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International Journal of Electrical and Power Engineering
Year: 2008  |  Volume: 2  |  Issue: 2  |  Page No.: 81 - 84

The Study, Design and Construction of Laboratory Power Supply with Adjustable 723 Regulator Chip

R.A. Adenodi, O.O. Alabi, B.F. Akinwale and F.O. Akinluyi    

Abstract: The necessary d. c. supply for electronics instrument may be drawn from batteries. However, the e.m.f. of batteries is not usually constant throughout life and also there is the danger of leakage which may endanger both the electronic circuit and the users. Power supply is a constant d.c voltage source suitable for operating electronic instruments without the danger associated with batteries. The 14-pin DIL (ľA723A) version of voltage regulator IC was incorporated to continuously monitors the d.c voltage output and automatically holds it constant irrespective of changes in the load current and unregulated input voltage. A divided fraction of the output voltage is compared with a fraction of the stable voltage reference to give a current of 150mA, which is boasted to 500 mA by an external transistor. The unit has excellent stability.

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