Desktop energy seed lamp

Step 30 Make the circuit

Parts you will need:
1 meter of white and 1 meter of black wirewrap wire 30 or 28 gauge
1 x Ferrite bead digikey part number 240-2145-ND
40 x High power LED
1x 1K resistor
1x 2N3904 or 2N2222 NPN transistor

You can use one color of wirewrap, having two colour will make you life easier.
I first starter using the same colour and took a marker to mark the second wire.
Having 2 colours helps you and me trying to explain.

Start by twisting both wire together. Then pass it in the ferrite bead and you will loop into the bead until physically you can not pass it anymore. You just made yourself a little transformer.

When that is done, you can go to the next page.

<-edit March 21, 2009->
Ps - Have a look at this link
http://hackedgadgets.com/2007/03/22/rusty-nail-led-night-light/

The guy use the same circuit and a rusty nail to make the coil! It works!

Comments

[Abadon125]

 Looks great so far, 1 question though.  What is the bead and homemade transformer for?  What does it do?

Thanks!!

[robomaniac]

the bead is the transformer core. Like any other transformer, you have a core to make the magnetic field move from the primary to the secondary.