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  1. P

    Esr Meter Build

    ed, I didn't use the center tap.
  2. P

    Esr Meter Build

    hi ed, yes, that's the transformer I used. I will check the pcb and post back. I think the 8 ohm side went to the first ten ohm resistor, but I'll check. steve, how can I implement your suggestion?
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    Esr Meter Build

    hi members, can someone explain what happens if you vary r6?
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    Esr Meter Build

    hi steve, good morning from sunny s. florida. I have some fast diodes I could use. will that drop the test voltage. btw, for anyone wanting to build this circuit, you can use a radio shack audio transformer( google modified ludens by dennis hill) I suspect that's why the test voltage is higher...
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    Esr Meter Build

    yes, they are in Spanish. thank god for babel fish. those diodes are there to discharge any charged caps you inadvertly test. are the diodes your suggesting have a high enough prv rating? I could delete them. I noticed the length of the test leads has a definite effect on the test voltage. I...
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    Esr Meter Build

    hi 73s, are you referring to the diodes across the test leads? I agree with the last sentence of your post. rarely do you probe a circuit that you have no concept of how it works. btw, can't read Spanish, should I ask for a translation?
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    Esr Meter Build

    steve, your right. but like all test equipment it has its limitations.
  8. P

    Esr Meter Build

    thanks, alec, i'll try that. I guess a voltage divider won't work. actually. if your aware of the limitations, esr meters work quite well. service techs have been using them for years to find bad caps in on board circuits.
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    Esr Meter Build

  10. P

    Esr Meter Build

    adam, where are you?
  11. P

    Esr Meter Build

    hi forum members, ijust completed a build of an esr meter. it is the ludens design by Manfred M. I would like to use this meter to check caps in circuit. the basic requirement for this is to keep the test voltage under .6v as to not bias on any semis in the area. i'am seeing about .5v at the...
  12. P

    pcb

    wow! that's awesome adam. thanks so much.
  13. P

    pcb

    thanks for your input. I used PAINT to erase the lines I didn't want to etch. worked good, I now will etch the board.
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    pcb

    here's the link http://www.vanade.com/~blc/html/hardware/esr/
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    pcb

    yes, that id so. my question is how do I print just the pcb tracks and not the parts?
  16. P

    pcb

    hi members, I need some advice on making a pcb. the board I want to make shows a top view with the componets shown. this is the only pcb shown. my question is, if I make this board won't the components layout be covered with resist and also be on the board? is there a solution to this?
  17. P

    isolation transformer

    hi hevans, thank you so much for your patience and help. I understand your advice and will follow your recommended suggestions. pete g.
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    isolation transformer

  19. P

    isolation transformer

    hi heavens, firstly, thank you muchly for your prompt reply. I want to make sure I understand. so, I should use the iso trans for the scope only? do not defeat the safey prong on the scope. does the dut need an isolation trans also? sorry, if I sound somewhat dense, but iam 77 years old, and...
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    isolation transformer

    hi, I would like info on how to use an isolation transformer. I have an rca and b&k iso transformer. I going to want to measure waveforms in a plasma tv. I'am going to be probing using both the hot and cold grounds. a friend of mine said I need to use two transformers one for the scope and one...
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