How to make simple led flasher using transistor follow us on.
Npn transistor flasher circuit.
But the supply voltage not be less than 9v otherwise the circuit might fail to work correctly.
There are many circuits here is one of the blinking circuits.
Often we know it 2 led flasher circuit in this we use pnp transistor.
Circuit diagram blinking led circuit.
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.
Blinking 2 led circuit using npn transistors.
This circuit can be operated using dc 6 12v supply.
After making a circuit connect 9v battery to the circuits.
This circuit contains both npn and pnp transistors.
Led flashing start by a specific interval.
But now we use 2 npn transistor.
The combination of resistors and capacitors determines the timing of the flasher and the time duration is proportional to r x c.
This led flasher circuit is very easy and simple and there is no ic used.
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.
Parts list for the proposed single transistor led flasher circuit.
Police style strobe light circuit is operating using 555 ics and these ics can operate a limited amp and current.
We normally see it in a lot of circuit as.
Components for the circuit.
This circuit basically works on the charging and discharging of capacitors.
We call it astable multivibrator.
The flashing rate could be varied either by changing the value of r1 or c1 or both together.
2 piece of timer ic555.
This interval can be varied by varying the value of the capacitor.
The resistor r and capacitor c determines the timing of the flasher and the period is proportional to r c.
2 piece of 1m 1000k resistor.
Active 3 years 11 months ago.
Understand 2 transistors npn pnp flasher circuit working.
I like blinking 2 led circuit using npn transistors.
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.
Led any type any color.
Both npn transistor you can use of bc547 548 or 2n2222.
So to add more than 8 leds you should use transistor to control the power other wise your ics may damaged.
Ask question asked 3 years 11 months ago.
