Schematics > Motor, light and power control > LED or Lamp Flasher
LED or Lamp FlasherMinimum parts counting
Designed for 3V battery operation
Parts:
R1_______33K 1/4W Resistor
R2,R3____47R 1/4W Resistors
C1_______10µF 25V Electrolytic Capacitor
D1,(D2)__LED(s) (Any type and color)
Q1_____BC560 45V 100mA PNP Transistor
Q2_____BC337 45V 800mA NPN Transistor
Notes:
- Power supply can vary from 2 to 4.5V.
- Add D2 to obtain two LED alternate blinking.
- D1's on-time is shorter than off-time. The opposite regarding D2.
- You can also use D2 only, shorting D1.
- Don't change resistors' values.
- Flashing frequency can be varied changing C1 value from 2.2µF to 100µF and
higher.
- This circuit is very efficient when driving a 3.2V lamp. In this case omit
the LEDs and R3, connecting the lamp at Q2's collector and to positive supply,
further reducing parts counting.
Title: LED or Lamp Flasher
Source: www.redcircuits.com
Published on: 2005-02-03
Reads: 336
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