Battery operated mini night lamp

Description.

This is the circuit of a low power LED night lamp that will automatically switch OFF at day time. The CMOS timer IC TS555CN is wired as a square wave generator operating at around 5Hz.The output voltage from the IC1 is doubled using the combination of capacitor C2 and diode D2 in order to drive the LED. The LED can be a bright white LED. At day time the resistance of LDR drops to few K Ohms and inhibits the IC from producing oscillations.

Circuit diagram with Parts list.

battery operated mini night lamp circuit

Notes.

  • Assemble the circuit on a general purpose PCB.
  • The circuit can be powered from two 1.5V cells in series.
  • Any diode can be used in place of D2, but Schottky diode like 1N5819 will give more brightness.
  • The IC1 must be CMOS type because other types won’t operate at low voltages like 3V.
  • An optional switch can be added in series with the battery ( not shown in circuit) to provide an manual ON/OFF.
Show Comments

12 thoughts on “Battery operated mini night lamp

  1. Ted W

    I have seen this circuit numerous times and nobody can tell me that it works. Some say that it will work with one 1.5 volt battery because the 555 doubles the voltage, but the fact remains that the LED and diode still make the circuit stay lit without anything else being necessary.

    The 220 uf capacitor guarantees that the 555 can NEVER turn the light off! at best, it can make it blink.

    Reply
  2. HMF

    I cant understand how the LED ever turns off. Won’t current flow from the battery through the LED through D2 even if the TS555CN is inhibted?

    Reply
  3. crazy009

    “Battery operated mini night lamp” is not working, time waste money waste dude worst circuit pls just remove this circuit

    Reply
    • admin

      I think you have used a NE555 IC instead of the TS555CN. TS555CN is the CMOS version of NE555. Only CMOS ICs can work well on low voltages like 2V. I dont think there is any problem with the circuit.

      Reply

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