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Power supply is a
broad term but this lesson is restricted to discussion of circuits that
generate a fixed or controllable magnitude dc voltage from the available form
of input voltage. Integratedcircuit (IC) chips used in the electronic circuits
need standard dc voltage of fixed magnitude. Many of these circuits need
well-regulated dc supply for their proper operation. In majority of the cases
the required voltages are of magnitudes varying between -9 to +9 volts. Some
equipment may need multiple output power supplies. For example, in a
Personal Computer one may need 3.3 volt, ±5 volt and ±9 volt power supplies. The digital ICs may need
3.3volt supply and the hard disk driver or the floppy driver may need ±5 and ±9 volts supplies. The
individual output voltages from the multiple output power supply may have
different current ratings and different voltage regulation requirements. Almost
invariably these outputs are isolated dc.voltages where the dc
output is ohmically isolated from the input supply.
9V S.M.P.S. Power Supply
• Input: 2-pin, 100-265Vac, 47-63Hz.
• Output: 9VDC, 500mA.