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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It would be interesting to know what “The fuse” really is and what purpose it is there to serve. Semiconductor junctions can change when stressed.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>This brings up something which I feel is really important in electronics. Terms such as “Resistor”, “Capacitor”, “Transistor”, “Diode” , “Inductor” are really ideals of what the thing really is. Capacitors have inductance. Inductors have capacitance. Transistors and diodes have capacitance. Resistors have inductive properties. Conductors together on a board have all of the above. We need the ideals to simplify our thinking but we need to know – there is more to it than that. By the way, not all fuses are alike and none of the above die a natural death.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>A favorite experiment is that LED’s actually can produce current when exposed to light. This actually is important in developing LED lighting because light reflecting back into the LED can increase current and reduce efficiency. The other fun thing is that LED’s are sensitive to light in a near but not exact wave length to what they produce. A fun Arduino type project is to pulse an LED just a the margin of producing light. This builds a charge in the junction. The Arduino can measure this charge. The charge dissipates quicker if the LED is exposed to light near the wave length it emits. So where are the ideals now?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>This type of clip and measure process is one that I have used myself. Though, It can produce a poor customer response when the thing is “Fixed”. A more patient approach of observing whether voltages make sense on a schematic is another option.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>W1GCF<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Geoff<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> bars [mailto:bars-bounces@w1hh.org] <b>On Behalf Of </b>Tim KC1RET<br><b>Sent:</b> Monday, August 22, 2022 9:35 AM<br><b>To:</b> BARS Reflector<br><b>Subject:</b> [bars] When is a fuse not a fuse?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>The saga of my 'dead' TS-2000 continues.<br><br>So after hours of deciphering schematics and finally performing a radio autopsy on my kitchen counter I was struck with this conundrum... How could the supply voltage read 13.8v at the connector, but only 5.2 where the wire connected to the main board?<br><br>At first I suspected the filter caps. They are soldered directly to the back of the connector inside the radio, dead-bug style. I cut they leads, one-by-one and they were all good & no change to the voltage reading. In a fit of desperation, I checked continuity between the board and the back of the PS; + was good, GND, not-so-much. Huh?? It was measuring 2.5k ohm! I disconnected the PS lead from the radio, 2.5k between the PS lead connector and PS terminal. Ah HA! (he says - well, I really said something else quite a bit more expressive but I'll leave the specifics to your imagination) I pulled the inline fuse out - Yup, it read not open, not short, but 2.5k. I replace the fuse and the rig fired right up!<br><br>So, when is a fuse not a fuse? When it is a resistor!<br><br>That is a new experience for me -- I'm def. NOT going to forget it.<br><br>73,<br><br>T.<br><br><o:p></o:p></p><div><p class=MsoNormal>-- <br><br><o:p></o:p></p><p><span style='font-size:7.5pt;font-family:"Verdana","sans-serif"'>Courageously sent from a non-Apple device that <em><span style='font-family:"Verdana","sans-serif"'>includes</span></em> a headphone jack.<o:p></o:p></span></p><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="100%" align=center></div><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td style='padding:0in 0in 0in 0in'><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td width=150 style='width:112.5pt;padding:0in 0in 0in 0in'><p class=MsoNormal><a href="https://kc1ret.com/img/kc1ret-qsl-card-front-v3.png"><span style='text-decoration:none'><img border=0 width=130 id="_x0000_i1026" src="https://kc1ret.com/img/kc1ret-qsl-card-front-v2-sm.png"></span></a><o:p></o:p></p></td><td style='padding:0in 0in 0in 0in'><h3>Tim Carter - KC1RET<o:p></o:p></h3></td><td width=30 style='width:22.5pt;padding:0in 0in 0in 0in'><p class=MsoNormal> <o:p></o:p></p></td><td width=30 style='width:22.5pt;padding:0in 0in 0in 0in'><p class=MsoNormal> <o:p></o:p></p></td><td style='padding:0in 0in 0in 0in'><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td width=30 style='width:22.5pt;padding:0in 0in 0in 0in'><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><img border=0 width=13 id="_x0000_i1027" src="https://receptiveaudio.com/static/phone-icon.png"><o:p></o:p></p></td></tr></table></td><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><a href="tel:1.978.710.0133">+1.978.710.0133</a><o:p></o:p></p></td></tr><tr><td width=30 style='width:22.5pt;padding:0in 0in 0in 0in'><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><img border=0 width=13 id="_x0000_i1028" src="https://receptiveaudio.com/static/email-icon.png"><o:p></o:p></p></td></tr></table></td><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><a href="mailto:kc1ret.radio@gmail.com">kc1ret.radio@gmail.com</a><o:p></o:p></p></td></tr><tr><td width=30 style='width:22.5pt;padding:0in 0in 0in 0in'><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><img border=0 id="_x0000_i1029" src="https://receptiveaudio.com/static/link-icon.png"><="" td="" width="13"> <o:p></o:p></p></td></tr></table></td><td style='padding:0in 0in 0in 0in'><p class=MsoNormal><a href="https://kc1ret.com">https://kc1ret.com</a><o:p></o:p></p></td></tr></table></td></tr></table><p>"Computers are incredibly fast, accurate and stupid; humans are incredibly slow, inaccurate and brilliant; together they are powerful beyond imagination." -- <i>Albert Einstein</i><o:p></o:p></p><p style='-webkit-margin-after:.5em;-webkit-margin-before:.5em'><span style='font-size:7.5pt;font-family:"Verdana","sans-serif"'>Warning: Spelling errors in this message are the product of a poor school system. Pay teachures more than athletes.<br>IMPORTANT: This email is intended for the use of the individual addressee(s) named above and may contain information that is confidential privileged or unsuitable for overly sensitive persons with low self-esteem, no sense of humor or irrational religious beliefs. If you are not the intended recipient, any dissemination, distribution or copying of this email is not authorized (either explicitly or implicitly) and constitutes an irritating social fauxpas. No animals were harmed in the transmission of this email, although the mutt next door is living on borrowed time, let me tell you.<o:p></o:p></span></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>