What is LED flasher circuit?

LED flashers are semiconductor integrated circuits used to turn on and off groups of light emitting diodes either sequentially or according to a programmed pattern. They are found in circuits used as indicators and controllers, as well as in home-built projects.

What are flasher circuits used for?

Applications have included such diverse circuits as a micropower low battery indicator, a lightning detector, a off-line switching power supply, a micropower high voltage supply, an unusual beeping capacitance probe, a windshield wiper controller, a lamp dimmer, a police siren, and several others.

How do LED flashers work?

Blinking Two LEDs Using Transistors The two capacitors C1 and C2 will alternate between being charged and discharged and thereby turning the transistors ON and OFF. When a transistor is ON it allows current to flow through it so that the LED above it will light up.

What is a transistor made up of?

Most transistors are made from very pure silicon, and some from germanium, but certain other semiconductor materials are sometimes used. A transistor may have only one kind of charge carrier, in a field-effect transistor, or may have two kinds of charge carriers in bipolar junction transistor devices.

Which transistor is used in LED flasher circuit?

This led flasher circuit is very easy and simple and there is no ic used. Use 9v or 12v battery or adaptor for this circuit. Both NPN transistor you can use of BC547, 548 or 2N2222.

How to convert a transistor two-LED flasher to single-led?

Figure 14 shows the practical circuit of a transistor two-LED flasher, which can be converted to single-LED operation by simply replacing the unwanted LED with a short circuit. FIGURE 14. Transistor two-LED flasher circuit operates at about 1Hz.

The two transistors are cross-coupled in such a way that the circuit switches back and forth between two states using transistors. This circuit is one of the most stable of LED flashers. The values in this circuit, two LEDs will alternately flash ON and OFF about once per second.

How to make a simple LED flasher blinker circuit?

This simple led flasher blinker circuit made by using two npn BC547 transistor and some resistors and capacitors. The speed of blinking can be changed by changing the value of capacitor C1 and C2. This led flasher circuit is very easy and simple and there is no ic used.