双线灯闪光灯电路--Two-wireLampFlasher

双线灯闪光灯电路--Two-wire Lamp Flasher
  Ideal to operate 3 to 24V DC existing border=0>
  Parts:
  R1______________6K81/4W Resistor
  R2____________270K 1/4W Resistor
  R3_____________22K 1/4W Resistor
  C1____________220?F 25V Electrolytic Capacitor
  C2_____________?F 25V Electrolytic Capacitor
  D1___________1N4002100V 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 1000?F 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.