Bedside Lamp Timer


Posted on Feb 4, 2014

The purpose of this circuit is that of power a lamp or other apparatus for a given time (30 minutes in this case), and then to turn it off. It`s useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep. After turn-on by P1 pushbutton, an LED lights for c25 minutes, but 6 minutes before the tur


Bedside Lamp Timer
Click here to download the full size of the above Circuit.

n-off, start blinking for two minutes, then stop blinking for other two minutes and finally blinks for other two minutes, thus signaling that the on-time is ending. If the user want to prolong the reading, can earn another half-hour of light by pushing on P1. Turning-off the lamp at user`s ease is obtained pushing on P2. Q1 and Q2 forms an ALL-ON ALL-OFF circuit that in the off state draw no significant current. P1 starts the circuit, the relay is turned on and the two ICs are powered. The lamp is powered by the relay switch, and IC2 is reset with a positive voltage at pin 12. IC2 start oscillating at a frequency settled by R4 and C4. With the values shown pin 3 goes high after c30 minutes, turning off the circuit via C3. During the c6 minutes preceding turn-off, the LED does a blinking action by connections of IC1 to pins 1, 2 & 15 of IC2. Blinking frequency is provided by IC2 oscillator at pin 9. The two gates of IC1 are in parallel to source an higher current. If needed, a piezo sounder can be connected at pins 1 & 14 of IC1. Changing IC2 brand name, varies the oscillation frequency. In particular Motorola`s ICs run faster. Obviously, time can be varied changing C4 and R4 values.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    12 Volt 30 Amp PSU
    12 volt power supply (7812)
    Mike preamp with tone control
    In-line wattmeter
    Wireless Headphone Transmitter Receiver Circuit
    Homemade HiFi
    simple accu charger circuit
    LowCost Spectrum Analyzer
    Audio Oscillators
    BQ24400 Switch-mode NiCd/NiMH Battery Charger With Peak Voltage Detection Termination
    OverUnity Lead Acid Battery Switching Self Battery Charging
    Mains Voltage Monitor



    Top