Transistor Blinking Circuit

Parts list for the proposed single transistor led flasher circuit.

Transistor blinking circuit.

Today we will learn how to make an led flashing or led blinking circuit using only transistors. The circuit actually exploits the negative resistance factor in transistors to produce the blinking effect. Most of the other videos online are from a very long time ago and are mostly out of focus. When we power up the circuit the led blinks continuously.

These types of circuits are useful when we need a decoration in our homes or in our hobbies like we used to make a little home from scrapes and. I ll be soon writing a comprehensive article on this and we ll see there how the concept can be modified in many different ways. The resistor r and capacitor c determines the timing of the flasher and the period is proportional to r c. Resistors 22 1k 1m ohms.

This circuit uses a bc557 pnp transistor connected to a bc547 npn transistor in such a way so that the bc547 conducts for a very brief time making the led light. This circuit is working based on the two transistors. So follow every step and learn about how to make your own led blinking circuit. The lamp flashing circuit is basic flasher 6v that low current and small size.

2 led flasher circuit simple blinking flasher led circuit. The free pcb you will get from the bottom of this site. Which we use the transistors are 2 pcs is npn 2n3904 and pnp 2n3906 types by they have regenerative feedback send pulse of current 60ms. To understand this circuit you need to know how voltages and currents behave around resistors capacitors and diodes which is something you can learn in ohmify.

We will be using two transistors to make this circuit instead of 555 timer ic because the transistors are cheaper and are easily available in the market. Blinking two leds using transistors. This two transistor led flasher circuit is easy to build. The circuit is built using transistors resistors capacitors and leds.

Simple blinking led circuit. This post is a complement to dick cappel s simplest led flasher circuit post. R1 2k7 r2 100 ohms t1 bc 547. This simple led flasher blinker circuit made by using two npn bc547 transistor and some resistors and capacitors.

The parts list includes. The circuit for blinking an led using transistors is called an astable multivibrator. Here s how you blink an led with just an led capacitor transistor and two resistors. Circuit diagram of led flasher blinker.

Of course you will need a breadboard wire jumpers and a power source. I ve added a fritzing diagram and some high res photos and video so that you can quickly build the circuit. The speed of blinking can be changed by changing the value of capacitor c1 and c2.