Two-wire Lamp Flashers

Published:2013/7/23 21:04:00 Author:muriel | Keyword: Two-wire, Lamp Flashers | From:SeekIC

Parts:R1 6K8 1/4W ResistorR2 270K 1/4W ResistorR3 22K 1/4W ResistorC1 220µF 25V Electrolytic CapacitorC2 10µF 25V Electrolytic CapacitorD1 1N4002 100V 1A DiodeQ1 BC557 45V 100mA PNP TransistorQ2 BD139 80V 1.5A NPN TransistorLP1 Existing filament Lamp: any type in the range 3-24V 10W max.SW1 Existing On-Off switchB1 Existing V DC source: any type in the range 3-24Vsuited to the lamp adopted Device purpose:This circuit has been designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply.Especially suited for car or panel pilot lights, this device can drive lamps up to 10W. Notes:Break lamp(s) to negative supply connection(s), then insert the circuit between existing lamp(s) connection(s) and negative supply (respecting polarities!).C1 value can be varied from 100 to 1000µF or higher, in order to change flashing frequency.Although rather oversized, this circuit can also drive any LED, providing a suitable resistor is fitted in series with the light emitting device.The resistor should be in the range 47R to 2K2, depending on supply voltage



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