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Vision protection circuit using 555 timer

Published on May 05 2011 // Timing control circuits

Vision protection circuit using 555 timer.

Shown to protect the visual timing circuits. This circuit uses the 555 and R2, R3, R4 and C3 form a variable duty cycle pulse generator to control the bidirectional thyristor VS, so light and table lamp ZD temporarily out regularly to ensure that the eyes regular breaks when reading, to protect eyesight. Writing desk lamp light per 50 minutes, off for 10 minutes, repeat the light off.