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http://ir.futminna.edu.ng:8080/jspui/handle/123456789/23198| Title: | Design and Construction of a public Address (P.A) System With Automatic Back-up Power Supply |
| Authors: | ISTIFANUS, AUDU BAHAGO |
| Issue Date: | Nov-2005 |
| Abstract: | A Public Address (P.A) System into which an automatic back-up power supply unit is incorporated is designed and built. The preamplifier stage has a total voltage gain of 1033 .9. The input and output power of the P.A system are 27.23W and 20.25W respectively. Also the P.A system has an efficiency of 74.37 %. The incorporated back -up power supply is a 12v dc supply from batteries (cells) which is linked up to a charging circuit with 15.94v out put voltage having a charging current of 2.50 A. The achieved back-up power supply unit makes the P A system reliable in the event of power failure from the mains. |
| URI: | http://repository.futminna.edu.ng:8080/jspui/handle/123456789/23198 |
| Appears in Collections: | Chemical Engineering |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| OCRelect7.pdf | 19.16 MB | Adobe PDF | View/Open |
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