2 Transistor Led Flasher 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.

2 transistor led flasher circuit.

The circuit will operate using almost any small npn transistors e g. The following is led flasher circuit which use 2 transistors for led switching. While today most people use a ne555 timer ic this version is simple to build. More by the author.

R1 10m ohm r2 1k 100k ohm r3 470 ohm c1 0 47uf 10uf 25v d1 1n914 q1 2n3904 q2 2n3906 led high brightness red read more. This led flasher circuit is very easy and simple and there is no ic used. Two transistor led flasher circuit. Led flasher circuit diagram.

The leds altering on off cycle whose flash rate is control by the two 22uf capacitors and the two 10k resistors. By metsfan1938 in circuits electronics. Here is a blast from past as they say with a transistor astable multivibrator. The circuit works similar to flip flop operation.

Two transistor led flasher circuit. More about metsfan1938 how to make a circuit to make two leds flash back and forth. The circuit works similar to flip flop operation. This circuit is actually a astable multi vibrator it acts like a two switch which gives the complement outputs the basics is that when one transistor is in saturation region the other transistor will be in the cutoff region so the led in cutoff region will glow and the led in saturation region will not glow on the next cycle the cutoff transistor will goes to saturation region and the other.

Ksp2222 pn2222 2n2222 bc107 bc108 bc109 etc. The circuit can operate from a voltage of about 5v up to 12v change the value r4 to about 1k if using a voltage higher than around 10v. The following is led flasher circuit which use 2 transistors for led switching. The resistor r and capacitor c determines the timing of the flasher and the period is proportional to r c.

Simple 2 transistor led flasher circuit. The speed of blinking can be changed by changing the value of capacitor c1 and c2. R1 10m ohm r2 1k 100k ohm r3 470 ohm c1 0 47uf 10uf 25v d1 1n914 q1 2n3904 q2 2n3906 led high brightness red led this circuit.