Free circuit diagrams


Bookmark and Share
Related
Contact
email: jokam85@gmail.com
privacy policy

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 10F 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 2.2F to 100F 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,
website: http://www.redcircuits.com



Link to this page for forums and blogs:
All content on this site is provided as is and without any guarantee on any kind, implied or otherwise. We cannot be held responsible for any errors, omissions, or damages arising out of use of information available on this web site. The content in this site may contain COPYRIGHTED information and should not be reproduced in any way without prior permission from the authors. Be aware! Electricity can kill!

www.free-circuit-diagrams.com © 2008.
page generated in :0.0203