➢Step descriptions:
✦Step 1:-Prepare these materials below:
13005 transistor (from cfl circuit), any power transistor will work.
![](https://cdn.hackaday.io/images/3319071564989180997.jpg)
1N4007 diode.
![](https://cdn.hackaday.io/images/9425701564989189914.jpg)
10nf 2KV capacitor, any 2KV capacitor will work.
![](https://cdn.hackaday.io/images/9478961564989198613.jpg)
1K resistor.
![](https://cdn.hackaday.io/images/2153391564989209344.jpg)
12-0-12 step down transformer.
![](https://cdn.hackaday.io/images/5483571564989222266.jpg)
✦Step 2:-Here is the circuit diagram.
![](https://cdn.hackaday.io/images/2947291564989238094.jpg)
✦Step 3:-Connecting the 1K resistor to the Base.
![](https://cdn.hackaday.io/images/1789231564989247124.jpg)
✦Step 4:-Connecting 11 diodes in series.
![](https://cdn.hackaday.io/images/3215491564989261204.jpg)
✦Step 5:-Connect all capacitors as in the circuit diagram.
![](https://cdn.hackaday.io/images/6161181564989270574.jpg)
![](https://cdn.hackaday.io/images/6397321564989279829.jpg)
![](https://cdn.hackaday.io/images/303601564989288614.jpg)
✦Step 6:-Connect the 3.7v battery and test it.
![](https://cdn.hackaday.io/images/2925791564989307343.jpg)
![](https://cdn.hackaday.io/images/6483611564989314239.jpg)
Product list:
『Step-down transformer』
『11x10nf capacitor』 view more ⇒https://www.utsource.net/itm/p/8689000.html
『11x1N4007 diode』 view more ⇒https://www.utsource.net/itm/p/8035986.html
『1K resistor』 view more ⇒https://www.utsource.net/itm/p/6479527.html
『13005 transistor』 view more ⇒https://www.utsource.net/itm/p/8039008.html
Video on Youtube: