This astonishingly simple circuit allows one or two powerful 12V 21W car bulbs to be driven in flashing mode by means of a power MosFet. Devices of this kind are particularly suited for road, traffic and yard alerts and in all cases where mains supply are not available but a powerful flashing light are yet necessary.
Schematic:
Parts:
R1 = 6.8K
R2 = 220K
R3 = 22K
C1 = 100uF-25V
C2 = 10u-25V
D1 = 1N4002
Q1 = BC557
Q2 = IRF530
LP1 = 12V-21W Car Filament Bulb (See Notes)
SW1 = SPST Switch (3 Amp minimum)
Notes:
Flashing frequency can be varied within a limited range by changing C1 value.
As high dc currents are involved, please use suitably sized cables for battery and bulb(s) connections.
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