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  1. Arouse1973

    Resistance Measurement Circuit Help

    Here is a little circuit for you. VS3 is the input voltage across the resistor. It gives you an output of approx. 1 V - 10 V for an input of 10 mV to 1 . You need to use a rail to rail opamp for this, Linear Tech are one such supplier. Output on this opamp in from pin 6. Adam
  2. Arouse1973

    Resistance Measurement Circuit Help

    No probs
  3. Arouse1973

    Resistance Measurement Circuit Help

    Hello, page 18 middle circuit is an example. http://cds.linear.com/docs/en/datasheet/3085fb.pdf Adam
  4. Arouse1973

    Electronic noob wants to make underwater LED lights

    Hello I guess you realise this will be 10A of current combined can the electrics handle this? At this sort of current you will be wasting quite a bit of combined power in the resistors. You would be better off using a dedicated LED driver so the brightness is maintained even when the engine is...
  5. Arouse1973

    Resistance Measurement Circuit Help

    Hello The reason you are probably having trouble is the head room voltage on the input. You will have to change the value of the current set resistor to allow you to measure at both ranges. Example: if you had a current of 10 mA this would produce 1V across 100 R but would try and drop 1000...
  6. Arouse1973

    Induction cooker pans?

    I think it's going to be the other way around. Copper won't be as good as steel because of the skin depth. To allow copper to heat to the same degree the frequency would have to increase. I guess that's what they are doing for stoves that heat copper and aluminium pans. Adam
  7. Arouse1973

    Power banks in parallel to increase A / mAh

    Good Luck :)
  8. Arouse1973

    Induction cooker pans?

    I think you need adaptor plates for non-magnetic pans so they just act as a normall hob. Adam
  9. Arouse1973

    low rpm gearmotor and controller.

    I would if you had mentioned that in your first thread. I will wait for the link. Adam
  10. Arouse1973

    Induction cooker pans?

    I think the material needs to be feromagnetic as its the eddy currents which create the heat. Adam
  11. Arouse1973

    low rpm gearmotor and controller.

    Hello Care to give us a link to them then?
  12. Arouse1973

    Power banks in parallel to increase A / mAh

    Yes I agree with this as far as if the voltage in is twice the voltage out and stays there. But when the voltage falls with a battery the gain in relative capacity is reduced. Here is my simulation of what I am doing at the moment. You can see the average current over the discharge cycle is 80%...
  13. Arouse1973

    Stage Line 500W amp repair project

    Ok I know when I'm not wanted :(. Kris and Bob are far better at explaining things than me. I sometimes forget I am talking to a beginner. But I treat everyone the same so I may use terms you are not familiar with, but I don't know how much or how little you know. I find it better this way, so I...
  14. Arouse1973

    Power banks in parallel to increase A / mAh

    I am doing a test at the moment with two series 2250mA batteries and a buck drawing 25mA. So your saying I should get over 4Ah of capacity then? I let you know how I got on. Adam
  15. Arouse1973

    Faulty 36V switching power supply?

    Your multimeters AC setting is only suitable for measuring mains frequency really, unless its a true rms type. You cant get any meaningful results otherwise. I would be supprised if XP PSUs were actually doing this. I have used many of them over the years without a problem. But I suppose there...
  16. Arouse1973

    Power banks in parallel to increase A / mAh

    You could maybe try putting them in series and use a buck. But you will only have the capacity of one cell. Although initially you would draw less average current from the battery. But as the voltage dropped this would increase and not give you much of a benefit. Adam
  17. Arouse1973

    Voltage from rotation

    Yes maybe they are too far apart now. But hope you can use the formula to now see what makes the most difference. Magnetic flux and number of turns plays a big part in all this. Adam
  18. Arouse1973

    D.I.Y Speakers-Tweeter Problem :-(

    Thanks Adam
  19. Arouse1973

    Voltage from rotation

    Yes. Just try and take out every other magnet. You might find the gain is greater so you won't have to turn faster. You must try these different things to learn don't keep relying on simulation. Practice makes perfect! Adam
  20. Arouse1973

    Voltage from rotation

    Yes I get 1.1 V, if I reduce the loss of flux to only 10% I get 558 mV. One thing to try is to take out every other magnet and see what happens. This will allow for a greater difference in flux loss. You may have to spin it faster though. Adam
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