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  1. Arouse1973

    Flickering light (LED) circuit

    Well I don't know a work around. All I will say that if you use a dimmer that is not suitable for the LEDs then you don't have any comeback if one fails. So it's up to you what you do, you may be able to find a box of tricks that makes them compatible but I have not looked for one. You could try...
  2. Arouse1973

    Flickering light (LED) circuit

    So it's only two light banks then? have you looked into the prices of the dimmers are they that exspensive? Adam
  3. Arouse1973

    Flickering light (LED) circuit

    How many dimmer switches do you have? Adam
  4. Arouse1973

    Flickering light (LED) circuit

    But the dimmer switch needs to be the right one also Adam
  5. Arouse1973

    Flickering light (LED) circuit

    Some of the issues that may occur when a dimmer is incompatible with an LED lamp are: Flickering - Lamps will flicker (can also occur if a non-dimmable lamp is used) Drop-out - No light output at the end of the scale Dead travel - When the dimmer is adjusted there is no matching change in light...
  6. Arouse1973

    Flickering light (LED) circuit

    Ah you can't dim all LEDs, they need to be dimmable types. Are they? Adam
  7. Arouse1973

    Flickering light (LED) circuit

    Looks like both are flickering? Adam
  8. Arouse1973

    Flickering light (LED) circuit

    That's very odd. Not sure then. Their not on a dimmer by any chance? Adam
  9. Arouse1973

    making a big magnetic field

    No sorry, I don't know enough to help :) Adam
  10. Arouse1973

    making a big magnetic field

    This is way above me, one thought I have had is you could cover you robot in Lead. Lead is a superconductor so the magnetic filed can't go through it. Adam
  11. Arouse1973

    Flickering light (LED) circuit

    It must be a loading issue then. If the voltage is dropping by a small amount this may not be noticed so much by the 6 LEDs as compared to the 2 LEDs. Can you disconnect some of the 6 LEDs and see if that helps? Adam
  12. Arouse1973

    making a big magnetic field

    Magnetic fields can certainly pass through metals. I can't help you any further sorry. Adam
  13. Arouse1973

    making a big magnetic field

    At 10 meters, not a chance. This would require a huge amount of energy, the components needed to do this would probably be heavier than your robot. And how would you protect your robot only being a few centimetres away? Adam
  14. Arouse1973

    Flickering light (LED) circuit

    What colour are your LEDs? Try switching both on and covering up the 6 LEDs with your hand, does this help? Adam
  15. Arouse1973

    Sensorless BLDC motor driven synchronously.....hrmmm...

    Ok let ignore the start up condition for now. I think most of the designs using BEMF feedback use an alignment phase first and then ramp up to full speed then the BEMF kicks in. But you are not using any feedback at all. I guess we need to ask ourselves why is feedback used and what are the down...
  16. Arouse1973

    2 pole low frequency shelving filter design

    Where has your 2K2 resistor gone? Adam
  17. Arouse1973

    2 pole low frequency shelving filter design

    Ok LP filter is ok. I thought you might have wanted a band of bass frequencies boosted and not just from 0Hz to 300Hz. I would probably use a MFB filter for this circuit. Adam
  18. Arouse1973

    Sensorless BLDC motor driven synchronously.....hrmmm...

    This is getting interesting now. Have you tried to load the output shaft? without feedback would you expect to see torque ripple under load, e.g. how do you slow down your control when the motor is loaded, because wouldn't it become a bit jittery? Adam
  19. Arouse1973

    2 pole low frequency shelving filter design

    That looks better. Have you considered a bandpass filter? You could the choose a range of bass frequecies that would be amplified. Have you chosen a frequency and gain you want? Adam
  20. Arouse1973

    Sensorless BLDC motor driven synchronously.....hrmmm...

    Ok I thought you were using the stepping mode by just switching the coil with one polarity. So your not even using BEMF then. Out of interest how are you driving the motor coils, how do you ensure the coil moves the rotor magnet at the right time. I would love to see a circuit diagram. Adam
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