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  1. CDRIVE

    Simple bike generator - help!

    A 500lb flywheel might be a good idea. Then find a guy they call Godzilla. Chris
  2. CDRIVE

    diode for collapsing magnetic field

    Here are some other uses for it. Marking, center punching, drilling metal. Especially round stock and even more so when drilling horizontally with a hand drill motor. That thin layer of tape increases the effectiveness of the center punch measurably. Reducing tear-out when sawing with a...
  3. CDRIVE

    LED to light when battery drops below 3.5V

    The trip point for the MCP101-270 is 2.625V 'typical'. This series of chips were not designed for use with a voltage divider. Chris
  4. CDRIVE

    LED to light when battery drops below 3.5V

    Only once did I manually add a spice model directly to the library. Nothing about it is intuitive and I've bItched to Tina about it. It was so damn confusing that I don't remember how I did it. They need a good wizard. Because it's so much easier, I just make a spice macro. The macro wizard is...
  5. CDRIVE

    LED to light when battery drops below 3.5V

    I don't know if you're referring to simulating this or a real world circuit. I mention this because you said that you simulated one or both of my circuits and you had to change resistor values to duplicate my results. This shouldn't be at all. Unlike the real world all the component values...
  6. CDRIVE

    LED strobe circuit needs more current

    This is post 81 in a thread that should have been wrapped up by maybe 10. Their reaches a point were some threads become irritating. For me, this one has reached that point. My first clue that we'd get where we are is when you weren't interested in using a chip because of the component...
  7. CDRIVE

    LED strobe circuit needs more current

    That's why I set up the 555 for a brief pulse. That's what strobe effect is. R4 controls the pulse width. You can easily make it shorter or longer. Chris
  8. CDRIVE

    diode for collapsing magnetic field

    Yeh, I always looked forward to that segment of SNL Hey, I see you use the same marking system as I do. It must be something about that blue painter's tape. Chris
  9. CDRIVE

    LED to light when battery drops below 3.5V

    Justin, do you know how to set Tina up for a DC Transfer Characteristic? Also, you'll note that the plot is measuring LED current yet there's no ammeter or current arrow in my circuits. That's because the LED current limiting resistor (R2) is a macro I created. It's actually a 220Ω resistor with...
  10. CDRIVE

    diode for collapsing magnetic field

    I think that we all, at one time or another, go through a period that we'd swear that our machines and technology are at war with us. :D Rosana Rosana Danna said it best... "It's always someth'n!" Chris
  11. CDRIVE

    diode for collapsing magnetic field

    Yes, I imagine the LEDs worked and the blinking pump LED was flashing. Glad you found the bad motor ground. Now it's a matter of wait and see. Good luck, Chris
  12. CDRIVE

    LED to light when battery drops below 3.5V

    Here's a BJT version with hysteresis. The LED fires when the battery voltage drops <= 3.5V. It will remain on until the battery is recharged to 3.88V. This circuit won't flicker. I don't believe either one of the circuits I gave you will be superior to the MAX chip though. I posted them for...
  13. CDRIVE

    LED to light when battery drops below 3.5V

    If you want to play with simulating a battery low indicator create this. It has no temperature compensation but it will give you the basic idea. There's no doubt that the chip you ordered will have far more temperature stability. I'm going out to get some sunshine but I'll post a BJT version...
  14. CDRIVE

    input 4 bit analog to USB output?

    Happy to help. My wife says I like to hear myself. I guess EP is an extension of that. Chris
  15. CDRIVE

    LED to light when battery drops below 3.5V

    Good tip but I was referring to his Tina circuit, which is unrelated to this topic. I think he's just playing with Tina and components to aid in his understanding of transistor action and Tina too. Chris
  16. CDRIVE

    1N400x Diode Heat Sink

    I liked it so much that I posted the link on one of my machinist groups. As we know shop and electronics often marry. By the way, I was surprised that the super glue adhered to the nylon tie wrap but I guess it did. ;) Chris
  17. CDRIVE

    input 4 bit analog to USB output?

    To expand on what CC said, digital is a very broad term. What a logic 0 and Logic 1 are is dependent on the logic family. Regardless of the logic family they will all have one thing in common, n1 voltage is considered a logic 0 while n2 voltage is considered a logic 1. A Serial port (RS232) is...
  18. CDRIVE

    LED to light when battery drops below 3.5V

    Justin, you need a 1K resistor in series from VG1 to T1's Base. In the real world, without it, the base-emitter junction would be destroyed el pronto! You also have to move VF1 to the Collector. You're measuring ground where it is now. Chris Edit: I would also set the DC property of VG1...
  19. CDRIVE

    diode for collapsing magnetic field

    Measure the voltage from ground to the pump + with the relay activated. If it doesn't measure 12V then measure from ground to node #86, which is the input contact of the relay. If it measures 12V then the relay contacts or the internal wires to the contacts are toast. If those measurements test...
  20. CDRIVE

    Is Differential Amplifier badly inaccurate?

    It should be breadboarded first. Chris
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