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  1. Hero999

    About file uploading

    I agree. It's a downgrade, rather than an upgrade. The old software was much better.
  2. Hero999

    What's happened to all the posts since 24 February?

    Sorry the problem with the quote button was at my end. I had scripts on electronics lab disabled. I've enabled scripts and can now see the quote button. Still no attachments and there's no preview button either.
  3. Hero999

    What's happened to all the posts since 24 February?

    "The forum was dead before the upgrade." It wasn't as dead as it is now. On average there was about 10 to 20 posts per week until you killed it. http://www.electronics-lab.com/forum_old/index.php?action=recent;start=0 "I hope with the upgrade will motivate more users to participate." So far...
  4. Hero999

    What's happened to all the posts since 24 February?

    I also can't find a way to post an attachment. Please go back to the old software.
  5. Hero999

    What's happened to all the posts since 24 February?

    Those buttons aren't visible from my account. You may be able to see them but I can't.
  6. Hero999

    What's happened to all the posts since 24 February?

    I hope more people will post. I can't see the quote button; where is it?
  7. Hero999

    0-30 Vdc Stabilized Power Supply

    It's not too critical, as long as the op-amp can tolerate 44V but unfortunately not many modern op-amps can. You could use the OP27 but you'll need to modify it because the offset trim configuration is different. http://www.analog.com/media/en/technical-documentation/data-sheets/OP27.pdf...
  8. Hero999

    What's happened to all the posts since 24 February?

    There have been no posts now for over a week, apart from this thread. The forum has died, since the upgrade. The new software may be more secure but it's no good if half of the old forum content is gone, along with the members. The new software, also seems to be less easy to use and lacks...
  9. Hero999

    What's happened to all the posts since 24 February?

    Thanks. I suggest you wait and see how many people are using the new forum (so far it's just you and me!) before deleting the old one and switching to the new one.
  10. Hero999

    What's happened to all the posts since 24 February?

    Can't you just go back to the old forum software? What was wrong with it?
  11. Hero999

    What's happened to all the posts since 24 February?

    Since the forum upgrade, all posts made since 24 February have vanished. What went wrong?
  12. Hero999

    SCR Rectifier Dayton Speed Control Need cross reference No one can find

    Yes K, A G does normally mean SCR. But the socket seems to indicate it uses the whole waveform and there are only two diodes, rather than the four expected in a full wave rectifier. You really should try to draw the schematic, even if you're not sure of the components. Just draw the TRIAC/SCR...
  13. Hero999

    Capacitor charging using low voltage supply

    It works, congratulations!
  14. Hero999

    SCR Rectifier Dayton Speed Control Need cross reference No one can find

    Are you sure it isn't a TRIAC? Have you traced the whole schematic and drawn it?
  15. Hero999

    SCR Rectifier Dayton Speed Control Need cross reference No one can find

    Sorry I meant SCR not TRIAC. It's difficult to know without a schematic. How is this implemented? Is it a universal motor run off rectified mains?
  16. Hero999

    Capacitor charging using low voltage supply

    1) That doesn't sound right but some regulators do need a minimum load current to regulate properly. What does it say on the datasheet? 2) What resistor value are you using? That sounds like the expected short circuit current. Is the meter in series with the resistor or just connected across...
  17. Hero999

    SCR Rectifier Dayton Speed Control Need cross reference No one can find

    Are you sure it isn't just the TRIAC? Perhaps the motor has failed?
  18. Hero999

    Solid State Relay crydom td2425 uses

    It can't work as a lamp dimmer because it's zero crossing. For a lamp dimmer you need a TRIAC which can be triggered in the middle of a cycle. This solid state relay can only be triggered at the start of the AC cycle when the voltage across the TRIAC is near zero. It will then remain on until...
  19. Hero999

    Solid State Relay crydom td2425 uses

    It's a solid state relay with a DC input and TRIAC output. A solid state relay does not convert the voltage. It enables a low current signal to switch a higher current on and off. This type of relay has a TRIAC output. It will only turn off when the current flowing through the output falls to...
  20. Hero999

    Capacitor charging using low voltage supply

    It seems like your circuit is working. The current drawn from the capacitor by the switched mode should increase as the voltage drops. This is because the regulator tries to keep its output voltage irrespective of the input.
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