Search results

Search Forums New Posts
  1. S

    Equalizer ...

    I assembled a kit a few year ago, for a friend, i belive he ordered it from germany, a realtime analyser, a simple one, it was based on a few IC:s and, if i remember right, 100 Leds, or was it 200. It was suddenly not an easy project, with surface mount components and all! And that was only the...
  2. S

    Equalizer ...

    Hi Mukhalled Are you joking :)? //Staigen
  3. S

    BENCH POWER SUPPLY

    Hi there again Um...Me123, sorry i didn't had time to reply your questions until now :( No, as Audioguru say, the transformer itself output AC, it is then rectified in the rectifier bridge and smoothed with the 2200 microfarad electrolytic condenser! The output from this PSU is DC. The AC from...
  4. S

    BENCH POWER SUPPLY

    Hi Um...Me123 Yes, sure you can, its only the secondary that have to be 28 Volts! Wich supply are you talking about, the supply with the L200 dont have a 28V transformer, if i remember right?
  5. S

    What chip is this?

    Hi there Kensoft, velcome to the forum :) I belive the chips are 4164 dynamic ram memorys, if i remember right it is 64 Kbit chips, but i'm not shure, they are rather old today :(! //Staigen
  6. S

    Dual CMOS based timer problems...

    Hi again Disconnect the wires temporarily and connect a trimpot for testing, to see if this cure the problem, or at least make a change. If it work then, use screened wires, and see if that will work! //Staigen
  7. S

    Dual CMOS based timer problems...

    Hi there again Kain Is the IC properly bypassed? With a ceramic 0.1 uF condenser as near as possible to the IC.This is surely a strange behaviour! //Staigen
  8. S

    BENCH POWER SUPPLY

    Hi there Um...Me123, welcome to this board :) You shold consider buying a digital VOM( or what the name for it is), a Volt/current/ohm-meter too The LM317 Power Suply in the Projects section of this site is a good start for a PSU for a beginner! :) A link is here...
  9. S

    Dual CMOS based timer problems...

    Yes, in similar constructions i have seen, the rectifier is only halfwave, with only two diodes, the anode of one diode connected to the common negative and the catode of the other diode connected to the powersupply's positive terminal! //Staigen
  10. S

    Dual CMOS based timer problems...

    Hi there again Kain :) I'm not shure what happens, when you connect the thyristor the way you did, but it's not correct, thats for sure! BTW, isn't the resistors in the gates( R18 and R19) a little bit large(100K), maybe you should try smaller ones here(10K or so). I know the thyristors are...
  11. S

    UTP cable: diameter? Imax?

    Hi there
  12. S

    Dual CMOS based timer problems...

    Hi there Kain :) So you dont see the error in the shematic? The thyristors Q1 and Q2 are connected to AC1, but the "ground"(the negative connection of C2) of IC1 is not! The gates of Q1 and Q2 shall have their steering pulses related to their catodes! The output of IC1 is related to the...
  13. S

    Watts , amps?

  14. S

    ElCheapo PSU

    Hello, im back! Well, Audioguru explained it wery good! Thanks Adioguru, then i dont have to write so much, i'm not so good in the english language! //Staigen
  15. S

    ElCheapo PSU

    Hi there again Autir :) Oops, this was much, shall we take the fuses first. The transformer is rated at 9.6 VA at the output, but the efficiency is only about 75 to 80 %, so the current is going to be at least 55 mA on the input, but with a fuse that are rated at 55 mA it surely is going to...
  16. S

    Dual CMOS based timer problems...

    Hi there Kain Shame of you, sending up a shematic with such a serious error in it, and asking us to analyze it, and why it is not working as expected :( :)! Shame shame shame Back to the CAD software!
  17. S

    Work

    Hehe, i am a pensioneer
  18. S

    ElCheapo PSU

    Hi there Autir Well, i dont belive she is a beauty, but if it is your first circuit it will do :) But you will have to do a few changes first >:(! But first to the questions about fuses. First fuse should be in the mains section of the transformer, its a 9.6 VA rated one, about 80 or 100...
  19. S

    Dual CMOS based timer problems...

    Hi there Kain This will surely not work, take a close look at the PSU:s rectifier! The output to the Zenerdiode is taken from the input to the rectifier bridge and the input to the bridge is connected to its output. Also, small, lowpower PSU:s for things like this usally not have rectifier...
  20. S

    My solderstation failed

    Hi Ante, i had Grisoft AVG, but it did not react! I also had an old version of Norton antivirus, not updated in several years! Does anybody have a copy of "Lost and found" maybee? //Staigen
Top