Schematics > Motor, light and power control > Two-wire Lamp Flasher
Two-wire Lamp Flasher
Ideal to operate 3 to 24V DC existing on-circuit lamps
LED operation is also possible
Parts:
R1______________6K8 1/4W Resistor
R2____________270K 1/4W Resistor
R3_____________22K 1/4W Resistor
C1____________220µF 25V Electrolytic Capacitor
C2_____________10µF 25V Electrolytic Capacitor
D1___________1N4002 100V 1A Diode
Q1____________BC557 45V 100mA PNP Transistor
Q2____________BD139 80V 1.5A NPN Transistor
LP1___________Existing filament Lamp: any type in the range 3-24V 10W max.
SW1___________Existing On-Off switch
B1____________Existing V DC source: any type in the range 3-24V
suited 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.
Title: Two-wire Lamp Flasher
Source: www.redcircuits.com
Published on: 2005-02-03
Reads: 359
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