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  1. CDRIVE

    IGBT help needed

    Sorry for waiting so long to respond. I was hoping that another member with hands on familiarity of IGBJTs would chime in by now. Unfortunately the part numbers you posted are not OEM numbers. At this point there's no way to find the manufacturer's DataSheet for it. We may be able to provide...
  2. CDRIVE

    Help getting my circuit to work - sound card osciloscope calibrator

    Keep butting that Dam Robert! ;) Chris
  3. CDRIVE

    Problem with picaxe 14m2

    This was extracted from the Picaxe Getting Started PDF and I completely forgot about this issue! Make sure your jumper is in the Programming position. If it isn't I would expect you'd get the error message you're reporting. ;) Chris
  4. CDRIVE

    Problem with picaxe 14m2

    I haven't replied to my topic on the Picaxe forum either. Partly because I don't fully agree with the answers provided by (Hippy) Technical. I simply don't buy that the Picaxe software can't differenciate between a virtual port and a real one! The software most likely gets its port data by...
  5. CDRIVE

    looking for a "center-bore" motor

    Ah, I forgot about them. Too bad the bore is much smaller than he needs. After all they're quiet and efficient. Chris
  6. CDRIVE

    Modernise old rotary telephone

    FYI, I just stumbled upon youtube vids regarding this topic. Evidently there are commercially made inexpensive modules that convert the pulse dialer to DTMF. Chris
  7. CDRIVE

    Akai MPK49 repair

    Actually, I'm much steadier in that state than after the gallon of morning coffee I drink. Though, I do stay out of my wood / metal shop in that state. ;) Chris
  8. CDRIVE

    Help getting my circuit to work - sound card osciloscope calibrator

    Steve, speaking for myself I hope you didn't get the impression that I was trying to stifle Robert's enthusiasm. Definitely to the contrary. Possibly if links to your designs had been posted we would have been more enlightened regarding how they were to be used. We didn't see the astable FF...
  9. CDRIVE

    Help getting my circuit to work - sound card osciloscope calibrator

    Robert, that is something that is arguably undisputed. Glad you got it working! ;) Chris
  10. CDRIVE

    frequency range too small on 555 timer circuit?

    Alec, I like it. It's a clever simple circuit but it's giving me a case of deja vu. Have you ever posted that circuit elsewhere? Chris
  11. CDRIVE

    looking for a "center-bore" motor

    A "small' motor with a 4cm hollow spindle? Seems like an oxymoron. o_O There are some wood turning lathes that employ this type of motor (hollow spindle) but not with a 4cm bore. Those motors aren't small either. The motor is the headstock itself with an MT2 or MT3 taper on the inboard end...
  12. CDRIVE

    Help getting my circuit to work - sound card osciloscope calibrator

    Adam, is the first schematic supposed to be the power supply for this AFF? Chris
  13. CDRIVE

    Help getting my circuit to work - sound card osciloscope calibrator

    As stated repeatedly here your Sound Card Scope is strictly an AC instrument. Whatever that circuit is supposed to be (it has errors) it's going to have a DC output that can't be seen or measured by your scope. Chris
  14. CDRIVE

    Driving both N and P mosfet with same power supply

    Well your schematic is more akin to a PCB layout. It's absolutely painful on old eyes. That said and unless my eyes have totally failed me, I don't see how any of that will work properly. For starters you have the LEDs and the current limiting resistors wired in parallel with the Drain-Source...
  15. CDRIVE

    Driving both N and P mosfet with same power supply

    Hello and welcome to EP. We speak the schematic language here, so it's best to post schematics of what you want to do. PCH FETs can be inverted similar to the way we use PNPs with a positive rail supply. When the Gate is brought to GND it will be gated on. Chris
  16. CDRIVE

    1V audio burst every OTHER pushbutton

    You did just fine. In fact you went above and beyond the norm. Many of us will spend time spicing a circuit for a member, including me .. but I've never gone into my shop and done metal work for anyone. Chris
  17. CDRIVE

    Flyback driver for Jacob's Ladder?

    Ha! Ya haven't lived until you've purchased a Chinese (direct) item off ebay and contacted the seller for additional information or to clarify a spec. While they're the lowest price (CLONE) experts of the world their international communications skills are nearly non existent. Chris
  18. CDRIVE

    input-output equations for Transistor circuit

    Perhaps language gaposis? :D Regardless of that, this sounds like homework. It probably doesn't belong in the Circuit Help section. Chris
  19. CDRIVE

    1V audio burst every OTHER pushbutton

    I'm anxious to read the answer to this. Chris
  20. CDRIVE

    Akai MPK49 repair

    Those are (SMD) surface mount components. Pray that the guy has good eyes and a steady hand. Not everyone has the soldering skills needed with SMD. Chris
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