But in an emergency or in the wake of a disaster, a working cell phone or GPS can be a life saver and it would be wise not to count on the availability of a clean, reliable USB power supply.

Don't populate JP1 jumper until you regulate this module output voltage. Power on J1 with a voltage between 8 and 28 Vdc, be carefull about polarity. Then regulate output to 5Vdc with potentiometer on ...

When PS_ON# is pulled to TTL low, the power supply should turn on the five main DC output rails: +12VDC, +5VDC, +3.3VDC, -5VDC, and -12VDC. When PS_ON# is pulled to TTL high or open-circuited, the DC ...