In this application the MR204 is used to control a Point Motor, a Signal, and 2 LED’s at the Control Panel. LM3909 LED Flasher/Oscillator February 1995 LM3909 LED Flasher/Oscillator General Description The LM3909 is a monolithic oscillator specifically designed to flash Light Emitting Diodes. An LED is an important component in electronics, it is used for several indi… FIGURE 14. So, if you added an additional LED to each circuit leg with an existing LED, then you could have 2 on and 2 off, flashing back and forth (instead of 1 on and 1 off flashing back and forth). The simple sequential LED flasher can be powered from a 9V power supply unit, or a battery may be used. In this tutorial, we will show you how to make an LED flasher or LED blinking circuit using 555 Timer IC.This IC creates pulses of current at a specific time interval, and we will use these pulses to create an LED flasher circuit, The time interval of the pulses can be controlled by changing the value of resistors and capacitors used in the circuit A two-LED flasher is a simple modification of this circuit, but is arranged so that one LED switches on when the other switches off, or vice versa. What changes do i … Simple Basic LED Circuit (How to Use LEDs): This instructable will guide how to use LEDs and how to make simple basic LED circuits, which current limiting resistor to use for operating LEDs with 3V, 6V, 9V & 12V. If you're interested in programmable circuits definitely check out Arduino, Raspberry Pi, and others. PARTS LIST R1 100kΩ R2 1kΩ R3 47Ω R4 10kΩ C1 0 Normal values for R3-R12 are 220Ω, 330Ω and 390Ω for 5V, 9V and 12V power supply, respectively. Modifications include altering the values of R3-R12. 10 watt and 12 volt LED will work,or you have another type of flasher circuit using 10watt and 12 volt LED ? It operates by building current in the inductor through a saturated transistor, and then cutting the transistor off and letting the flyback current flow through the LED. The circuit The resistor R, and Capacitor C, determines the timing of the flasher, and the period is proportional to R × C. This circuit also has a CDU to help move the points, if required. With minor modifications, the circuit can also be powered from 5V or 12V power sources. This circuit uses a BC557 PNP transistor connected to a BC547 NPN transistor in such a way so that the BC547 conducts for a very brief time making the LED light. Vicky Nov 19, 2017 Log in or register to post comments; Hey Aswinth, can you help me guiding as if i want to run this circuit with 12 volts. This is not programmable. LED Flasher Here is a LED Flasher circuit. 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