Introduction
We always try to come up with different circuits, sometimes we try to build complicated circuits to make them simpler for you. If you are a complete beginner, this is one of the easiest circuits for you. There are also some major projects that are totally based on LEDs. For example, the flasher circuits. You may also observe these kinds of circuits in police mobiles and ambulances to make people alert. So, in this tutorial, we are going to “Variable LED flasher”
Hardware Required
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | IC | LM3909 | 1 |
| 2. | Variable Resistor | 2.5K Ω | 1 |
| 3. | LED green | – | 1 |
| 4. | Battery | – | 1 |
| 5. | Capacitor | 350uF/10V | 1 |
| 6. | Resistor | 100 Ω, 2.2K Ω | 2,1 |
| 7. | 2-Pin Connector | – | 1 |
Circuit Diagram
Working Explanation
This Variable LED flasher is using an IC LM3909 which is a monolithic oscillator and is uniquely designed to flash Light-Emitting diodes. Here we are using a 100uf timing capacitor for voltage boost. At the supply of 1.5V or less, this timing capacitor will deliver pulses of two or more volts to the LED. The circuit is naturally self-starting. Hence only need a battery and capacitor to work as a flasher circuit. The potentiometer R2 is there in the circuit to vary the speed of the flasher.
Application and Uses
- In the circuits of vehicle indicators.
- In the making of LED blinking circuits.
- As a signal flashlight.
- Also, used for decoration purposes
- In toys of children.
- In signal lights.
- In some display circuits, etc.
