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BlackMamba
Guest
Source: Automat o
Project by Mariuszek15
Often we work at the desk. Being busy we didn’t notice dawn and our eyes get tired by the weaker light. So controller for keeping constant light intensity will be useful. Dawn would cause gradual increase of light intensity.
Description
If photo resistor F1 is lit then T2 transistor base is shorted to its emitter and circuit is in rest. If photo resistor will be in the dark area then transistor T2 start conducting and T1 (BD244) transistor will open slowly and will power halogen lamp. R1 resistor is to set sensitivity (when halogen lamp should be fully powered). Diode D3 indicates circuit functioning and diode D1 indicates Ż1 lamp working. C1 capacitor filters supply voltage. T1 transistor (BD244) should be equipped with small radiator.
Supply voltage is 12V DC. Instead of halogen lamp a ultra bright LEDs may be used. In that case a serial 1k resistor is necessary.
