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  1. CDRIVE

    Help Me/ hook up a forward-stop-reverse motor cont switch on a 220volt mill machine

    Please rephrase this statement as I'm not sure what you're saying. I will tell you what I know to be true about Split Phase Capacitor Start/Capacitor Run Induction motors. I have a 1954 Logan 920 Lathe and a 1966 South Bend Heavy 10. (1) The Start winding along with its series connected start...
  2. CDRIVE

    H-bridge with TIP 122/127

    Wingnut, There are two basic categories of transistor usage. One is as an amplifier, where the output current is an amplified image of the input (Base-Emitter) current. In this mode (Linear) the transistor is never completely turned on or off. The other use category is called "Switching". In...
  3. CDRIVE

    configuring hardware key with pc

    I don't like the idea of hard wiring directly into the keyboard "Enter" key circuit. Does your mouse have to be over the "Next" button to click it or can it be anywhere in that window?
  4. CDRIVE

    555 timer reverse polarity circuit

    After giving this a bit more thought I've updated the schematic (LEDs included) but kept the SPDT relay. I really didn't like using an extra set of relay contacts just to light some LEDs, so this version drives the LEDs from the 555's Output pin. This doesn't mean that you're committed to a SPDT...
  5. CDRIVE

    Help with Under Water Sony Remote?

    I've used 'Big Bath' for years when I had a marine electronics shop. Spray it on, scrub with old tooth brush, spray rinse off. Good stuff! http://www.warrenelectronics.com/Chemicals/Chemicals.htm In a pinch and if I had nothing else I've used mineral spirits with no ill effects. It's never...
  6. CDRIVE

    555 timer reverse polarity circuit

    I came back here to delete a nasty post that I made but it seems the Mods already did that for me. Thank you! Chris
  7. CDRIVE

    transistor circuit for counting wheel rotations

    These are the most impressive specs I've seen on a LLFET to date. Excellent find! ;) PS: My apologies for my nastiness the other day. 'Grumpy Old Men' are not just a fictitious demographic. We do exist! :p
  8. CDRIVE

    transistor circuit for counting wheel rotations

    While not a solution for you I couldn't help but post this McGuiver-esc bounceless switch. I imagine he would have made this with his pocket knife and used it to disarm a thermonuclear device that would detonate with anything more than one switch closure within a few mS. :D...
  9. CDRIVE

    configuring hardware key with pc

    If the 'Next' button is the only active control that Windows sees then it will have the focus. As Harold said the 'Enter' key will then be active. The 'Space Bar' key should also work and is much bigger and more convenient.
  10. CDRIVE

    Question about an FM Transmitter

    That's odd. To paraphrase Steve; If the transmitter & receiver are in close proximity you shouldn't need an antenna at all. I wouldn't think the receiver wouldn't need one either.
  11. CDRIVE

    potentiometer replacement

    Have you considered using a small PIC? Picaxe is easy to program and does not require a programmer board.
  12. CDRIVE

    Question about an FM Transmitter

    Is this a kit? Do you have a Voltmeter?
  13. CDRIVE

    smoothing the output from a battery charger

    Or is it wired like this?
  14. CDRIVE

    smoothing the output from a battery charger

    I'm surprised that you describe a "buzz". I would expect it would be 100Hz hum and 120Hz hum on this side of the pond. Since a large wet cell will usually smooth out LF ripple as well as many capacitors I wonder if something else is going on here. Is the charger circuit a dedicated line or...
  15. CDRIVE

    simple question

    How big might that be? Perhaps the size of a 50gal drum? Baybe bigger?..1960's vintage Buick? :D
  16. CDRIVE

    What value of resistors do I need and a sanity check

    I had no idea there was so many people wanting to play Electrotherapist.
  17. CDRIVE

    555 timer reverse polarity circuit

    It would have been helpful to know this before I drew the schematic. Replace K1 with a DPDT relay and wire the LEDs like this.
  18. CDRIVE

    Chronograph for bullets

    It's hard to conceptualize a mechanical (infinitely reusable) target. This issue always brings me back to a photoelectric solution.
  19. CDRIVE

    potentiometer replacement

    A digital pot comes to mind but I don't think it will fill all the requirements you listed, including the off switch. You also need to provide more information like, is any of those three uC pins committed to GND or Vdd?
  20. CDRIVE

    Transistor to switch power supply

    If you're counting votes I second Steve's Schottky Diodes approach. It's a simpler solution than messing with a PNP.
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