$ 2 PCB Prototype: https://jlcpcb.com/
Save $ 5 off with the discount code "JLCPCBJP"

I explained the circuit of the AC adapter. Here and there for advanced users.
Circuit configuration
Fuse → Thermistor → Input filter → Diode bridge → Electrolytic capacitor → Flyback converter (transformer, MOSFET, diode) → Electrolytic capacitor → Inductor
Twitter:   / ichiken_make  

Equipment used (including amazon associate link)
Oscilloscope https://amzn.to/2T958Vn
Voltage differential probe (also available on ebay) https://amzn.to/2wSCu2v

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