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Midnight Security Light Circuit Schematic

Konusu 'Elektronik Devreler' forumundadır ve uydudoktoru tarafından 22 Nisan 2015 başlatılmıştır.

  1. uydudoktoru
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    uydudoktoru Aktif Üye Yönetici Yönetici

    Katılım:
    13 Haziran 2009
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    Most thefts happen after midnight hours when people enter the second phase of sleep called ‘paradoxical’ sleep. Here is an energy-saving circuit that causes the thieves to abort the theft attempt by lighting up the possible sites of intrusion (such as kitchen or backyard of your house) at around 1:00 am. It automatically resets in the morning. The circuit is fully automatic and uses a CMOS IC CD 4060 to get the desired time delay. Light-dependent resistor LDR1 controls reset pin 12 of IC1 for its automatic action. During day time, the low resistance of LDR1 makes pin 12 of IC1 ‘high,’ so it doesn’t oscillate.

    After sunset, the high resistance of LDR1 makes pin 12 of IC1 ‘low’ and it starts oscillating, which is indicated by the fashing of LED2 connected to pin 7 of IC1. The values of oscillator components (resistors R1 and R2 and capacitor C4) are chosen such that output pin 3 of IC1 goes ‘high’ after seven hours, i.e., around 1 am. This high output drives triac 1 (BT136) through D5 and R3. Bulb L1 connected between the phase line and M2 terminal of triac 1 turns on when the gate of triac 1 gets the trigger voltage from pin 3 of IC1. It remains ‘on’ until pin 12 of IC1 becomes high again in the morning. Capacitors C1 and C3 act as power reserves, so IC1 keeps oscillating even if there is power interruption for a few seconds. Capacitor C2 keeps trigger pin 12 of IC1 high during day time, so slight changes in light intensity don’t affect the circuit.

    Using preset P1 you can adjust the sensitivity of LDR1. Power supply to the circuit is derived from a step-down transformer T1 (230V AC primary to 0-9V, 300mA secondary), rectifed by a full-wave rectifer comprising diodes D1 through D4 and fltered by capacitor C1. Assemble the circuit on a general-purpose PCB with adequate spacing between the components. Sleeve the exposed leads of the components. Using switch S1 you can turn on the lamp manually. Enclose the unit in a plastic case and mount at a location that allows adequate daylight.


    Circuit diagram:
    [​IMG]

    Parts:

    P1 = 100K
    R1 = 120K
    R2 = 1M
    R3 = 100R
    R4 = 100R

    C1 = 1000uF-25V
    C2 = 100uF-25v
    C3 = 100nF-63V
    C4 = 1uF-25V

    D1 = 1N4001
    D2 = 1N4001
    D3 = 1N4001
    D4 = 1N4001
    D5 = Red LED
    D6 = Green LED
    IC = CD4060
    TR = BT136
    T1 = 9v 300mA Transformer
    L1 = 230V-60W Bulb
    SW = On/Off Switch
     
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