Npn Transistor Flasher Circuit

The combination of resistors and capacitors determines the timing of the flasher and the time duration is proportional to r x c.

Npn transistor flasher circuit.

2 piece of timer ic555. 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. So to add more than 8 leds you should use transistor to control the power other wise your ics may damaged. This circuit contains both npn and pnp transistors.

But now we use 2 npn transistor. Understand 2 transistors npn pnp flasher circuit working. Led flashing start by a specific interval. Often we know it 2 led flasher circuit in this we use pnp transistor.

We call it astable multivibrator. After making a circuit connect 9v battery to the circuits. R1 2k7 r2 100 ohms t1 bc 547 c1 100 uf to 470 uf. Use 9v or 12v battery or adaptor for this circuit.

However on proteus isis it doesn t i have to change the 330k to 1500k for it to work on proteus. This circuit basically works on the charging and discharging of capacitors. 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. Police style strobe light circuit is operating using 555 ics and these ics can operate a limited amp and current.

Ask question asked 3 years 11 months ago. But the supply voltage not be less than 9v otherwise the circuit might fail to work correctly. The resistor r and capacitor c determines the timing of the flasher and the period is proportional to r c. We normally see it in a lot of circuit as.

Parts list for the proposed single transistor led flasher circuit. Led any type any color. The flashing rate could be varied either by changing the value of r1 or c1 or both together. How to make simple led flasher using transistor follow us on.

Viewed 3k times 0 begingroup i implemented this circuit on a breadboard and it works. Increasing the value of the capacitor will result in increasing the interval time of the led. I like blinking 2 led circuit using npn transistors. Components for the circuit.

2 piece of 1m 1000k resistor. This led flasher circuit is very easy and simple and there is no ic used. Blinking 2 led circuit using npn transistors. Circuit diagram blinking led circuit.

Both npn transistor you can use of bc547 548 or 2n2222. This circuit can be operated using dc 6 12v supply.