Recicled old computer Regulable power supply.
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Step 1: Electronics1
Identify the wires and eliminate what you don't need.
Step 2: Electronics2
Connect 230V ac input directly with electronic board. Then use the switch to control ON/OFF with green wire.
Step 3: Elecronics3
Build or buy the regulator circuit.
Step 4: Monting1
Mount all electronics like the schematics.