24V flasher circuit


The circuit shown here works from 24V DC and can flash two 24V bulbs alternatively. The circuit is nothing but an astable multivibrator operating at 1Hz and 50% duty cycle. The lamp to be flashed is connected in place of the collector resistor (Rc) of a typical design. 2N3055 transistors which are well known for their ruggedness are used here. They can handle collector currents up to 10A. So a wide range of lamps (in terms of wattage) can be connected to this circuit.

Circuit Diagram.

24V flasher circuit


  • Assemble the circuit on a good quality PCB.
  • Use 24V DC for powering this circuit.
  • Lamp L1 and L2 can be 24V/25W type.
  • It is advised to fit the transistors with heat sinks.
  • Flashing rate can be modified by adjusting the values of R1, R2, C1 and C2.