3 blue or white LEDs
1 100K 1/2W resistor
1 1N4004 Diode
1 dead (or not) C7 socket light bulb
3 inch of 1/2 " shrink tube
some hot glue
Paper tube (paper towel or toilet paper tube)
Step 2: Brake a C7 bulb but don't brake it!
This will be our base to attach the circuit
You need to brake the bulb, but, you must NOT brake the inside. To do this I inserted the bulb inside a used paper towel tube. and then squeezed the bulb using a vise. When the bulb is broken, it is possible to remove and brake away the rest of the glass, leaving the inside untouched.
Once you have the inside you can remove the tungsten filament, keeping the two leads.
Step 3: Preparing the LEDs
Make sure you have the long and short leads all in the same direction.
Solder the first long lead to the next short lead, and so on. Leaving you at the end with one long and one short lead not soldered. These two leads will be the negative and positive of the LEDs series.
Step 5: Solder the resistor and the Diode to the two bulb wires
One wire has the 100K 1/2W resistor.
The other wire has the 1N4001 diode.
Take note of the diode polarity, the output of the diode will have to go to the short lead of the LED module made before.
The resistor will go on the long lead of the LED module.