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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> Sender: <speff@cr38156-a.wlfdle.phub.net.cable.rogers.com> From: "Spehro Pefhany" <speff@interlog.com> Subject: Re: V regulator input cap size? Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical References: <3db451b5.4005327@news.texas.net> <0001HW.B9D9CD54001A5D15163F7590@news.covad.net> <ap3pl4$rf35$1@hades.csu.net> <0001HW.B9DAE8B7003F6E14163F7590@news.covad.net> <mhgw9.118991$mxk1.104221@news04.bloor.is.net.cable.rogers.com> <3DC1A954.6080404@nospam.com> <1%hw9.136243$Q3S.53471@news01.bloor.is.net.cable.rogers.com> <3DC1AF48.40408@nospam.com> <3DC1C89E.2000908@nospam.com> <3dc2c7b4.14387664@news.texas.net> <3DC1DBEA.2000307@nospam.com> <3dc313c5.99409189@news.texas.net> Organization: Rather User-Agent: tin/pre-1.4-19990216 ("Styrofoam") (UNIX) (Linux/2.2.14 (i586)) Message-ID: <DvOw9.135774$mxk1.70487@news04.bloor.is.net.cable.rogers.com> Date: Sat, 02 Nov 2002 11:17:55 GMT NNTP-Posting-Host: 24.112.78.0 NNTP-Posting-Date: Sat, 02 Nov 2002 06:17:55 EST In sci.electronics.design John Fields <jfields@texas.net> wrote: > > I've deleted the current limiting resistors for the LED's since > they'll probably be driven by the 555's, but it shouldn't matter > because they'll be on the 555 outputs and the current for them will > have to be supplied by VLOGIC in any case. I suggest open collector drivers allowing unregulated power to them, and keeping the shunt regulator current down. Either the 200x driver I suggested or "digital" transistors would work nicely. I doubt the zener will have to be more than a single 500mW or, at most, a cheap 1W unit. By keeping the series resistor high in value the shunt regulator can withstand huge transients (MOF resistor, preferably) without requiring expensive TVS barnacles, inductors or other such stuff. I'd also prefer to keep the Vreg current as constant as possible, as 555s are sensitive to voltage variations within their timing cycle. If the LEDs actually alternate (one on/one off always) it's even possible to use the LED current for the zener regulator, at some expense in the driver circuitry. (BTW, I'm NOT going to do a detailed design, the information is too sketchy, my aim was to show a concept not to complete a design, and I don't have time right now to make arbitrary assumptions and labor to satisfy the resulting constraints. The process is obvious to anyone "skilled in the art" as the patent guys say, and we've shipped a lot of product with similar designs, so *I* know it works very well indeed). > Also, I've added R2 to > limit the current through the 12V relay coil. (A slight oversight > on Spehro's part, I'm sure!-) Not an oversight, John. I recommend changing the relay for a 24VDC one by using a very small filter cap for the relay coil eg. 22uF/50V (NONE will actually work with virtually all DC relay designs). A resistor was mentioned in the text, but I don't think it will be required. A 24V coil relay will cost about $0.005 more, in 10K quantity, than a 12V coil relay, but I think it is worth it to keep all the power in the coil. ;-) Fred: Sorry about changing the "rules" in order to get an elegant and reliable design that can be produced cheaply. (rest of John's detailed analysis deleted for brevity) Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>