Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!uwm.edu!linac!mp.cs.niu.edu!ux1.cso.uiuc.edu!kline
From: kline@ux1.cso.uiuc.edu (Charley Kline)
Newsgroups: sci.electronics
Subject: Power supply design
Message-ID: <1991Jun18.175131.8374@ux1.cso.uiuc.edu>
Date: 18 Jun 91 17:51:31 GMT
Organization: University of Illinois at Urbana
Lines: 16

Hi, we're trying to build a power supply for a device that requires 3A
at 13.8 volts. The voltage regulator will be an LM350T, a 3A-rated
variable voltage regulator.

The problem is the power transformer. I can't find anywhere a 3A
transformer at 18 volts.

My question is, am I guessing the secondary voltage wrong? Would a 14V
secondary be okay since that is the RMS value and the
rectified/filtered DC out of that would be sqrt(2) * 14 = 20V?


________________________________________________________________________
Charley Kline, KB9FFK, PP-ASEL                          c-kline@uiuc.edu
University of Illinois Computing Services          Packet: kb9ffk@ka9mnx
1304 W. Springfield Ave, Urbana IL  61801                 (217) 333-3339