Close or Esc Key

Arduino Projects   |   Raspberry Pi   |   Electronic Circuits   |   AVR   |   PIC   |   8051   |   Electronic Projects

Mini Emergency Lamp

Description

Comments

The voltage across a 1watt LED is 3.3v   The emitter-collector voltage-drop across the transistor is 0.2v   This gives 4.5v - 3.5v = 1 volt for the 10R resistor. The 10R resistor will only allow 100mA to flow - not the required 330mA.  The circuit has never been tested. 

 

well i have tested this circuit on circuit simulation its ok and working 

i am using nokia mobile charger as (ac to dc ) source

using 4v 500ma  sealed lead acid battery  

but the led is always on irrespective of ac source 

wel bd 140 is not working in this circuit .....

8550 did the job 

 

 

thanks

Add new comment

Filtered HTML

  • Web page addresses and e-mail addresses turn into links automatically.
  • Search Engines will index and follow ONLY links to allowed domains.

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.
CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Image CAPTCHA
Enter the characters shown in the image.