Code Reading Lamp

Description

Table of Contents:

  1. Code Reading Lamp
  2. A Trick
  3. Transistor Coding
  4. Capacitor Coding
Contributor: 
D.Mohankumar

Here is a dual colour lamp to read the code printed on the Transistors and ICs. The code and number printed on the black coloured body of these components are difficult to read if the room light is low since the printing is in faint colour or as impressions. This LED lamp is useful to identify the components easily.

 
The circuit is a simple Monostable timer using NE555. With the timing components R1 and C1, the output of IC1 turns on and remains high for 2 minutes when S1 is pressed and released. Selector switch S2 is used to light either Red orWhite LED since some printing on the IC is more clear in Red light. Use a 12 volt mini battery like the one used in Car remote. If you have a Magnifier, attach the same to the unit.

Code Reading Lamp Circuit