PROGRAMMABLE_LIGHT_ACTIVATED_RELAY

Published:2009/6/22 22:47:00 Author:Jessie | From:SeekIC

Digital inputs A, B, C, D select different light levels by varying the value of bridge circuit resis-tance R4.IC1 741 op ampIC2 CD4066 quad bilateral switchQ1 NPN transistor (2N2222, 2N3904, or similar) D1 diode (1N4002, or similar)C1 0.1-μF capacitorR1 photoresistorR2, R3 390-kΩ, 1/4-W 5% resistorR4, R5 1-MΩ, 1/4-W 5% resistorR6 820-kΩ, 1/4-W 5% resistorR7 470-kΩ, 1/4-W 5% resistorR8 270-kΩ, 1/4-W 5% resistorR9 100-kΩ, 1/4-W 5% resistorK1 relay to suit load



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