temporary led lampilluminator circuit

Here is a design for a temporary lamp circuit that is very helpful in emergency situations or in any application where there is limited time to turn off the lamp. Simply press the push button to perform a quick task, and then release it. This circuit keeps the LED light on for approximately 10 seconds, which is generally sufficient for most simple tasks. The circuit operates as follows: when the push button S1 is pressed, capacitor C1 charges instantly. In addition to charging the capacitor, the current also provides bias current to the base of the transistor. This base current activates the transistor, turning on the LED. Once the push button is released, capacitor C1 continues to supply base current for about 10 seconds, keeping the LED lamp illuminated. If this duration is considered too short, alternative values for C1, such as 47µF or 100µF, can be experimented with to observe the differences. Almost any small transistor can be utilized, as most can drive an LED lamp that draws less than 20 mA.

The temporary lamp circuit is a straightforward yet effective design that addresses the need for brief illumination in various situations. The core components of the circuit include a push button switch (S1), a capacitor (C1), and a small NPN transistor. The operation begins when the push button is pressed, allowing current to flow and charge the capacitor C1. The capacitor serves a dual purpose: it not only stores energy but also provides the necessary bias current to the base of the transistor.

The choice of the capacitor value directly influences the duration for which the LED remains lit. A standard value of 10µF provides approximately 10 seconds of illumination, but increasing the capacitance to 47µF or 100µF will extend this duration, allowing for longer tasks to be performed without the need to re-press the button. This adaptability makes the circuit versatile for various applications.

The transistor's role in the circuit is crucial, as it acts as a switch that controls the LED. When the base current from the capacitor is sufficient, the transistor enters saturation, allowing current to flow through the LED, illuminating it. The circuit is designed to handle LED currents up to 20 mA, making it suitable for a wide range of standard LEDs.

In summary, this temporary lamp circuit is a practical solution for situations requiring short-term lighting. Its simplicity, combined with the ability to adjust the illumination duration through capacitor selection, makes it an excellent choice for emergency lighting or quick tasks where hands-free operation is beneficial.Here`s a design circuit for temporary lamp circuit is very helpful in emergency situation or in any application where we don`t have much time to turn off the lamp. Just press the push button, do a little fast task, and then leave it. This circuit hold the LED light for about 10 seconds, which should be enough for most simple tasks. This is the fig ure of the circuit; This circuit works like this: when the push button S1 is pressed, the C1 will be fully charged instantly. Not only charging the capacitor, the current will supply the bias current for transistor`s base as well.

This base current will activate the transistor to turn on the LED. After the push button is depressed, the capacitor C1 will keep supplying the base current for about 10 seconds, holding the LED lamp on. If you think this period is too short then you can try with different C1 values, try 47uF or 100uF and you`ll see the difference.

You can use almost any type of small transistor since almost all small transistors will be capable of driving LED lamp which draw current less than 20 mA. 🔗 External reference