periods are: T=tcharging+tdischargingtcharging=0.693(R1+RP1+R2+RP2)C1tdischarging=0.693(R2+RP1+RP2)C1 You can change the frequency and the duty ratio by adjusting the RP1,RP2,RP3, at the initial treatment, the frequency of 50 times per minute is better, then, you can improve the frequency to 70-80 times per minute. When the switch K2 cuts off, the light time is about 1 minute; when K1 cuts off, K2 opens, the treatment light will cyclical changes.



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