Delay Lamp On/Off Circuit Using Zener Diode

The circuit consist of least numbers of electronic components, The transistor is act as a switch here. The transistor is open and close to control the Light. The exact functions of the circuit is explained here,

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Delay on/off Circuit using Zener diode

Delay on off circuit using zener diode
  • Switch Closed:
    • Transistor is OFF.
    • Capacitor starts charging.
    • Q1 turns ON when the capacitor voltage reaches the zener breakdown voltage.
    • Powers the load.
  • Switch Opened:
    • Capacitor discharges through R2.
    • Q1 turns OFF when the voltage drops below the zener breakdown.
    • Load is turned off.

This circuit essentially provides a controlled time delay in turning on and off a load based on the charging and discharging of the capacitor in conjunction with the zener diode and transistor.

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