Transistor Flasher Schematic

In the second circuit a power fet is used in place of the npn.

Transistor flasher schematic.

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

Cree white led matrix xls. The two circuits below are typical connections. Use 9v or 12v battery or adaptor for this circuit. In the first circuit a flasher circuit in series with a 220 ohm resistor turns on a power transistor.

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 led flasher circuit is very easy and simple and there is no ic used. Power transistors may be added for handling higher current loads. The flashing rate could be varied either by changing the value of r1 or c1 or both together.

Lamp flasher circuit using 2n2907 bipolar transistor i has evered to play the leading role lamp flasher circuit with the integrated circuit. I selected a cree device cree is well known for ultrabright white leds. Led any type any color. Both npn transistor you can use of bc547 548 or 2n2222.

This circuit basically works on the charging and discharging of capacitors. This circuit can be operated using dc 6 12v supply. 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. Can be used on roads for signaling purposes.