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  1. CDRIVE

    Variable current limited Power Supply

    You can add this to your circuit.
  2. CDRIVE

    variable motor speed with override

    Welcome to EP. We don't dislike first posts being questions. We're not a social forum. We're here to help. We do prefer image attachments though as we don't like opening attachments. Can you do that for us? Thanks, Chris
  3. CDRIVE

    Photointerrupter latching encoder?

    What value is the pot set at? 100K is way too high. In fact I don't see a need for it. Chris
  4. CDRIVE

    Why I want my old world back!

    The vast majority of environmentalists have never set foot in the wild! Chris
  5. CDRIVE

    turn off circuit at low voltage

    Ha, that's because you understand the circuit. The more I deal with nubes and students the more I hang on every word I type. I do a lot of editing but it's still no guarantee that it won't be misconstrued! :D Chris
  6. CDRIVE

    Photointerrupter latching encoder?

    I don't see any issues with your schematic. This might be just an issue of speed. How fast does this have to be? We may be able to cure this with some RC delay on the 555's Tggr-Thld input. Or you might be unknowingly passing light. Chris
  7. CDRIVE

    Why I want my old world back!

    That's because it's not! :mad: Chris
  8. CDRIVE

    Low voltage sine wave output

    The reason you're having trouble with naming them U1A & U1B is because you're using a generic OpAmp, not the TLE2142. The TLE2142 is found on the Spice Macro tab - Operational Amplifiers - TLE2142. This is important not only for how Tina displays the component names, pinouts and such but it's...
  9. CDRIVE

    Variable current limited Power Supply

    Sure Duke, the foldback can be brought down to what one considers "toward zero, the uA region and maybe even nAmps " but absolute zero is not logically possible. That would require a resetable trip circuit. Chris
  10. CDRIVE

    turn off circuit at low voltage

    Harald, just a thought... Shouldn't that read "If you use a monitor with open open collector / drain output, R2 should be replaced with a jumper"? jayusa123 seems like a bright fellow but a nube stumbling into this thread could interpret "omitted' as no connection. Chris
  11. CDRIVE

    Photointerrupter latching encoder?

    I don't see why the 4017 would do that. Post your schematic. I want to see how you're using the 555. They make a good schmitt trigger but you may have something wired wrong. Chris
  12. CDRIVE

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

    That does not look like an induction motor of any sort. My bet would be it's a Universal motor. Universal motors employ brushes, field windings and armature windings. They work equally well on AC or DC, hence the name. They are high torque in a small package. After seeing the motor photo...
  13. CDRIVE

    Why I want my old world back!

    I just saw a commercial but as usual, though I remember the irritating details, I have no idea what they were advertising. Here's the scene... We have a young boy Trout fishing with Grandpa and Dad on the banks of beautiful cold water creek. In the old days the last scene would be the happy...
  14. CDRIVE

    Iron vs Copper

    Are you implying that you can block a magnetic field with a copper barrier or block a changing magnetic field. Either way this topic is would be better placed in Electronics Chat. Chris
  15. CDRIVE

    turn off circuit at low voltage

    Since we're going to be modifying your existing circuit I think you should post it. Chris
  16. CDRIVE

    Variable current limited Power Supply

    Hey, I just noticed something in that circuit that I don't think is good practice and could pop Q2. When the wiper of R2 is at 12 o-clock there is no resistance in the circuit to limit Q2 base current! :eek: Chris
  17. CDRIVE

    Variable current limited Power Supply

    Absolute zero current from a current limited supply makes little sense. If you follow the logic that Duke gave you then follow me a little further. In order for Q2 to turn on there must be between .6V to .7V developed across R1. In order for that to happen current must be flowing though it to...
  18. CDRIVE

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

    That circuit employs a Triac and even Triac control finds limited use as I've described. What are the motors driving? Chris
  19. CDRIVE

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

    An SCR + 220VAC Induction Motor does not compute. Chris
  20. CDRIVE

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

    TWIMC, There are very few induction motor applications that lend themselves to satisfactory Thyristor slope trigger control. Ceiling fans are in this small category because their load is next to zip... Not much else. Chris
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