Category Archives: theory about components

Teardown and trouble shooting an anti-mice beeper

Posted on 19 december 2017 by pa4tim

This is a dead anti mice thing you plug in a mains outlet. I had a dead one and was curious what was inside. The problem was a dead cap and some burned contacts. I wanted to know the kind … Continue reading →

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Measuring inductor-cores and transformers

Posted on 25 september 2013 by pa4tim

OK, you say, I have a LCR meter or a bridge so that’s a piece of cake. But inductors are kind a tricky when it comes to measuring. Especcially when they use core material. When I talk about inductors on … Continue reading →

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All about ESR measurement

Posted on 12 oktober 2012 by pa4tim

ESR is not new. It is not magical, it is not complicated. So it should be easy to measure. Just buy one of the those 50-100 Dollar wonderboxes and you can measure it. But do you now what you are … Continue reading →

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Condensators meten zonder LCR

Posted on 17 december 2010 by pa4tim

Ook zonder LCR meter kan de de waarde van een condensator bepalen. De meest bekende manier is natuurlijk om er een bekende spoel aan te hangen en dan de resonantie frequentie berekenen maar het kan simpeler. Een condensator heeft een … Continue reading →

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DC leakage and reforming electrolytic caps

Posted on 17 november 2010 by pa4tim

This page is one of my pages about electrolytic caps. In this case DC leakage. Instead of just replacing caps to be sure, I wanted to measure the DC leakage and for most be able to reform them. Electrolytics have … Continue reading →

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Weerstanden zijn niet altijd wat ze lijken

Posted on 12 november 2010 by pa4tim

Iedereen weet dat sommige weerstanden voor HF meer of minder geschikt zijn maar wat zijn nu precies de effecten en eigenschappen. Koolweerstanden kunnen tot hoge frequenties gebruikt worden. Hou wel de pootjes zo kort mogelijk. Metaalfilm is helemaal mooi. Draadgewonden … Continue reading →

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Condensators

Posted on 6 november 2010 by pa4tim

We weten allemaal dat een condensator een reactantie heeft. Neemt de frequentie toe dan neemt de reactantie af. Dat is wiskundig te berekenen. Maar wat is er nu mooier dan het gewoon zichtbaar te maken. Hoe lager de trace hoe … Continue reading →

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Replacing Electrolytic caps …or not ?

Posted on 6 november 2010 by pa4tim

Electrolytic capacitors (=caps in this text) are parts that often cause problems. So worth the troubles to check them while doing a restoration.  The general opinion is replacing all caps.  Often not a bad idea but also a bit over … Continue reading →

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