Npn Transistor Flasher Circuit

Police style strobe light circuit is operating using 555 ics and these ics can operate a limited amp and current.

Npn transistor flasher circuit.

We normally see it in a lot of circuit as. The resistor r and capacitor c determines the timing of the flasher and the period is proportional to r c. Both npn transistor you can use of bc547 548 or 2n2222. However on proteus isis it doesn t i have to change the 330k to 1500k for it to work on proteus.

Understand 2 transistors npn pnp flasher circuit working. This circuit basically works on the charging and discharging of capacitors. The combination of resistors and capacitors determines the timing of the flasher and the time duration is proportional to r x c. But the supply voltage not be less than 9v otherwise the circuit might fail to work correctly.

Active 3 years 11 months ago. But now we use 2 npn transistor. Components for the circuit. This circuit contains both npn and pnp transistors.

2 piece of timer ic555. Blinking 2 led circuit using npn transistors. 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.

Use 9v or 12v battery or adaptor for this circuit. 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. The flashing rate could be varied either by changing the value of r1 or c1 or both together. R1 2k7 r2 100 ohms t1 bc 547 c1 100 uf to 470 uf.

We call it astable multivibrator. Parts list for the proposed single transistor led flasher circuit. I like blinking 2 led circuit using npn transistors. 2 piece of 1m 1000k resistor.

Circuit diagram blinking led circuit. Viewed 3k times 0 begingroup i implemented this circuit on a breadboard and it works. How to make simple led flasher using transistor follow us on. This led flasher circuit is very easy and simple and there is no ic used.

After making a circuit connect 9v battery to the circuits. Led flashing start by a specific interval. Ask question asked 3 years 11 months ago. This interval can be varied by varying the value of the capacitor.

This circuit can be operated using dc 6 12v supply. Led any type any color.