Flasher Circuit

Replacement of burnt LML vespa flasher costs around $ 2.5. The flasher can be replaced with the help of the circuit sows here. It costs around $1.2.

Circuit Description of LML Vespa Flasher

The circuit of LML vespa flasher consists of a multivibrator built around transistors T1 and T2. The time period of the pulse can be varied by changing the values of R1, R2, C1 and C2. The values shows in the circuit are chosen to match the flasher with the flashers available in the market. Gates of TRIAC are connected to the collectors of T1 and T2 through 1k resistor.

circuit diagram of lml vespa flasher

 

When transistor T1  starts conducting, TRIAC1  is triggered and bulb1 starts glowing. This activates the buzzer. When T2  starts conducting, TRIAC2  is triggered, there by illuminating bulb 2. Thus the flashing of the bulbs (bulb1 and bulb2) takes place alternately and the buzzer also sounds in unison with the frequency of flashing of the bulbs. In addition, the pilot lamp indicating the flashing of bulbs also glows.

For convenience, connection of the flasher, indicating the colour of wires to be connected, is shown. The circuit works properly at 12V AC only. Only front right and rear right bulbs are shown in the circuit for simplicity.

PARTS LIST OF LML VESPA FLASHER CIRCUIT

Resistor (all ¼-watt, ± 5% Carbon)

R1, R2=  = 17 KΩ

R3, R4  = 1 KΩ

Capacitors

C1, C2  = 33 µF, 63V (Electrolytic Capacitor)

C3  = 1000 µF, 16V (Electrolytic Capacitor)

Semiconductors

T1, T2  = BEL 188S

TRIAC1, TRIAC2  = 226B

D1  = 1N4007

Miscellaneous

BULB1, BULB2  = 12V/21W

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