2 Transistor Flasher Circuit

We can create a dancing led circuit by combining many similar circuits which we can use for advertisement boards.

2 transistor flasher circuit.

In the second circuit a power fet is used in place of the npn. The circuit will operate using almost any small npn transistors e g. The transistors do not necessarily have to be bc547 you may use 2n2222 or similar small signal transistors but it is recommended to always use the equivalent transistors. This simple led flasher blinker circuit made by using two npn bc547 transistor and some resistors and capacitors.

The speed of blinking can be changed by changing the value of capacitor c1 and c2. Power transistors may be added for handling higher current loads. I like blinking 2 led circuit using npn transistors. Blinking 2 led circuit using npn transistors.

We call it astable multivibrator. The two circuits below are typical connections. By lewis loflin tweet. There are many circuits here is one of the blinking circuits.

While today most people use a ne555 timer ic this version is simple to build. Electrolytic capacitors 16v or more try using 47uf or 33uf capacitors to speed up the rate at which the leds flash. The capacitor c charges through the resistor r and since its value is. Npn transistors 2n2222 bc107 bc108 or bc109 transistors can be used in the circuit but have a different case to.

The resistor r and capacitor c determines the timing of the flasher and the period is proportional to r c. But now we use 2 npn transistor. Ksp2222 pn2222 2n2222 bc107 bc108 bc109 etc. Often we know it 2 led flasher circuit in this we use pnp transistor.

More about metsfan1938 how to make a circuit to make two leds flash back and forth. We normally see it in a lot of circuit as. 470 ohm resistors yellow violet brown r1 r4. Simple 2 transistor led flasher circuit.

This led flasher circuit is very easy and simple and there is no ic used. 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. In the first circuit a flasher circuit in series with a 220 ohm resistor turns on a power transistor. 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. More by the author. 2 led flasher circuit simple blinking flasher led circuit. Here is a blast from past as they say with a transistor astable multivibrator.

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.