Schmitt trigger light

Posted on Mar 28, 2007

As shown, the circuit 555 as the core, and the composition of the photosensitive resistor RG and RP1 like. RG strength with light exhibit different resistance, reset and set th

Schmitt trigger light
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e internal feature uses two comparators 555, and may form a Schmitt trigger. When the light intensity, RG showed low resistance, 2 feet was low ( 1/3 VDD trigger level), 555 set, K does not operate; when the light is weak, RG showed a high impedance, 6 feet high level 2/3 VDD to the threshold level, the reset 555, K pull.

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