Universal USB port adapter with regulator
Many micro-controller circuits are powered from the USB port. Supply voltage is usually less than USB five volts. Supply circuit has adjustable output voltage with few jumpers. Some circuits require two supply voltages, one for digital part and second for analog part. Jumpers and resistors are selected such that when no jumper is inserted, the output voltage will be at minimum level. This prevents electronic circuit from damage when jumpers are forgotten. It’s shown in schematic:
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