Transistor Flasher Schematic

The flashing rate could be varied either by changing the value of r1 or c1 or both together.

Transistor flasher schematic.

We can create a dancing led circuit by combining many similar circuits which we can use for advertisement boards. In the first circuit a flasher circuit in series with a 220 ohm resistor turns on a power transistor. Can be used on roads for signaling purposes. Cree white led matrix xls.

I selected a cree device cree is well known for ultrabright white leds. Use 9v or 12v battery or adaptor for this circuit. 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. Cree white led matrix copied from the digikey search engine and edited numerous devices are available.

Power transistors may be added for handling higher current loads. 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. R1 2k7 r2 100 ohms t1 bc 547 c1 100 uf to 470 uf. Key to the brightness is the led.

Both npn transistor you can use of bc547 548 or 2n2222. This circuit basically works on the charging and discharging of capacitors. In the second circuit a power fet is used in place of the npn. Led any type any color.

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. This circuit can be operated using dc 6 12v supply. Lamp flasher circuit using 2n2907 bipolar transistor i has evered to play the leading role lamp flasher circuit with the integrated circuit.