Multipurpose Mini Flasher is designed by using timer IC LM555 and two LEDs, these two LEDs are glows alternatively according to the timer IC output. By variable Resistor used in this circuit we can adjust the blinking speed of LEDs.
This Mini Flasher circuit works like astable multivibrator and gives continuous square pulse output. This circuit can operate by using 6 volt to 10 volt power source, here we used battery in schematic (you can use any power source which provides less than 400 mA).
1. IC1 LM555 Package_SO:SOIC-8_3.9x4.9mm_P1.27mm 2. C2 0.1µF Capacitor_SMD:C_0805_2012Metric 3. R3 220Ω Resistor_SMD:R_0805_2012Metric 4. D1 LED-red LED_SMD:LED_0805_2012Metric 5. D2 LED-blue LED_SMD:LED_0805_2012Metric 6. R2 3.3KΩ Resistor_SMD:R_0805_2012Metric 7. RV1 100KΩ Potentiometer_SMD:Potentiometer_ACP_CA6-VSMD_Vertical 8. R1 1KΩ Resistor_SMD:R_0805_2012Metric 9. C1 10µF/16V Capacitor_SMD:CP_Elec_5x5.4 10. BT1 Battery_6V Connector_Wire:SolderWirePad_1x02_P3.81mm_Drill0.8mm
Construction & Working
For an experiment here we constructed this circuit on a PCB and all components involved in this prototype are SMD elements. After Printed Circuit Board Assembly, apply power supply to the board and then timer IC LM555 starts to oscillate Square pulse, duty cycle of the pulse is depends on the value of RV1 and C1. By varying RV1 we can get different range of duty cycle.
At the output terminal two LEDs are connected through R3 Resistor and these two connected in antiparallel way. Hence for both positive and negative cycle output LEDs will glow alternatively.
Timer IC 555 Astable Multivibrator Calculation
Here, RA = R2 Resistor, RB = RV1+R1 Resistors, C = C1 Capacitor value.
Interactive Board Viewer