Electronic projects


you are here: home page :: projects :: Light & LED :: LED applications :: LED or Lamp Flasher

LED or Lamp Flasher

Minimum parts counting
Designed for 3V battery operation

Circuit diagram

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.

author: RED Free Circuit Designs
e-mail:
web site: http://www.redcircuits.com
project categories:
folder Audio (49)
folder Power & high voltage (43)
folder Radio (23)
folder Light & LED (31)
folder Tools & measurement (40)
folder Telephone (18)
folder Automotive (10)
folder Microcontrollers (12)
folder Sensors & control (47)
folder Timers & oscillators (40)
folder Miscellaneous (26)

StumbleUpon button

Share this page
Bookmark and Share
project subcategories:
All subcategories
music & light
LED applications
other

similar projects:
6V Ultra-Bright LED Chaser
Bicycle back Safety Light
Dancing LEDs
Dark-activated LED or Lamp Flasher
Fading LEDs
Knightrider lights for model cars
LED Chaser
LED or Lamp Pulser
LED Torch
LEDs or Lamps Sequencer

recently added projects:
Doorbell for the Deaf
High Quality Intercom
Combinational Conjuring Trick
POT-PLANT POWER
Ultrasonic Dog Whistle
Quiz Circuit
LED Torch
Insect Repellant
Speaker Microphone Circuit
Magic Wand Conjuring Trick.

most popular projects:
Led display digital Voltmeter
500W low cost 12V to 220V inverter
Low pass filter - Subwoofer
High And Low Voltage Cut Off With Time Delay
Metal Detector
2N3055 Power Amplifier
Basic UPS Power Supply
200W audio amplifier
LED Torch
100W RMS Amplifier


DIY Electronics Projects

Promote Your Page Too