<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1558011653934_30978"><span>Just remember, 50% of the people are under average intelligence.<br></span></div><div><span><br></span></div><div><span>If you really want to make a fancy battery tester, create one with a microprocessor that runs the battery through various load levels, then displays the resulting voltage as a graph on an LCD display.</span></div><div id="yui_3_16_0_ym19_1_1558011653934_30979"> </div><div class="signature" id="yui_3_16_0_ym19_1_1558011653934_30982"><span style="font-family:courier;">--- </span><br style="font-family:courier;"><span style="font-family:courier;" id="yui_3_16_0_ym19_1_1558011653934_30981">Wayne Johnson, | <span style="color:rgb(191, 95, 0);" id="yui_3_16_0_ym19_1_1558011653934_31055">There are two kinds of people: Those</span> </span><br style="font-family:courier;"><span style="font-family:courier;" id="yui_3_16_0_ym19_1_1558011653934_31053"> | <span style="color:rgb(191, 95, 0);" id="yui_3_16_0_ym19_1_1558011653934_31056">who say to God, "Thy will be done," </span></span><br style="font-family:courier;"><span style="font-family:courier;" id="yui_3_16_0_ym19_1_1558011653934_31005"> | <span style="color:rgb(191, 95, 0);" id="yui_3_16_0_ym19_1_1558011653934_31057">and those to whom God says, "All right, </span></span><br style="font-family:courier;"><span style="font-family:courier;" id="yui_3_16_0_ym19_1_1558011653934_31006"> | <span style="color:rgb(191, 95, 0);" id="yui_3_16_0_ym19_1_1558011653934_31058">then, have it your way." --C.S. Lewis</span><br></span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1558011653934_31007"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1558011653934_31062" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1558011653934_31061"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1558011653934_31060"> <div dir="ltr" id="yui_3_16_0_ym19_1_1558011653934_31059"> <font size="2" face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Mike Miller <mbmiller+l@gmail.com><br> <b><span style="font-weight: bold;">To:</span></b> TCLUG Mailing List <tclug-list@mn-linux.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Wednesday, May 15, 2019 11:01 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [tclug-list] [OT] where to get a 100-ohm resistor?<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1558011653934_31064"><br><div dir="ltr" id="yui_3_16_0_ym19_1_1558011653934_31063">This is really helpful. It answered a bunch of questions I had but hadn't <br clear="none">asked. People were commenting on that YouTube battery-testing video that <br clear="none">a 100-ohm resister wouldn't be right for a D battery, but I guess it also <br clear="none">wouldn't be right for a 9-volt.<br clear="none"><br clear="none">Looking at more info out there on the web -- it's a problem for me that a <br clear="none">lot of people don't seem to know what they are doing, but they are still <br clear="none">there, teaching the world. ;-)<br clear="none"><br clear="none">Thanks again, Doug.<br clear="none"><br clear="none">Mike<br clear="none"><br clear="none"><div class="yqt3865564807" id="yqtfd64870"><br clear="none">On Sun, 12 May 2019, Doug Reed wrote:<br clear="none"><br clear="none">> Yes, the Ax-Man stores are the place to look if you don't want to ask <br clear="none">> someone to mail it to you. I believe there are 3 or 4 stores around <br clear="none">> town. The only stores I am familiar with are in St Paul and Fridley, but <br clear="none">> I thought there was one more in Bloomington.<br clear="none">><br clear="none">> The color code for 100 ohms is brown-black-brown. But 100 ohms is too <br clear="none">> low for testing a 9V battery. 100 ohms is fine for testing 1.5 volt <br clear="none">> batteries at about 15 milliamp current load which is within the <br clear="none">> capability of all AAA or larger batteries.<br clear="none">><br clear="none">> But 100 ohms will attempt to draw about 90 milliamps from a 9V battery. <br clear="none">> Most 9V batteries are rated for 50 milliamps maximum load. Your 100 ohm <br clear="none">> resistor will tend to suck them down so they all fail your test. For a <br clear="none">> similar test effect, you should use a 1000 ohm resistor, perhaps even <br clear="none">> higher, up to 3000 to 5000 ohms so the load is proportional to the <br clear="none">> battery capability.<br clear="none">><br clear="none">> So when you are looking for the resistor at Ax-Man Surplus, the 100 ohm <br clear="none">> resistor should have Brown as the first band, black or brown or red for <br clear="none">> the second band, and Brown again for the third band. The bands are <br clear="none">> counted with the first band closest to one end.<br clear="none">><br clear="none">> The 1000 ohm resistor would have the third band colored Red instead of <br clear="none">> brown. Since we don't care exactly what the value is between 1000 and <br clear="none">> 5000 ohms, the first band can be any of Brown or Red or Orange, or <br clear="none">> Yellow, and we don't care at all about the second band color.<br clear="none">><br clear="none">> And I suggest that you look for a resistor that handles one-half watt <br clear="none">> dissipation or more. Your batteries should never approach that but the <br clear="none">> larger physical sizes are usually less likely to break from lots of <br clear="none">> handling. A half watt resistor is physically about 1/8" diameter and <br clear="none">> 1/2" long with leads about 1.5" on each end.<br clear="none">><br clear="none">> The size you pick isn't really critical, it is really just for ease of <br clear="none">> handling. You will probably find multiple examples to choose from, I <br clear="none">> just suggest you don't choose the smallest size you find. Any resistor <br clear="none">> larger than 1/2 watt will also work of course, if that is what you find <br clear="none">> or want. The much larger watt values usually have the resistor value <br clear="none">> simply printed on the side.<br clear="none">><br clear="none">> And of course buy more than one of each for when you break or loose one. <br clear="none">> :-)<br clear="none">><br clear="none">> Good luck. If my description isn't enough to work from, you can easily <br clear="none">> find web pages that explain the resistor color code. And you can always <br clear="none">> bring your voltmeter to the store and use it to check the resistor value <br clear="none">> before you buy. Or buy a handful of different values that have brown or <br clear="none">> red on the third band and check them at home. No matter what you choose <br clear="none">> to do, the parts will probably cost less than the gas to get you to the <br clear="none">> store.<br clear="none">><br clear="none">> Doug Reed.<br clear="none">> North St Paul.<br clear="none">><br clear="none">> -- <br clear="none">> Scientists say the world is made up of protons, neutrons, and electrons. <br clear="none">> They forgot to mention MORONS.<br clear="none">><br clear="none">> She had buried three husbands and at least two of them had already been dead.<br clear="none">_______________________________________________<br clear="none">TCLUG Mailing List - Minneapolis/St. Paul, Minnesota<br clear="none"><a shape="rect" ymailto="mailto:tclug-list@mn-linux.org" href="mailto:tclug-list@mn-linux.org">tclug-list@mn-linux.org</a><br clear="none"><a shape="rect" href="http://mailman.mn-linux.org/mailman/listinfo/tclug-list" target="_blank">http://mailman.mn-linux.org/mailman/listinfo/tclug-list</a><br clear="none"></div></div><br><br></div> </div> </div> </div></div></body></html>