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Car Bulb Power Flasher
Devices of this kind are particularly suited for road, traffic and yard alerts and in all cases where mains supply is not available but a powerful flashing light is yet necessary.
Car Bulb Power Flasher Circuit Diagram:
![Flash]()
Notes:
Car Bulb Power Flasher
Derived from the Two-wire Lamp Flasher design, hosted on RED Free Circuit Designs since 1999, 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 is not available but a powerful flashing light is yet necessary.
Car Bulb Power Flasher Parts List:
| Parts | Description |
| 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) |
- 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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