From winton at ece.msstate.edu Wed Feb 6 21:29:17 2008 From: winton at ece.msstate.edu (Raymond S. Winton) Date: Wed Feb 6 20:34:17 2008 Subject: [ece3283] Re: Electronics HW#4 In-Reply-To: <1202333268.47aa2654dce21@webmail.msstate.edu> References: <1202333268.47aa2654dce21@webmail.msstate.edu> Message-ID: <47AA7B0D.8030208@ece.msstate.edu> The diode homework set was being rebuilt. The updated version is 4.0. The diode homework set that is due Fri set is (now) #hw4a, and is a somewhat different set of problem exercisess than before. HW permissions were reset at 4:33PM. It is now 8:32PM. Should be accessible. -RW ----------------- jaj159@msstate.edu wrote: > Dr. Winton, > I am still having difficulty accessing the HW#4 link on your website. It keeps > giving me the following error. > > Forbidden > You don't have permission to access /~winton/classes/ece3283/hwx/diodehw.pdf on > this server. > > > -------------------------------------------------------------------------------- > > Apache/2.2.4 (Unix) mod_ssl/2.2.4 OpenSSL/0.9.7a DAV/2 PHP/5.2.1 mod_perl/2.0.3 > Perl/v5.8.5 Server at www.ece.msstate.edu Port 80 > From winton at ece.msstate.edu Thu Feb 7 09:03:44 2008 From: winton at ece.msstate.edu (Raymond S. Winton) Date: Thu Feb 7 08:08:42 2008 Subject: [ece3283] Re: [ece3283-01] HW#4 question In-Reply-To: <002c01c8694b$230a4b40$6401a8c0@cattleboss> References: <1202333268.47aa2654dce21@webmail.msstate.edu> <47AA7B0D.8030208@ece.msstate.edu> <002c01c8694b$230a4b40$6401a8c0@cattleboss> Message-ID: <47AB1DD0.1080802@ece.msstate.edu> Thanks. copy/paste error. Also was in prob 10-3. Should be fixed now. -RW -------------------------- Nathan Smelser wrote: > Dr. Winton- > Is there a mistake on hw question 10-2 where Vd for the ideal > rectifier is assigned a value of 0.7V (instead of 0.0 V)? > > Thanks, > Nathan > > > ----- Original Message ----- From: "Raymond S. Winton" > > To: > Cc: > Sent: Wednesday, February 06, 2008 9:29 PM > Subject: [ece3283-01] [ece3283] Re: Electronics HW#4 > > >> >> The diode homework set was being rebuilt. >> >> The updated version is 4.0. The diode homework set that is due Fri >> set is (now) #hw4a, and is a somewhat different set of problem >> exercisess than before. >> >> HW permissions were reset at 4:33PM. It is now 8:32PM. Should be >> accessible. >> >> -RW >> >> ----------------- >> >> jaj159@msstate.edu wrote: >>> Dr. Winton, >>> I am still having difficulty accessing the HW#4 link on your >>> website. It keeps >>> giving me the following error. >>> >>> Forbidden >>> You don't have permission to access >>> /~winton/classes/ece3283/hwx/diodehw.pdf on >>> this server. >>> >>> >>> -------------------------------------------------------------------------------- >>> >>> >>> Apache/2.2.4 (Unix) mod_ssl/2.2.4 OpenSSL/0.9.7a DAV/2 PHP/5.2.1 >>> mod_perl/2.0.3 >>> Perl/v5.8.5 Server at www.ece.msstate.edu Port 80 >>> >> >> >> _______________________________________________ >> ece3283 mailing list >> ece3283@ece.msstate.edu >> http://www.ece.msstate.edu/mailman/listinfo/ece3283 >> _______________________________________________ >> ece3283-01 mailing list >> ece3283-01@ece.msstate.edu >> http://www.ece.msstate.edu/mailman/listinfo/ece3283-01 > > From winton at ece.msstate.edu Fri Feb 15 17:17:23 2008 From: winton at ece.msstate.edu (Raymond S. Winton) Date: Fri Feb 15 16:22:04 2008 Subject: [ece3283] Re: Prob 10-12 (FWR plus capacitance) with load Message-ID: <47B61D83.4000104@ece.msstate.edu> Answer(s) to questions about prob 10-12 from queries this PM (1) VAC(rms) = Vp/sqrt(2), where Vp = peak voltage (input or output) (1a) Line voltage = 120VAC (which is an rms value). AC line frequency = 60Hz. (2) transformer: V2(rms)/V1(rms) = n2/n1 (3) RL is defined by the load (for which PL and VL are given) (4) Ripple: VR = Vp/(2fRC) for FWR (5) Vav = Vp - VR/2 (= approx Vp is VR = small.) -RW --------------------------- From winton at ece.msstate.edu Sun Feb 17 19:15:15 2008 From: winton at ece.msstate.edu (Raymond S. Winton) Date: Sun Feb 17 18:19:56 2008 Subject: [ece3283] Re: In-Reply-To: References: Message-ID: <47B8DC23.8080808@ece.msstate.edu> Prob 10-19 is just like prob 10-10, except the VB(max, min) is now a VC(max, min). The resistance R = R1(drop-down) + RLoad. For Prob 10-20 the VR is in error because the coils were interpreted as voltage sources rather than current sources. If treated as voltage sources then the VR = 0.5Vp. So your answer should be correct. -RW --------------------- rob cochran wrote: > Dr. Winton, > This is Rob Cochran, who talked with you yesterday afternoon with > Jason Simmons outside of Simrall. > We were working on the homework and had a couple of questions. Thanks > for helping us outside yesterday. > > On 10-19 we said Vp is 15, Vc(min) was 12v, so the average of these > is 13.5v. Since the diode burns up 9volts, this leaves 4.5V to drop > across the resistor. 4.5/60ohms (60 ohms is for resistor) gives a > current of .075 amps. this then can be multiplied by the 9 volts in > the zener diode to get 675mW. Can we just average the 12 and 15 volts > in the capacitor? Just wondering > > On 10-20, the alternator problem the V.p is said to be 17.4 Volts. We > obtained this by adding 11.6v up from the ground, 5v lost at the > resistor, and another .7 volts from the 'non-ideal' diode. In class > you gave us a formula for the ripple current in a 3 phase circuit. > Vripple=Vp (1-sin60), which ends up being Vp*.134. Your answer for > Vripple is much higher than this value and we had no clue how to > approach this problem considering the way the > example shows in finding Vripple. > > Thanks so much! > > > ------------------------------------------------------------------------ > Helping your favorite cause is as easy as instant messaging. You IM, > we give. Learn more. > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.ece.msstate.edu/pipermail/ece3283/attachments/20080217/7b6ea41d/attachment.html From winton at ece.msstate.edu Tue Feb 19 11:34:42 2008 From: winton at ece.msstate.edu (Raymond S. Winton) Date: Tue Feb 19 10:39:46 2008 Subject: [ece3283] Hw5 has been scored Message-ID: <47BB1332.4090305@ece.msstate.edu> and is in my my doorbox. And the solutions to all of the diode homeworks are now posted on the website, as is an old quiz#2 -with the same do-not-ask caveats as before. -RW From winton at ece.msstate.edu Tue Feb 19 22:39:57 2008 From: winton at ece.msstate.edu (Raymond S. Winton) Date: Tue Feb 19 21:45:00 2008 Subject: [ece3283] HW #6 (not for turn in) solutions Message-ID: <47BBAF1D.7050605@ece.msstate.edu> Are posted with the other sets. -RW ------------------- From winton at ece.msstate.edu Thu Feb 28 18:19:05 2008 From: winton at ece.msstate.edu (Raymond S. Winton) Date: Thu Feb 28 17:23:52 2008 Subject: [ece3283] HW questions Message-ID: <47C74F79.4060006@ece.msstate.edu> *T-7 and T-8:* Keep in mind that the -3dB corner corresponds to |T| = (Tmid)/sqrt(2). *T-8: * you have to read the corner frequencies from the plot. And the x-axis is a logarithmic scale so you have to estimate the values of fL and fH. -RW ---------------------