Automatic light control circuit curtains

The circuit works as follows: every morning, light shines into the silicon photocell, generating a force, this force will transistor VT1 conduction,

the capacitor cl charged with the capacitor C. Voltage rising, VT2 emitter current is gradually increasing, this current reaches the thyristor gate trigger current, the thyristor is triggered conduction, the relay pull-K, contact conversion, DC motor driven positive spin turn, the deceleration drive curtains moving slowly to a stop.

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