Welk, E. E.,  author. <br/><br/>
First principles of PC power supplies/ 
E. E Welk jr. 
 - [Place of Publication not known] :  WELX Technologies,   1993. 
 - iii, 24 pages :  illustrations ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Power supply.