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  1. Alec_t

    Flyback joule

    Welcome to EP! Post your schematic, plus details of the bulbs and power supply, and perhaps we can help.
  2. Alec_t

    Help a blind man in electricity

    Anti-clockwise actually (unless you have one of those joke clocks :)).
  3. Alec_t

    Waveform simulation in LTspice

    Welcome to EP! Does i/v mean 1) i divided by v 2) i OR v ? Is the rounded top to the waveform essential, or would a conventional RC charge/discharge waveform do? Edit: The nearest I could get to the first waveform was by setting the source properties as EXP(0 1 0 40u 40u 80u)
  4. Alec_t

    Schmitt Trigger

    Welcome to EP! What is the flowmeter output spec? Volts? Open-collector? .....?
  5. Alec_t

    High school project - Using LIS331 to monitor tremors

    Your measurement means that a reading of 6000 corresponds to 1g. That is your "gain" figure. So an acceleration of 0.1g, for example, should give you a reading of 0.1 x gain = 600.
  6. Alec_t

    CD Tray Won't Open

    Welcome to EP! If the rest of the system is working ok then my guess would be that a common power supply to all the tray motors is missing/weak. Any chance you can post a schematic?
  7. Alec_t

    Signal extender for diesel engine.

    Only if you can add more oxygen too, to convert that fuel to combustion gases.
  8. Alec_t

    PWM circuit with a mind of its own...

    But if you don't blow the air then the heatsink will get even hotter than normal. I would have thought the fridge doesn't care what the room temperature is; it's the absolute temperature of the heatsink which matters.
  9. Alec_t

    Signal extender for diesel engine.

    Pumping more fuel in won't necessarily give the engine more oomph (if that is your intention), since it would upset the air/fuel ratio. Such a modification may be damaging, as Gryd3 says, may be illegal if it defeats emission controls, and may invalidate your insurance.
  10. Alec_t

    PWM circuit with a mind of its own...

    Did you see this part of the 648 datasheet?
  11. Alec_t

    PWM circuit with a mind of its own...

    Welcome to EP! Two points: 1) Is your FET a logic-level type? 2) There is no back-emf protection diode across the fan.
  12. Alec_t

    Negative Spike Voltage

    If your ADC has multiple inputs you will need a respective clamp circuit for each one.
  13. Alec_t

    9-phase generator without a microcontroller (it works, but phases aren't where I expected)

    Oops. "Input" should have read "ring".
  14. Alec_t

    9-phase generator without a microcontroller (it works, but phases aren't where I expected)

    Not sure what you mean by the "total frequency", but each stage introduces a phase shift of 180 + 180/9 = 200 degrees (neglecting propagation delays within the inverters). That is not 1/9 of the period of either input frequency.
  15. Alec_t

    design electromagnetic coil of sheet fanner ?

    I think you'll just have to experiment.
  16. Alec_t

    design electromagnetic coil of sheet fanner ?

    The patent says you can use permanent magnets or electromagnets. I can't. Can you? You haven't even told us the properties (size, weight etc) of the sheets!
  17. Alec_t

    Programmable timer / usb pump

    Your lithium battery will require a control circuit for charging/discharging it safely, to prevent the battery catching fire or exploding.
  18. Alec_t

    Help me draw this circuit's diagram

    Looks like a ceramic cap to me. Both caps are unlikely to be polarised.
  19. Alec_t

    Need help with long distance circuit

    Between which pins? Is any of pins 1,2,3 common with the ground rail of your 24VDC module?
  20. Alec_t

    design electromagnetic coil of sheet fanner ?

    Welcome to EP! I'm struggling to understand the principle of operation. Can you explain it? Presumably the sheets are ferromagnetic. In which case, what prevents them all sticking together when a magnetic field is created near them? The coils needed would obviously depend on the size and weight...
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