This project provides a simple DC Power Supply from an input power supply of 7-20 V AC or 7-30V DC.
Two DC voltage outputs are available; one is a fixed regulated 5V for TTL use. The other output is variable from 5V upwards. The maximum output voltage depends on the input voltage. The specified maximum input DC voltage to the regulator is 35V. The minimum input voltage must be 2 volts higher than the regulated output voltage.
Circuit Diagram:
DESCRIPTION:
The DC Power Supply circuit is based around the 7805 voltage regulator. It has only 3 connections (input, output and ground) and itprovides a fixed output. The last two digits of the part number specify the output voltage, eg. 05, 06, 08, 10, 12,15, 18, or 24.The 7800 series provides up to 1 amp load current and has on-chip circuitry to shut down the regulator if any attempt is made to operate it outside its safe operating area.A variable 500 ohm potentiometer is used to vary the output voltage from a minimum of 5V up to the maximum DC voltage depending on the input voltage. It will be about 2V below the input DC voltage.)The second 7805 has a resistor divider network on the output. A variable 500 ohm potentiometer is used to vary the output voltage from a minimum of 5V up to the maximum DC voltage depending on the input voltage. It will be about 2V below the input DC voltage.)
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