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  1. jmarko

    FZ111A and FZJ111 data

    Hello, friends! Please if anybody can help me with these old IC-s from Siemens: FZH111a and FZJ111 : what is their function, power supply and possible complement? Best regards, JMarko
  2. jmarko

    Hengstler 872C instruction manual

    Hi, boys and girls! Please can somebody help me to locate and achieve a copy of instruction manual for Hengstler counter 0 024 872C . Thanks for help, best regards to everybody at ENG-tips, Marko
  3. jmarko

    Choke Vs Filter

    Hi, czping! I think that inductors are used to filter out (or to smooth) current surges, mostly caused by load. And capacitive filters are used to filter out voltage disturbances, caused by lightning or other loads on supply line, that are source of voltage spikes (tyristor/triac or relay...
  4. jmarko

    Why does long wound cable draw more current?

    Hello, CraigD! Wires in cable have beside inductance also capacitance; closer wounds are stacked and more wounds, greater the capacitance. This capacitance leaks some AC current, even if no load is connected. But if length of cable is in range of few meters, it can be ignored. Best regards...
  5. jmarko

    Capacitor Charging- Where are all the electrons?

    Hi Cbarn24050! I think that what you have in mind is not a capacitor phenomenon, but body, charged by triboelectricity or radiation or some other way. Let me explain: capacitor always has two plates with dielectric material (or vacuum) inbetween and if we charge it, and then we remove plates...
  6. jmarko

    Capacitor Charging- Where are all the electrons?

    Dear IRstuff, thank you for yor opinion and I agree with it, it helped me to express better; I think that we are only describing the same picture with different words and that we are coming to final solution of what WhMcC answered: how are electrons distributed in charged capacitor. Also I...
  7. jmarko

    Capacitor Charging- Where are all the electrons?

    Hi, IRstuff! You are right, equations for capacitance are the same regardless the dielectric. But original question was: where are the electrons; and physical picture is not the same. In solid dielectric, charge carriers are distributed evenly in the material between plates - atoms and molecules...
  8. jmarko

    Capacitor Charging- Where are all the electrons?

    Hi, everybody! I think that key of how capacitor works is in material between metal plates : in dielectric . There is where really takes place a distribution of charge carriers (electrons or holes-positive charged atoms or molecules). And really, in solid dielectric, some atoms (or...
  9. jmarko

    Inductor selection criteria

    Hello, Mryan! Just explanation, why producers if inductors give data of saturation current in DC value (despite that in real circuits usually appears AC signal): it is much easier to measure inductance with small AC signal, superimposed to large DC signal, when measuring saturation values - and...
  10. jmarko

    Flashing LED diode driver

    Hello! I have recently dismantled rear red flash light for bicycle (it has functions :light OFF, ON and intermittent). It consists of 2032 battery, LED diode and transistorlike element (TO92 plastic housing, three pins) without any marks. Has anyone information, what this element might be (and...
  11. jmarko

    Pepi switch on/off operational life?

    Hi, Paul! sorry for previous message; please check also next sites: http://www.pepiusa.com/ , http://www.creasefield.co.uk/prod_ther.html. Best regards, Jmarko
  12. jmarko

    Pepi switch on/off operational life?

    Hi, Paul! What is Pepi Switch? Please describe application. Usually, mechanical switches have mechanical live expectancy cca. one third to twice more than electrical (for example, specific switch for 240V/2A withstands 100.000 ON/OFF operations actually switching 2A current and 130.000 or more...
  13. jmarko

    Hipot testing

    One way of measuring lenghth of imersed wire is to measure capacitance between water as one pole and wire as other pole.
  14. jmarko

    Transformers in parallel: What are the pitfalls?

    Hi, JonTalbain! If you reaaly can not find appropriate transformer, you can consider next tip: If you connect parralel multiple secondary windings on one transformer or even multiple transformers, as in your case, I suggest that you apply separate four-diode bridge (Graetz) to each winding...

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