Transistor Flasher Schematic

In the first circuit a flasher circuit in series with a 220 ohm resistor turns on a power transistor.

Transistor flasher schematic. Cree white led matrix copied from the digikey search engine and edited numerous devices are available. Circuit diagram blinking led circuit. This circuit basically works on the charging and discharging of capacitors. 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 circuit can be operated using dc 6 12v supply. Cree white led matrix xls. Led any type any color. Parts list for the proposed single transistor led flasher circuit.

Key to the brightness is the led. Lamp flasher circuit using 2n2907 bipolar transistor i has evered to play the leading role lamp flasher circuit with the integrated circuit. But the supply voltage not be less than 9v otherwise the circuit might fail to work correctly. Use 9v or 12v battery or adaptor for this circuit.

In the second circuit a power fet is used in place of the npn. R1 2k7 r2 100 ohms t1 bc 547 c1 100 uf to 470 uf. Both npn transistor you can use of bc547 548 or 2n2222. The flashing rate could be varied either by changing the value of r1 or c1 or both together.

Power transistors may be added for handling higher current loads. I selected a cree device cree is well known for ultrabright white leds. Can be used on roads for signaling purposes. This led flasher circuit is very easy and simple and there is no ic used.