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  1. autir

    LM78XX & LM79XX questions

    Thank you for your answers.  :)
  2. autir

    Opinion on a brand of solder wire

    http://www.alphametals.com/distributors/pdfs/200381648.pdf
  3. autir

    ElCheapo PSU

    What do you mean "wired seperately"? If there is a resistor an the tab of the TO-220s and the heatsink is soldered to the neutral of the board, won't we have unwanted current flowing through the heatsink? So you propose that the best place for an ammeter in this circuit is the one in the picture?
  4. autir

    Opinion on a brand of solder wire

    Can a solder wire be both "no clean" and "rosin cored"? I have read on some articles in the Internet that "no clean" solder wire must be avoided at all costs. Why could make them say it?
  5. autir

    LM78XX & LM79XX questions

    Guys?  ::)
  6. autir

    Opinion on a brand of solder wire

    What is no-clear, rosin-based etc. flux? Are there types of flux which are corrosive and must be avoided at all costs? If so, why are they in production? What should we pay attention to when buying solder wire? Ok, here goes a specialised question
  7. autir

    PC speakers amp with TEA2025

    It works. Perfect  :D It was the unshielded copper wire which, in conjuction with the thousands  :P of crocodile clips, caused the hum. I put it in a box and added all the necessary connectors. One of these days I'm going to borrow a digital camera from a friend and take some snapshots...
  8. autir

    ElCheapo PSU

    It worked! I attached the power resistor directly to the breadboard and measured the voltage across its ends. It was 4.87V, dropping as the IC began to heat up and became stabilised at 4.78V. In the lab I've attended we were used to work with external and/or PSU ammeters + voltmeters, plus a...
  9. autir

    Stripboard CAD

    Click on the "Search" button  :D http://www.electronics-lab.com/forum/index.php?action=search
  10. autir

    ElCheapo PSU

    Can't I build it on stripboard?  :-\ Why very close to and not exactly 0 V? I have not used thermal paste yet. I have seen PSUs which had ammeters and voltmeters. How do they do it? I thought I should install an ammeter in order to monitor the power consumption of my circuits. It is supposed...
  11. autir

    Electret microphones characteristics

    Can you explain this a little bit more?  :-[  ;D How? As a resistor? Isn't Zout=R2//R1//Zmic ?
  12. autir

    PC speakers amp with TEA2025

    A big mistake from my part: Whenever you saw "power ground" in my last two posts, read "power neutral" instead. So the neutral cable of the LM7805 is connected (via capacitors, circuit etc.) both to my PC line-out ground and to the output speakers' ground. I have not grounded my LM7805's circuit.
  13. autir

    LM78XX & LM79XX questions

  14. autir

    ElCheapo PSU

    Something is wrong
  15. autir

    Latest Multisim ?

    Which version of Multisim is newer? 7 or 2001 ?
  16. autir

    Stripboard CAD

    I found it. I am downloading it as I write. http://www.electronics-lab.com/forum/index.php?topic=3757.msg23676#msg23676 Thanks!
  17. autir

    "Line In" requirements

    In a "typical" (if such a thing exists) Line-in interface -> What is the input impedance ? -> What is the Vp-p(max) ? -> Do PC Soundcards' specifications differ? Thank you.
  18. autir

    Electret microphones characteristics

    Quoting from http://www.epanorama.net/circuits/microphone_powering.html: -> How exactly is Zout calculated? -> What is the internal Z of a typical electret capsule? -> What is a typical Vp-p value produced from such a circuit? Thank you.
  19. autir

    veroboard pen: minor cuts and failure :'(

    I know there are some Greeks among the members of this forum. Can anyone please tell me where I can find a Strip Board Cutter or something similar in Athens? Thank you.
  20. autir

    Electronic Videos or software for learning?

    Hi ducestaley85 I doubt that there are educational videos for electronics. And even if they exist, they will be much inferior to a good book. If you want to begin studying electronics, you should go to a bookshop and buy a book of basic electronics: theory and simple circuits with diodes...
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