Electronics

Dark Sensor

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Dark Sensor

Dark sensor using 2 transistor BC547 When light falls on LDR, its low resistance drives the transistor T1 into conduction. This keeps transistor T2 cut-off due to low base bias. The LED does not get power as long  as ambient light falls on it. Parts list T1 and T2 – BC 547 LDR  -1 nos Resistance […]