Many time we do have old SMPS of no use to the computers. Those SMPS can be modified as bench-top power supply system providing -12,+12,+5,+3.3 volts. I have used one to power my all arduino based home automation modules and the Raspberry Pi. Here i am going to post how to mod an old SMPS .
You just need following components along with some basic tools
3.10Watt Resistive load (May be 5K or 10K i have used 4.7K working fine)
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