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  1. CDRIVE

    Convert V to mV

    Is that the one where Godzilla's big foot crushes Bambi? Huh? What does that mean? Chris
  2. CDRIVE

    The Ultimate Tube RIAA-Amplifier?

    No where in that artical did I read "bias", "self bias" or any other kind of bias. The artical doesn't even mention a grid and seems to be focused on VC diode characteristics. Did I miss something? Chris
  3. CDRIVE

    Convert V to mV

    If the first guy to use ASCII art is still alive I'd like to whack him with a bat. If he's dead and gone I'd like to dig him up and whack him with a bat anyway! :p Chris
  4. CDRIVE

    BT150 Thyristor equivalent(BT151) has just exploded !!!

    Google is your friend. http://www.youtube.com/watch?feature=player_detailpage&v=v58KiktJLyE Chris
  5. CDRIVE

    BT150 Thyristor equivalent(BT151) has just exploded !!!

    I think you don't quite grasp how a Thyristor works. It does not vary the level of the output voltage. Chris
  6. CDRIVE

    Hole in a transistor

    Sorry but that doesn't help. Chris
  7. CDRIVE

    BT150 Thyristor equivalent(BT151) has just exploded !!!

    I've never heard an armature called a collector. Is that a Euro term? Chris
  8. CDRIVE

    Hole in a transistor

    It's more than probable that something else failed which caused Q1 to pop like that. Do you know if the printer was hit by a mains spike? Posting clear photos of both sides of the board may help. Chris
  9. CDRIVE

    The Ultimate Tube RIAA-Amplifier?

    I don't believe that to be true. I know of only three modes of VC bias, Cathode resistor, Grid Leak Bias and external source bias. Grid leake bias derives the bias from the grid input signal. Chris
  10. CDRIVE

    The Ultimate Tube RIAA-Amplifier?

    Not on its own. This is grid leak bias so C1 is required as well as signal. IE, there's no (-) grid bias present without signal input. That much I haven't forgotten. :p Chris
  11. CDRIVE

    Another circuit to analyse (MALAXOR speed variator)

    Glad to hear that but mark you're schematic as "Error On Print!" so in the future you remember that. ;) Chris
  12. CDRIVE

    Adapting old Apple RJ11 keyboard to USB

    Here's a Mac Plus keboard discussion. Take note of the sixth post. http://www.vintage-computer.com/vcforum/archive/index.php/t-9936.html Chris
  13. CDRIVE

    Adapting old Apple RJ11 keyboard to USB

    Here's a thought. Why not plug it into the Mac's keyboard port. :rolleyes: This video seems to indicate that the Mac Plus has a keyboard port (RJ11) on the front of the computer. http://www.youtube.com/watch?feature=player_detailpage&v=jGqcUuHOjJI Chris
  14. CDRIVE

    delay off timer for bathroom fan

    Personally I think an attempt to repair the original circuit should be made. Chris
  15. CDRIVE

    The Ultimate Tube RIAA-Amplifier?

    I'm working on a backup PC since my laptop crashed, so I don't know if my Tina includes the ECC83. I would guess that it would have properties similar to the 12AX7, 12AU7, 12AT7. Chris
  16. CDRIVE

    delay off timer for bathroom fan

    You must have drawn something when you attempted this...... Chris
  17. CDRIVE

    delay off timer for bathroom fan

    Welcome to EP Yossi. Please post your schematic. Chris
  18. CDRIVE

    The Ultimate Tube RIAA-Amplifier?

    After examining the print further I have more questions. There's no Cathode resistors. How are the tubes getting grid bias? I don't see a heater supply for them either. Admittedly I'm not familiar with European or UK tube models. Chris
  19. CDRIVE

    The Ultimate Tube RIAA-Amplifier?

    I'm a bit confused. I can appreciate a love affair with vacuum tubes (valves) but it's usually from input to output. Why the BJT? Why not a Cathode Follower? Vacuum tube environments don't marry well with solid state either. Manufacturers learned this the hard way back in the sixties. That...
  20. CDRIVE

    Using 24VAC thermostat with UK 240v boiler

    I don't disagree with what Harald told you but I'd like to add that the link you provided states that the transformer is designed for 60Hz. I believe you're mains are 50Hz. Chris
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