Npn Transistor Flasher Circuit

The resistor r and capacitor c determines the timing of the flasher and the period is proportional to r c.

Npn transistor flasher circuit.

Viewed 3k times 0 begingroup i implemented this circuit on a breadboard and it works. But now we use 2 npn transistor. This led flasher circuit is very easy and simple and there is no ic used. Both npn transistor you can use of bc547 548 or 2n2222.

I like blinking 2 led circuit using npn transistors. So to add more than 8 leds you should use transistor to control the power other wise your ics may damaged. How to make simple led flasher using transistor follow us on. Led any type any color.

This circuit basically works on the charging and discharging of capacitors. Led flashing start by a specific interval. 2 piece of timer ic555. Increasing the value of the capacitor will result in increasing the interval time of the led.

The flashing rate could be varied either by changing the value of r1 or c1 or both together. But the supply voltage not be less than 9v otherwise the circuit might fail to work correctly. We normally see it in a lot of circuit as. Ask question asked 3 years 11 months ago.

This circuit can be operated using dc 6 12v supply. 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. There are many circuits here is one of the blinking circuits. 2 piece of 1m 1000k resistor.

Parts list for the proposed single transistor led flasher circuit. Blinking 2 led circuit using npn transistors. However on proteus isis it doesn t i have to change the 330k to 1500k for it to work on proteus. After making a circuit connect 9v battery to the circuits.

Understand 2 transistors npn pnp flasher circuit working. Circuit diagram blinking led circuit. Use 9v or 12v battery or adaptor for this circuit. This circuit contains both npn and pnp transistors.

R1 2k7 r2 100 ohms t1 bc 547 c1 100 uf to 470 uf. The above circuit uses a combination of bc 557 and bc 547 transistors in such a way that bc 547 npn transistor conducts for a very brief time making the led light. Components for the circuit. This interval can be varied by varying the value of the capacitor.

We call it astable multivibrator. Active 3 years 11 months ago.