Transistor Flasher Schematic

I selected a cree device cree is well known for ultrabright white leds.

Transistor flasher schematic.

Parts list for the proposed single transistor led flasher circuit. R1 2k7 r2 100 ohms t1 bc 547 c1 100 uf to 470 uf. But the supply voltage not be less than 9v otherwise the circuit might fail to work correctly. Key to the brightness is the led.

The flashing rate could be varied either by changing the value of r1 or c1 or both together. The two circuits below are typical connections. Circuit diagram blinking led circuit. Power transistors may be added for handling higher current loads.

Use 9v or 12v battery or adaptor for this circuit. Led any type any color. Cree white led matrix copied from the digikey search engine and edited numerous devices are available. Which be the circuit that is simple but at this time a friend someone complain to come to that want the circuit that use the transistor.

This circuit can be operated using dc 6 12v supply. This circuit basically works on the charging and discharging of capacitors. Both npn transistor you can use of bc547 548 or 2n2222. Cree white led matrix xls.

We can create a dancing led circuit by combining many similar circuits which we can use for advertisement boards. In the second circuit a power fet is used in place of the npn. 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 led flasher circuit is very easy and simple and there is no ic used.