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  1. P

    cap tester repair

    the eye tube flickers, like its trying to close. i'am going to measure voltages on the two tubes, I know their off. yes, I have the manual.
  2. P

    cap tester repair

    I decided to change the electros and the 6BN8. alas, no joy.
  3. P

    cap tester repair

    the second and third adjustment procedures produces no eye tube closure. I did not need to replace the two main electros.
  4. P

    cap tester repair

    hi all, I have a Heathkit IT-11 i'am restoring. i'am at the point where I need to calibrate the leakage pots. the elecroylytic pot adjust fine for 2ma. the mini electroylytic and the non-electro pots can not be adjusted. the mini electro needs to be adjusted to 15ua and non-electro to 2ua...
  5. P

    Motor controller ic

    yes, I did read the data sheet. what I need is a explantion of how this ic works in a dvd player. the data sheet doesn't provide this.
  6. P

    Motor controller ic

    hi, anyone up to the task of detailing the complete operation of the AM5888S motor controller ic?
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    German translation

    thanks so much for your responses. I only gave the 3 single words because those 3 words flash on/off the whole time the meter is on. thsnks, again. pg
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    German translation

    ±thanks guys for responding and for the translation. but i'am still confused as how that relates to the esr meter?
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    German translation

    hi, just finished making the german designed Sprut esr meter. the words I need translated are: messe, lade, entlad. can anyone help?
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    repair parts

    hi forum members, I have a Tivoli One BT radio and I need to find a source for repair parts. does anyone know of a source?
  11. P

    Esr Meter Build

    hi all, b4 this thread ends, I just want to say how much I enjoyed it. thank you to all who contributed. I really learned a lot. thanks again. till next time. pete
  12. P

    Esr Meter Build

    hey steve, well, you're right about the freq. it went up a lot. the problem now is I can't get enuf gain out of u1b. the result is I can't zero the meter. I tried putting another 1k across r7, no change in gain.
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    Esr Meter Build

  14. P

    Esr Meter Build

    hi alec, the original schematic for this esr meter had a 39k across pins 6&7.
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    Esr Meter Build

    hi edd, thank you for the input. actually, the u1b is running on a reg 9v. does the gain of u1b go up with a higher value resistor? I opted not to use r8,r13 and one 20k pot for zero adjust. the gain now with the r3 change just barely moves the meter pointer with the leads shorted.
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    Esr Meter Build

    ok alec, changed r3 to 200k. the output voltage dropped dramatically, now output at test leads is 245 mv. whoopee!! the side effect however is that as steve noted the gain of the second op amp has to be increased. I think the resistor between pins 6&7 needs to be adjusted. theres a 39k there...
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    Esr Meter Build

    I'll try the resistor first as that is easier to get at. thanks guys.
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    Esr Meter Build

    boy, that's a great idea steve. now I don.t know which mod to try first.
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    Esr Meter Build

  20. P

    Esr Meter Build

    hi alec, i'am going to change that resistor tonight and will post back. will the change increase /decrease freq?
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