This simple flashing light circuit is powered with 6 volts/0.5A and has a low current consumption when the light bulb is off. The flashing frequency is set by only one capacitor. Transistor T1 may be replaced with BC160 and T2 with BC140.
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A random light display can be made with 4 [or more] mulivibrator circuits with different timing, using 50uf to 250 caoacitors. The outputs of these can be fed to 9 or more diode AND GATE circuits in different configurations to produce a totally random diplay. The effect is very pleasing to the eye. Mine was made using transistors throughout. I used a power supply to run 6 Volt 0.3A M.E.S. bulbs in holders. It has been used every Xmas since the year 2000, and still works well.
I have another question for you… Is it possible to make the circuit switchable Off – Flash – Continuous? As the frequency is controlled by the capacitor could I put a switch in that area (i.e. select between effectively zero and infinite capacitance, as well as 10uF)?
Thanks for the circuit. The capacitor symbol is unusual – is it polarised or not, and if so which end is which?
I plan to use the circuit in a bike dynamo & battery charger circuit.
It is polarised and the plus terminal is connected to the T1 base.
thx from your circuit.
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