Useful Components in the Base of a Burned Out CFL Light Bulb.

12,377

63

5

Posted in TechnologyElectronics

Introduction: Useful Components in the Base of a Burned Out CFL Light Bulb.

A burned out CFL home light bulb provides a nice little easter egg for the electronics hobbyist.
Just pry off the base with a jacknife inserted in the seam, and it comes apart easily.

The circular PC board contains a lot of usefull parts, apart from it being a ~700v switching power

supply, if it still works.  If the condition that caused the CFL to burn out is the CFL itself, you have a

complete set of components, otherwise, one (or more) of these components will be cooked. All

components are easily de-soldered from the pc board.

Check it out:

I have broken down the components and identified them.  I also detailed the 2 power transistors,
by providing info from the data sheet.

CFL: integrated power supply
----------------------------------------
Qty Description
2- DK45 Silicon NPN power switch transistor
PNP/NPN PCM (W) ICM  (A) BVCEO (V) BVCBO  (V) BVEBO  (V) IC  (A)

VCE  (V) min Max IC (A) IB  (A) max  (V) IC  (A) VCE  (V) f (MHZ) min (MHZ)

DIE SIZE  (mm2) PACKAGE
NPN 68 4 220 350 9 0.5 10 10 60

2.0 0.5 1.0 0.5 10 1 4 2.34×2.34 TO-220

1- 1 1/4" dia. pc board.
6- 1N4005 diodes
1-22uf 200v Electrolytic capacitor
1-10k resistor 5%
1-22k resistor 10%
2-1k resistors, 10%
1- 3N 471k 1kv ceramic capacitor 700pf
1- CBB18 poly film capacitor 1kv .47uf
3- CJB 104k poly film capacitor 400v  ?uf
1- mini transformer
2- mini choke coils
2-small 2"" leads of high temp thermal insulated wire.

Make sure that you properly recycle the CFL portion of the lamp. It is not very environmental friendly

since it contains Mercury.

Hope you get some usefull parts for your next project!

-CharlyV

Share

    Recommendations

    • Science of Cooking

      Science of Cooking
    • Pocket-Sized Contest

      Pocket-Sized Contest
    • Microcontroller Contest

      Microcontroller Contest
    user

    We have a be nice policy.
    Please be positive and constructive.

    Tips

    Questions

    5 Comments

    Can you tell what is the use of minI transformer...what are it's primary and secondary coil details. Thanks

    very helpfull instructable thanks.

    can these components be used to do this https://www.instructables.com/id/Phone-line-powered-flashlight/ project?

    very interesting, thank you!

    user

    Thank you! Very useful information!