LCD-LED Display

LED–LDR Blinker Schematic Circuit Diagram

It normally takes two transistors to build a blinker circuit (in order to make positive feedback possible). However, you can also use a photoresistor (LDR) that is illuminated by an LED. The feedback takes place here by means of light rays.

LED–LDR Blinker Schematic Circuit Diagram

The circuit is easy to understand. When light falls on the LDR, the current increases. The capacitor then charges, and this increases the base current. This causes the transistor to switch the LED fully on. The stable ‘on’ state switches to the ‘off’ state as soon as the capacitor is fully charged. The LED is then completely off, the base voltage goes negative and the transistor is cut off. The circuit cannot switch back to the ‘on’ state until the capacitor has been discharged via the base resistor.

The circuit naturally reacts to external light sources as well. You will have to test it in different light environments to see whether it will work. In any case, it will not work in full sunlight. With an ultrabright LED and a very low resistance LDR, it might be possible to build a blinker without using a transistor. The combination of the LED and the LDR would have to provide the gain that is needed to produce oscillations.

The blinker circuit design is made using the LM395 IC. This IC is a short-circuit-proof power transistor with special characteristics. This is sometimes called a “super transistor”. LM395 is used in this circuit as an alarm blinker for cars.
A transistor is a miniature semiconductor that regulates or controls current or voltage flow in addition to amplifying and generating these electrical signals and acting as a switch/gate for them. Typically, transistors consist of three layers, or terminals, of semiconductor material, each of which can carry a current.
Microphones are a classic example of daily-use devices that make use of transistors for their basic operation. Various microphones such as a condenser microphones typically make use of an electronic circuit that tends to perform impedance modification by converting mechanical waves into an electrical signal.

Related Articles

Leave a Reply

Your email address will not be published.

Back to top button