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.
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
Resistor (all ¼-watt, ± 5% Carbon)
R1, R2= = 17 KΩ
R3, R4 = 1 KΩ
C1, C2 = 33 µF/63V
C3 = 1000 µF/16V
T1, T2 = BEL 188S
TRIAC1, TRIAC2 = 226B
D1 = 1N4007
BULB1, BULB2 = 12V/21W